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Research Article

Variation of Yield and Quality in Early Maturing Rice Cultivars by Transplanting Date in Chungnam Plain Area in Korea

Yeo-Tae Yun1,2, Chong-Tae Chung1, Yeong-Ju Lee1, Han-Jung Na1, Jae-Chul Lee1, Dong-Hee Lee1, Kwang-Won Lee1, Ju-Won Kang2, Sang-Nag Ahn2,*
Plant Breeding and Biotechnology 2015;3(1):47-57.
Published online: March 31, 2015

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*Corresponding author Sang-Nag Ahn, ahnsn@cnu.ac.kr, Tel: +82-42-821-5728, Fax: +82-42-822-2631
• Received: November 19, 2014   • Revised: January 12, 2015   • Accepted: January 27, 2015

Copyright © 2015 The Korean Society of Breeding Science

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Studies were initiated for two consecutive years to examine the effects of transplanting date on the yield and quality of early maturing rice cultivars and to select rice cultivars capable of adapting to early transplanting in the middle plain area. The experiment was laid out in a split-plot design with 3 replications. The main plots consisted of two transplanting dates viz. early (25th of April) and ordinary (25th of May), with sub-plots containing eight cultivars. For early transplanting the mean temperature at the grain filling stage was lower than for ordinary transplanting, while the rice grain quality traits and palatability values were improved. Early transplanting results in 11 days earlier heading, higher head rice yield and lower milled rice yield than ordinary transplanting. Significant differences among the eight cultivars tested in this study were observed for most traits. Among cultivars, ‘Joami’ demonstrated the highest palatability. ‘Joami’ also performed better in head rice ratio and head rice yield than ‘Unkwang’, which is widely cultivated in the middle plain area. Palatability value (PV) showed significant positive correlations with head rice ratio (HR) and amylose content (AC), and negative correlations with chalky rice ratio (CR) and protein content (PC). Mean temperature (MT) was positively correlated with CR and PC, and negatively correlated with HR and AC. The highest positive and negative correlations among the rice quality traits were observed between HR and AC (r = 0.734), and HR and CR (r = −0.944), respectively. Based on the research findings, ‘Joami’ is suitable for early transplanting for cultivation in the Chungnam plain area.
  • Key words: Early maturing rice, Transplanting time, Yield, Quality, High temperature
Early season cultivation of early maturing rice cultivars in plains area is very attractive for many reasons. Farmers can disperse the farm work in other periods and sell the raw rice at a high price before ‘Chuseok’, Korean Thanksgiving Day. In addition, Rice Processing Complexes (RPC) efficiently operates utilities and use the newly harvested rice as a good marketing tool to manage existing customers and pioneer a new market. As of 2011, the early transplanting cultivation area containing early maturing cultivars reached 42,000 ha, accounting for 46% of the total area for early maturing cultivars (Lee et al. 2012). For this reason, RPCs make contracts with farmers to grow early maturing rice cultivars by early season cultivation. However, early maturing rice cultivars which have been bred to grow in mid-mountain and mountainous regions tend to display worse grain appearance and eating quality than late maturing rice cultivars when grown in plains areas, mainly due to the high temperature at the grain filling stage (Choi et al. 1994; Choung et al. 2004).
With improvement of the standard of living, the demand for superior rice grain quality has become a priority issue (Yoshinobu et al. 2007; Hao et al. 2009; Lee et al. 2012). The definition of rice grain quality is complex, involving many components such as appearance, cooking quality and eating quality. Among these properties, consumers often pay more attention to appearance (Guo et al. 2011). Rice grain quality can be affected by genetic and environmental factors, especially temperature at the grain filling stage. High temperature during the grain filling stage causes increase in the occurrence of chalky grain and decrease of the head rice ratio (Lisle et al. 2000; Adoration et al. 1977). The most favorable temperature to produce high quality japonica rice was reported to be about 25°C at the filling stage (Jin et al. 2005). For this reason, early maturing rice cultivars grown in plains areas display bad grain appearance and eating quality compared with those grown in mid-mountain and mountainous regions (Choi et al. 1994; Choung et al. 2004), because they experience higher temperature during the ripening stage. The reason for the decrease in rice quality is that the high temperatures interfere with kernel development and reduce the carbohydrates in the plant during the grain filling stage, leading to a decrease in the head rice ratio as well as the appearance traits (He et al. 1990; Morita 2008; Morita and Nakano 2011).
A number of early maturing rice cultivars have been grown in plains areas for early harvest. Rice grain quality was reported to be different among cultivars tested under high temperatures (Nishimura et al. 2000). ‘Unkwang’, widely grown since 2004 due to its high yield, showed the worst appearance and grain quality among cultivars tested when cultivated in plains areas by early season cultivation (Lee et al. 2008). For these reasons, there is a need to replace Unkwang with other early maturing cultivars with better quality. Although the early maturing cultivars grown in plains areas after late transplanting display similar quality traits compared with medium maturing cultivars (Choi et al. 2005), it is difficult to harvest the rice before ‘Chuseok’ with late transplanting, and it has been used only for double cropping.
Improving the heat tolerance of rice is one way to solve this problem (Morita 2008), and genetic studies have been carried out to examine heat tolerance for the breeding of heat-tolerant cultivars. In Japan, heat-tolerant rice cultivars such as ‘Nikomaru’ (Sakai et al. 2010), ‘Kumasannochikara’ (Fujii et al. 2009), ‘Genkitsukushi’ (Wada et al. 2010) and ‘Akisakari’ (Tanoi et al. 2010) were developed. The heat-tolerant cultivars showed better appearance with lower chalky rice ratio at high temperatures during the ripening stage than other cultivars (Kohei et al. 2009). Early maturing rice cultivars adaptable to plains areas should be tolerant to high temperature during the ripening stage. However, a limited number of studies have investigated the adaptability of early maturing rice cultivars to plains areas, or for tolerance to high temperature in Korea (Choi et al. 2005; Choung et al. 2004; Lee et al. 2008; Lee et al. 2012). The present study was conducted to determine the effects of transplanting date on the yield and quality of early maturing cultivars, and to select the cultivars adaptable to early transplanting in middle plains areas.
Plant materials and field trial
Eight early maturing japonica cultivars were used to evaluate variation in yield and quality traits (Table 1). They were developed between 2000 and 2008, and had close relationships. Three cultivars, ‘Goun’, ‘Joan’, and ‘Odae 1,’ shared ‘Jinbu 10’ as the crossing parent. Seedlings of eight early maturing commercial rice cultivars were raised in greenhouses for 30 days after sowing and then transplanted on the 25th of April and the 25th of May, respectively. A total of 4–5 seedlings were planted per hill, with the spacing of 15 cm between plants and 30 cm between rows, in the experimental field of the Chungcheongnam-do Agricultural Research and Extension Services (CNARES) in 2009 and 2010. A split plot design with three replications was employed with the transplanting date as the main plot, and cultivars as the subplots. In the subplots, seedlings of each cultivar were planted in 7 lines, with 32 plants per line. Fertilizer (N-P2O5-K2O) was applied at the rate of 90-45-57 kg/ha.
Trait evaluation
Nine agronomic traits were investigated according to the standard of research and investigation for agronomic traits (RDA 2003): days to heading (DTH; the number of days from sowing to emergence of 50% of the panicle head); culm length (CL; the distance between the soil surface to the tip of the tallest panicle neck); panicle length (PL; the distance between the panicle neck and panicle tip); panicle number (PN; the number of productive tillers per hill); spikelets per panicle (SPP; the average number of spikelets counted on all panicles of 3 plants); milled rice yield (YD); ripened grain ratio (the average no. of fully ripened grains counted on 3 plants). Yield of milled rice (YD) was measured and calculated as the average weight of bulked grain harvested from 100 plants per line. The YD was corrected for 15% grain moisture content.
Each rice sample was harvested when the accumulated mean temperature reached 1,100°C after heading. After harvesting, rice grains were air-dried until the moisture content reached 15%, and then dehulled to yield brown rice. Each brown rice sample was milled to 92% milling yield by a polishing machine (Toyo, Japan), and then the milled samples were stored in a refrigerator (15°C) to prevent change of quality. Head rice ratio (HR, unbroken and broken translucent grains with at least 3/4 of a whole grain), chalky rice ratio (CR, grains with an opaque, chalky appearance covering at least half of the body of the grain), and the broken and defected rice ratio (damaged and discolored rice) were calculated with an RN-300 automatic rice grader using a sample of 1,000 grains. Protein content (PC) and amylose content (AC) of milled rice was measured with a Grain Analyzer (AN700 Kett, Japan) using 100g milled rice samples. Palatability value (PV) was calculated for 33g samples of milled rice by the Toyo taste meter (MA-90A and 90B, Toyo, Japan), in accordance with the operation manual (TRCM Co., Japan). Meteorological data were collected from the Korean Meteorological Administration homepage (http://www.kma.go.kr), and the mean temperature (MT), diurnal range (DR) and sunshine hours (SH) for 30 days after heading were calculated.
Statistical analysis
Data were analyzed with year, transplanting date and cultivar as the main, subplot and sub-subplot, respectively, using a split-split plot design. ANOVA indicated that F-values for the effect of main-plot and all interaction terms were not significant, so averages of the data for the two years were used in statistical analysis. The t-test, analysis of variance and correlation analysis were performed using SPSS software (Ver. 18.0.0). Phenotypic means of each cultivar were compared using Duncan’s multiple range test.
Meteorological data
The meteorological data for 30 days after heading, according to transplanting time and cultivar, are shown in Table 2. No differences were observed among cultivars for three components. However, there was a significant difference between the two transplantion times. Early transplanting showed a lower mean temperature and diurnal range, with shorter sunshine hours than ordinary transplanting. Mean air temperatures during the growing season in 2009 and 2010, and the average of five years from 2004 to 2008, are shown in Fig. 1. In July and August, the mean temperature for 2009 was lower than 2010, while the mean temperature in 2010 was higher than the five-year average examined.
Variation of agronomic traits
Upon early transplanting, the days to heading was an average of 11 days shorter than ordinary transplanting, with ‘Goun’ and ‘Taebong’ being the earliest among the cultivars tested (Table 3). Culm length and panicle length showed significant differences according to the transplanting date. Those in early transplanting were 7.5 and 0.6 cm shorter, respectively. No differences were observed in the number of panicles and spikelets, and in the grain filling ratios between the two transplanting dates. However, differences among the cultivars were detected for all agronomic traits according to transplanting date. Among the cultivars tested, Unkwang showed the shortest culm and the longest panicle. Long panicles may be associated with large numbers of spikelets and lower grain filling ratios. ‘Goun’ showed the reverse trend of ‘Unkwang,’ while ‘Joami’ had the highest number of panicles among the cultivars.
Grain yield is the most important element in rice production, and is also affected by environmental factors. As shown in Table 4, significant differences were observed in all yields between the two transplanting dates. Milled rice yield was lower for early transplanting than late transplanting. In addition, ‘Unkwang’ recorded the highest milled rice yield, while ‘Goun’ was the lowest in both transplanting. Head rice yield was higher for early transplanting, with differences between the transplanting times. When transplanted early, ‘Joami’ and ‘Joan’ had the highest head rice yield, while ‘Joami’ and ‘Jokwang’ were the highest for the ordinary transplanting time.
Rice appearance traits
Rice appearance quality is the most important trait in rice production because it influences customer selection when buying rice. For example, rice with high head and low defects is considered to be high quality, and the appearance quality can easily be compared by customers in a short time without any equipment. For this reason, RPCs try to improve the head rice ratio, with the penalty of low milling yield. The results of rice appearance traits according to transplanting times and cultivars are summarized in Table 5. Most of the traits showed significant interaction between transplanting time and cultivar. Head rice ratio showed significant differences between the two times, with the early transplanted rice displayed 5.8% more head. ‘Joan’ showed the highest head rice ratio in early transplanting, while ‘Jokwang’ was the highest for the ordinary time. ‘Unkwang’ had the highest proportion of chalky rice among the eight rice cultivars for both transplanting dates.
Physicochemical traits and palatability value
Protein and amylose content of the rice also showed significant differences between the transplanting dates and among the cultivars examined herein (Table 6). The protein content was lower for early transplanting by 0.35%. The highest protein content was observed in ‘Joan’ with the lowest in ‘Junamjosaeng’ for both dates. Amylose content ranged from 18.06% (Unkwang) to 18.61% (Goun). As for the palatability value, ‘Joami’ recorded the highest score among the eight cultivars, while ‘Unkwang’ was the lowest for both transplanting times.
Correlation analysis showed that all traits were significantly correlated with each other (Table 7). PV was positively correlated with HR, AC, DR and SH, but negatively correlated with CR, PC and MT. In addition, MT was positively correlated with CR and PC, but negatively correlated with HR and AC. The highest positive and negative correlations observed among rice the quality traits were between HR and AC (r = 0.734**), and HR and CR (r = −0.944**), respectively. These results suggested that the rice quality traits are dependent on each other, and are affected by environmental factors.
Nowadays, early maturing rice cultivars suitable for growth in mid-mountain and mountainous areas are being cultivated in plains areas to sell new crop rice before ‘Chuseok’, the Korean Thanksgiving Day. The quality of rice grain deteriorates when early maturing rice cultivars are cultivated in plains areas due to the high temperature during the grain filling stage. Yun and Lee (2001) reported that the optimum temperature for the grain filling stage which leads to the production of high quality japonica rice ranged from 21°C to 23°C. The mean temperatures of all rice cultivars tested in this study were over 24.0°C, leading to a high ratio of chalky rice, while ‘Unkwang’ was the highest. Chalky rice is easily broken during milling, and has less stickiness than head rice when cooked, which decreases the palatability. The increase in the ratio of chalky rice might be due to interference with kernel development and reduction in carbohydrates in the plant at the grain filling stage due to the high temperature (Nagata et al. 2004). In addition, high temperature at the grain filling stage influences the physiochemical properties, such as protein and amylose content (Jin et al. 2005; Aboubacar et al. 2006). Several QTL studies reported the colocalization of QTL for heading date and grain quality (Li et al. 2011; Takeuchi et al. 2007, 2008). Nishimura et al. (1985) reported that heading date affected the chemical components such as ADV, and the amylose and protein content, which could affect the eating quality. These results imply a causal relationship between heading date and grain quality, because the heading date might determine the timing of the grain filling stage of each cultivar, which is in turn associated with the grain quality traits. In this study, the mean temperature at grain filling stage was positively correlated with PC, but negatively correlated with amylose content. Jin et al. (2005) evaluated the influence of temperature at the filling stage on the activities of key enzymes related to grain starch synthesis to gain an understanding of how temperature influences the biochemical characteristics, and demonstrated that starch synthesis is dependent on temperature. The activity of SBE (starch branching enzyme) was especially sensitive to temperature, reaching a maximum at 25°C, after which the activity decreased with further rise in temperature. In general, protein content was reported to be negatively correlated with eating quality (Juliano et al. 1965; Ishima et al. 1974), as rice with higher protein content displayed lower adhesiveness and water uptake ratio than that with low protein content, which was also associated with a decrease in the glossiness, taste and stickiness of cooked rice (Yoshinobu et al. 2007; Yanase et al. 1984). The results obtained in the present study also support these observations. Mean temperature during the grain filling stage (MT) for early transplanting was lower than for ordinary transplanting, which may lead to better rice grain quality. MT was negatively correlated with HR and PV, but positively correlated with CR, suggesting that MT clearly affected the rice quality. In addition, early transplanting decreased the number of days to heading by 11 days compared to the ordinary transplanting time, and increased the head rice yield, although the milled rice yield decreased by an average of 21 kg/10a. These results suggest that early transplanting is more advantageous for the production of high quality rice in the middle plains area. Among the 8 rice cultivars tested in this study, ‘Unkwang’ showed the highest yield, but the lowest values for the rice quality traits, including HR, AC and PV. This is likely due to the fact that the rice quality traits were highly correlated with each other.
In conclusion, early maturing cultivars in the middle plains areas had less desirable grain quality at the ordinary transplanting time than at early transplanting, mainly due to high temperatures during the grain filling stage. Varietal differences were observed among the eight cultivars, depending on the transplanting times. Although ‘Joan’ had the highest head rice yield for early transplanting, ‘Joami’ showed the highest palatability value during both times. ‘Joami’ also performed better in head rice ratio, head rice yield and palatability values than ‘Unkwang’. Based on the research findings, ‘Joami’ might be most suitable for early transplanting cultivation in middle plains areas.
This work was supported by the Next-Generation Biogreen 21 Program (Plant Molecular Breeding Center No. PJ008136), Rural Development Administration, Republic of Korea.
Fig. 1
Mean air temperature during the growing season in 2009 and 2010, and the average of five years from 2004 to 2008. Black, gray, and broken lines indicate air temperature in 2009, 2010, and the average of 5 years, respectively. Data were obtained from the website of the Korean Meteorological Administration (http://www.kma.go.kr).
pbb-03-47f1.jpg
Table 1
List of rice cultivars used in this study.
Table 1
Cultivar Line designation Cross combination Year of development
Goun Jinbu 36 Jinbu 10/Jinbu 17 2004
Joami Sangju 36 Sambaeg//Yukara/Tonggae 112 2008
Joan Suweon 478 Jinmibyeo/Jinbu 10 2003
Jokwang Milyang 213 Milyang 187/YR21113-B-B 2007
Junamjosaeng Milyang 208 Milyang 165/Koshikari 2006
Odae 1 Jinbu 37 Ilpumbyeo/Jinbu 10 2005
Taebong Cheolweon 59 SR13330-13-3-5/Jinbubyeo 2000
Unkwang Unbong 30 Sobibyeo/Cheolweon 54 2004
Table 2
Meteorological data for 30 days after heading, by transplanting time and cultivar.
Table 2
Transplanting time Cultivar Heading date Mean temperature (°C) Diurnal range (°C) Sunshine hour (hr)
Early (April 25) Goun July 13 24.3 8.40 129.1
Joami July 18 24.8 8.17 134.4
Joan July 16 24.7 8.03 130.1
Jokwang July 21 24.9 8.50 149.3
Junamjosaeng July 20 24.9 8.43 148.4
Odae 1 July 14 24.7 8.17 130.7
Taebong July 14 24.5 8.30 129.3
Unkwang July 19 24.9 8.50 138.5
Ordinary (May 25) Goun July 25 25.0 8.50 153.2
Joami July 29 25.2 8.57 155.9
Joan July 26 25.1 8.63 159.8
Jokwang July 29 24.9 8.47 150.7
Junamjosaeng July 31 25.1 8.43 153.4
Odae 1 July 25 25.1 8.70 162.1
Taebong July 25 25.0 8.50 154.7
Unkwang July 28 25.1 8.50 153.6
Mean Early July 16 25.8 8.31 137.5
Ordinary July 27 26.1 8.54 155.4
Differencez) - −8.179** −6.012** −3.747**

z) *, **Significantly different between two transplanting times at P= 0.05 and 0.01, respectively.

Table 3
Comparison of agronomic traits and yield components by transplanation time and cultivar.
Table 3
Transplanting time (A) Cultivar (B) Traitz)
Days to heading Culm length (cm) Panicle length (cm) Panicles/hill No. spikelets Ripened Grain ratio (%)
ea/panicle ea/m2 (×1,000)
Early (April 25) Goun 77.6 e 74 a 18.1 c 14.7 bc 72.7 d 25.4 c 91.3 a
Joami 82.8 b 69 ab 18.0 c 19.0 a 69.2 d 31.3 bc 87.5 ab
Joan 81.6 bc 71 ab 19.0 b 14.1 bc 92.4 b 31.0 bc 88.6 ab
Jokwang 85.7 b 66 b 17.9 c 16.0 b 78.9 c 30.0 bc 87.9 ab
Junamjosaeng 85.8 a 70 ab 18.0 c 14.2 bc 82.7 c 27.9 c 91.3 a
Odae 1 79.8 cd 70 ab 19.0 b 11.5 d 97.4 b 26.7 c 91.1 a
Taebong 78.3 de 68 ab 19.6 ab 14.7 bc 91.0 b 31.9 b 85.4 bc
Unkwang 83.2 b 65 b 19.8 a 12.6 cd 112.7 a 33.8 a 82.3 c
Ordinary (May 25) Goun 60.5 g 81 a 18.4 c 14.6 bc 85.3 c 29.6 c 90.9 ab
Joami 64.8 c 77 b 18.3 c 18.4 a 72.8 d 31.9 c 87.0 cd
Joan 62.7 e 81 a 20.5 a 14.3 c 105.6 a 35.9 a 84.6 d
Jokwang 69.7 a 72 c 18.4 c 16.3 b 83.2 c 32.3 bc 91.8 a
Junamjosaeng 66.8 b 76 b 18.2 c 14.6 bc 86.2 c 30.0 c 89.5 abc
Odae 1 61.5 f 80 a 19.4 b 13.0 c 97.6 b 30.2 c 90.7 ab
Taebong 59.8 g 74 c 20.2 a 14.3 c 101.3 ab 34.5 ab 88.4 bc
Unkwang 63.8 d 70 d 20.3 a 14.4 bc 107.5 a 36.8 a 78.9 e
Mean Early 81.8 69.0 18.6 14.6 87.1 30.5 88.2
Ordinary 63.7 76.5 19.2 14.9 92.4 32.8 87.7
Differencey) 20.3** −6.5** −2.045* ns ns −2.521* ns
Interaction A × B 5.481** ns ns ns 5.243** ns ns

z)Means with the same letters in a column for each transplanting date are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 4
Milled and head rice yield by transplanting date and cultivar.
Table 4
Transplanting time (A) Cultivar (B) Milled rice yieldz) (kg/10a) Yield index of milled rice Head rice yieldz) (kg/10a) Yield index of head rice
Early (April 25) Goun 461 d 81 386 d 93
Joami 529 b 93 451 ab 108
Joan 525 b 92 470 a 113
Jokwang 509 cb 89 413 c 99
Junamjosaeng 501 cb 88 410 c 99
Odae 1 480 c 84 411 c 99
Taebong 506 cb 89 432 bc 104
Unkwang 569 a 100 416 c 100
Ordinary (May 25) Goun 488 e 83 388 d 97
Joami 546 b 93 429 ab 107
Joan 537 bc 91 399 cd 100
Jokwang 528 c 89 441 a 110
Junamjosaeng 506 d 86 414 bc 103
Odae 1 509 d 86 396 cd 99
Taebong 540 bc 92 410 bcd 102
Unkwang 590 a 100 401 cd 100
Mean Early 509 89.5 423 101.9
Ordinary 530 90.0 409 102.3
Differencey) −2.173* - 2.475* -
Interaction A × B ns - 4.655** -

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 5
Rice appearance traits by transplanting time and cultivar.
Table 5
Transplanting Time (A) Cultivar (B) Rice Appearance Traitsz)
Head (%) Chalky (%) Broken (%) Defect (%)
Early (April 25) Goun 84.2 bc 4.6 f 9.4 a 1.8
Joami 85.4 b 9.5 bcd 3.7 cd 1.4
Joan 89.8 a 5.7 ef 3.1 d 1.4
Jokwang 80.6 c 10.1 bc 7.5 ab 1.8
Junamjosaeng 82.3 bc 12.2 b 4.6 cd 0.9
Odae 1 85.6 b 8.3 cde 4.3 cd 1.8
Taebong 85.5 b 6.8 def 4.9 bcd 2.8
Unkwang 73.1 d 19.5 a 5.7 c 1.7
Ordinary (May 25) Goun 79.3 bc 12.5 d 4.3 ab 3.9 b
Joami 78.5 bc 17.5 c 2.7 c 1.3 c
Joan 74.4 d 21.3 b 2.8 bc 1.5 c
Jokwang 83.6 a 12.4 d 2.4 c 1.6 c
Junamjosaeng 82.1 ab 13.4 d 3.3 bc 1.2 c
Odae 1 78.0 cd 16.7 c 3.9 b 1.4 c
Taebong 76.0 cd 15.5 cd 3.7 bc 4.8 a
Unkwang 68.1 e 25.4 a 5.5 a 1.0
Mean Early 83.3 9.6 5.4 1.7
Ordinary 77.5 16.8 3.6 2.1
Differencey) 4.026** 5.302** 3.495** ns
Interaction A × B 10.209** 9.172** 14.107** ns

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 6
Physicochemical traits and Palatability value by transplanting date and cultivar.
Table 6
Transplanting date (A) Cultivar (B) Traitsz)
Protein (%) Amylose (%) Palatability value
Early (April 25) Goun 6.62 a 18.61 a 64.7 d
Joami 6.27 ab 18.43 cd 74.1 a
Joan 6.52 a 18.61 a 68.9 bc
Jokwang 5.91 bc 18.45 bcd 65.6 cd
Junamjosaeng 5.76 c 18.56 abc 69.8 b
Odae-1 6.74 a 18.58 ab 67.1 bcd
Taebong 6.70 a 18.57 abc 63.8 d
Unkwang 5.93 bc 18.35 d 63.5 d
Ordinary (May 25) Goun 6.53 cd 18.60 a 65.5 bc
Joami 6.62 c 18.40 b 70.0 a
Joan 7.20 a 18.35 b 63.1 d
Jokwang 6.28 e 18.48 ab 65.1 c
Junamjosaeng 6.33 de 18.43 b 66.8 b
Odae-1 7.04 ab 18.41 b 67.1 b
Taebong 6.93 b 18.46 b 62.3 d
Unkwang 6.37 de 18.06 c 60.5 e
Mean Early 6.31 18.52 67.2
Noraml 6.66 18.40 65.1
Differencey) −3.290** 2.149* 2.141*
Interaction A × B 3.69** 4.97** 4.66**

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 7
Correlation coefficients among rice quality traits and environmental factors.
Table 7
Trait HR CR PC AC PV MT DR
CR −0.94**
PC −0.35** 0.40**
AC 0.73** −0.78** −0.39**
PV 0.56** −0.56** −0.38** 0.43**
MT −0.65** 0.72** 0.51** −0.77** −0.37**
DR 0.58** −0.59** −0.34** 0.46** 0.25* −0.76**
SH 0.48** −0.46** −0.31** 0.43** 0.24* −0.67** 0.94**
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Variation of Yield and Quality in Early Maturing Rice Cultivars by Transplanting Date in Chungnam Plain Area in Korea
Plant Breed. Biotech.. 2015;3(1):47-57.   Published online March 31, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.1.047
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Variation of Yield and Quality in Early Maturing Rice Cultivars by Transplanting Date in Chungnam Plain Area in Korea
Plant Breed. Biotech.. 2015;3(1):47-57.   Published online March 31, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.1.047
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Variation of Yield and Quality in Early Maturing Rice Cultivars by Transplanting Date in Chungnam Plain Area in Korea
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Fig. 1 Mean air temperature during the growing season in 2009 and 2010, and the average of five years from 2004 to 2008. Black, gray, and broken lines indicate air temperature in 2009, 2010, and the average of 5 years, respectively. Data were obtained from the website of the Korean Meteorological Administration (http://www.kma.go.kr).

Fig. 1

Variation of Yield and Quality in Early Maturing Rice Cultivars by Transplanting Date in Chungnam Plain Area in Korea

List of rice cultivars used in this study.

Cultivar Line designation Cross combination Year of development
Goun Jinbu 36 Jinbu 10/Jinbu 17 2004
Joami Sangju 36 Sambaeg//Yukara/Tonggae 112 2008
Joan Suweon 478 Jinmibyeo/Jinbu 10 2003
Jokwang Milyang 213 Milyang 187/YR21113-B-B 2007
Junamjosaeng Milyang 208 Milyang 165/Koshikari 2006
Odae 1 Jinbu 37 Ilpumbyeo/Jinbu 10 2005
Taebong Cheolweon 59 SR13330-13-3-5/Jinbubyeo 2000
Unkwang Unbong 30 Sobibyeo/Cheolweon 54 2004

Meteorological data for 30 days after heading, by transplanting time and cultivar.

Transplanting time Cultivar Heading date Mean temperature (°C) Diurnal range (°C) Sunshine hour (hr)
Early (April 25) Goun July 13 24.3 8.40 129.1
Joami July 18 24.8 8.17 134.4
Joan July 16 24.7 8.03 130.1
Jokwang July 21 24.9 8.50 149.3
Junamjosaeng July 20 24.9 8.43 148.4
Odae 1 July 14 24.7 8.17 130.7
Taebong July 14 24.5 8.30 129.3
Unkwang July 19 24.9 8.50 138.5
Ordinary (May 25) Goun July 25 25.0 8.50 153.2
Joami July 29 25.2 8.57 155.9
Joan July 26 25.1 8.63 159.8
Jokwang July 29 24.9 8.47 150.7
Junamjosaeng July 31 25.1 8.43 153.4
Odae 1 July 25 25.1 8.70 162.1
Taebong July 25 25.0 8.50 154.7
Unkwang July 28 25.1 8.50 153.6
Mean Early July 16 25.8 8.31 137.5
Ordinary July 27 26.1 8.54 155.4
Differencez) - −8.179** −6.012** −3.747**

z) *, **Significantly different between two transplanting times at P= 0.05 and 0.01, respectively.

Comparison of agronomic traits and yield components by transplanation time and cultivar.

Transplanting time (A) Cultivar (B) Traitz)
Days to heading Culm length (cm) Panicle length (cm) Panicles/hill No. spikelets Ripened Grain ratio (%)
ea/panicle ea/m2 (×1,000)
Early (April 25) Goun 77.6 e 74 a 18.1 c 14.7 bc 72.7 d 25.4 c 91.3 a
Joami 82.8 b 69 ab 18.0 c 19.0 a 69.2 d 31.3 bc 87.5 ab
Joan 81.6 bc 71 ab 19.0 b 14.1 bc 92.4 b 31.0 bc 88.6 ab
Jokwang 85.7 b 66 b 17.9 c 16.0 b 78.9 c 30.0 bc 87.9 ab
Junamjosaeng 85.8 a 70 ab 18.0 c 14.2 bc 82.7 c 27.9 c 91.3 a
Odae 1 79.8 cd 70 ab 19.0 b 11.5 d 97.4 b 26.7 c 91.1 a
Taebong 78.3 de 68 ab 19.6 ab 14.7 bc 91.0 b 31.9 b 85.4 bc
Unkwang 83.2 b 65 b 19.8 a 12.6 cd 112.7 a 33.8 a 82.3 c
Ordinary (May 25) Goun 60.5 g 81 a 18.4 c 14.6 bc 85.3 c 29.6 c 90.9 ab
Joami 64.8 c 77 b 18.3 c 18.4 a 72.8 d 31.9 c 87.0 cd
Joan 62.7 e 81 a 20.5 a 14.3 c 105.6 a 35.9 a 84.6 d
Jokwang 69.7 a 72 c 18.4 c 16.3 b 83.2 c 32.3 bc 91.8 a
Junamjosaeng 66.8 b 76 b 18.2 c 14.6 bc 86.2 c 30.0 c 89.5 abc
Odae 1 61.5 f 80 a 19.4 b 13.0 c 97.6 b 30.2 c 90.7 ab
Taebong 59.8 g 74 c 20.2 a 14.3 c 101.3 ab 34.5 ab 88.4 bc
Unkwang 63.8 d 70 d 20.3 a 14.4 bc 107.5 a 36.8 a 78.9 e
Mean Early 81.8 69.0 18.6 14.6 87.1 30.5 88.2
Ordinary 63.7 76.5 19.2 14.9 92.4 32.8 87.7
Differencey) 20.3** −6.5** −2.045* ns ns −2.521* ns
Interaction A × B 5.481** ns ns ns 5.243** ns ns

z)Means with the same letters in a column for each transplanting date are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Milled and head rice yield by transplanting date and cultivar.

Transplanting time (A) Cultivar (B) Milled rice yieldz) (kg/10a) Yield index of milled rice Head rice yieldz) (kg/10a) Yield index of head rice
Early (April 25) Goun 461 d 81 386 d 93
Joami 529 b 93 451 ab 108
Joan 525 b 92 470 a 113
Jokwang 509 cb 89 413 c 99
Junamjosaeng 501 cb 88 410 c 99
Odae 1 480 c 84 411 c 99
Taebong 506 cb 89 432 bc 104
Unkwang 569 a 100 416 c 100
Ordinary (May 25) Goun 488 e 83 388 d 97
Joami 546 b 93 429 ab 107
Joan 537 bc 91 399 cd 100
Jokwang 528 c 89 441 a 110
Junamjosaeng 506 d 86 414 bc 103
Odae 1 509 d 86 396 cd 99
Taebong 540 bc 92 410 bcd 102
Unkwang 590 a 100 401 cd 100
Mean Early 509 89.5 423 101.9
Ordinary 530 90.0 409 102.3
Differencey) −2.173* - 2.475* -
Interaction A × B ns - 4.655** -

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Rice appearance traits by transplanting time and cultivar.

Transplanting Time (A) Cultivar (B) Rice Appearance Traitsz)
Head (%) Chalky (%) Broken (%) Defect (%)
Early (April 25) Goun 84.2 bc 4.6 f 9.4 a 1.8
Joami 85.4 b 9.5 bcd 3.7 cd 1.4
Joan 89.8 a 5.7 ef 3.1 d 1.4
Jokwang 80.6 c 10.1 bc 7.5 ab 1.8
Junamjosaeng 82.3 bc 12.2 b 4.6 cd 0.9
Odae 1 85.6 b 8.3 cde 4.3 cd 1.8
Taebong 85.5 b 6.8 def 4.9 bcd 2.8
Unkwang 73.1 d 19.5 a 5.7 c 1.7
Ordinary (May 25) Goun 79.3 bc 12.5 d 4.3 ab 3.9 b
Joami 78.5 bc 17.5 c 2.7 c 1.3 c
Joan 74.4 d 21.3 b 2.8 bc 1.5 c
Jokwang 83.6 a 12.4 d 2.4 c 1.6 c
Junamjosaeng 82.1 ab 13.4 d 3.3 bc 1.2 c
Odae 1 78.0 cd 16.7 c 3.9 b 1.4 c
Taebong 76.0 cd 15.5 cd 3.7 bc 4.8 a
Unkwang 68.1 e 25.4 a 5.5 a 1.0
Mean Early 83.3 9.6 5.4 1.7
Ordinary 77.5 16.8 3.6 2.1
Differencey) 4.026** 5.302** 3.495** ns
Interaction A × B 10.209** 9.172** 14.107** ns

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Physicochemical traits and Palatability value by transplanting date and cultivar.

Transplanting date (A) Cultivar (B) Traitsz)
Protein (%) Amylose (%) Palatability value
Early (April 25) Goun 6.62 a 18.61 a 64.7 d
Joami 6.27 ab 18.43 cd 74.1 a
Joan 6.52 a 18.61 a 68.9 bc
Jokwang 5.91 bc 18.45 bcd 65.6 cd
Junamjosaeng 5.76 c 18.56 abc 69.8 b
Odae-1 6.74 a 18.58 ab 67.1 bcd
Taebong 6.70 a 18.57 abc 63.8 d
Unkwang 5.93 bc 18.35 d 63.5 d
Ordinary (May 25) Goun 6.53 cd 18.60 a 65.5 bc
Joami 6.62 c 18.40 b 70.0 a
Joan 7.20 a 18.35 b 63.1 d
Jokwang 6.28 e 18.48 ab 65.1 c
Junamjosaeng 6.33 de 18.43 b 66.8 b
Odae-1 7.04 ab 18.41 b 67.1 b
Taebong 6.93 b 18.46 b 62.3 d
Unkwang 6.37 de 18.06 c 60.5 e
Mean Early 6.31 18.52 67.2
Noraml 6.66 18.40 65.1
Differencey) −3.290** 2.149* 2.141*
Interaction A × B 3.69** 4.97** 4.66**

z)Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

y)*, **Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Correlation coefficients among rice quality traits and environmental factors.

Trait HR CR PC AC PV MT DR
CR −0.94**
PC −0.35** 0.40**
AC 0.73** −0.78** −0.39**
PV 0.56** −0.56** −0.38** 0.43**
MT −0.65** 0.72** 0.51** −0.77** −0.37**
DR 0.58** −0.59** −0.34** 0.46** 0.25* −0.76**
SH 0.48** −0.46** −0.31** 0.43** 0.24* −0.67** 0.94**
Table 1 List of rice cultivars used in this study.
Table 2 Meteorological data for 30 days after heading, by transplanting time and cultivar.

Significantly different between two transplanting times at P= 0.05 and 0.01, respectively.

Table 3 Comparison of agronomic traits and yield components by transplanation time and cultivar.

Means with the same letters in a column for each transplanting date are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 4 Milled and head rice yield by transplanting date and cultivar.

Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 5 Rice appearance traits by transplanting time and cultivar.

Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 6 Physicochemical traits and Palatability value by transplanting date and cultivar.

Means with the same letter in a column are not significantly different at the 5% level, as determined by Duncan’s multiple range test.

Significantly different between two transplanting times at 0.05 and 0.01, respectively.

Table 7 Correlation coefficients among rice quality traits and environmental factors.

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

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