Glutinous rice is a key grain quality trait occupying an important part during rice processing in most rice growing areas. In this study, a gene pyramiding approach was used to introduce two dull genes, responsible for low amylose content, for glutinous rice breeding using marker assisted selection (MAS). The genotyping results revealed that rice cultivar Milyang319 carries both dull genes on chromosome 6, derived from cv. Milky-queen (Wx-mq) and cv. LGS-soft (du12(t)), respectively. Milyang319 had a significantly low amylose content (9.0%) compared to those observed in donor parents Milky-queen (15.7%) and LGS-soft (14.5%). In addition, the amylogram analysis of Milyang319 showed a similar pattern of glutinous rice. Originally, Milyang319 had a low hardness and more stickiness compared to those recorded in cooked rice of both dull parental lines. Therefore, Milyang319 is proposed as a promising candidate rice cultivar that could be used as a new source of waxy germplasms with same physicochemical features of glutinous rice in further breeding programs.

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Biofortification is a cost-effective method for increasing the availability of micronutrients. Rice breeding for high levels of micronutrients is one of the best approaches to solve the problem of malnutrition. In this study, we developed a doubled haploid (DH) population derived from a cross between the rice cultivars 93-11 and Milyang 352 and evaluated QTLs for grain micronutrients and grain shape. Two co-localized QTLs, qFe3-1 and qZn3-1, were identified in the interval between ah03002520 and cmb0336.5 on chromosome 3, which explained 17.6% and 10.5% of the phenotypic variation, respectively. Correlation analysis between agronomic and micronutrient traits showed positive correlations between grain Fe and Zn contents but a negative correlation between grain Fe content and length-to-width ratio. This indicated the possibility of simultaneously increasing both Fe and Zn content in rice grains for improving the micronutrient profile of rice. We selected some promising lines by recombinant selection using linked markers on chromosome 3. The co-localized QTLs qFe3-1 and qZn3-1 might be useful for the improvement of biofortified rice breeding by marker-assisted selection and gene pyramiding.

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• Precision breeding strategy to enrich iron and zinc in rice
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Panicle blast is a serious disease in rice production in Korea. To develop rice cultivar resistant to panicle blast, the Pb1 gene, originating in the indica cultivar ‘Modan’, was incorporated into an elite japonica cultivar ‘Ilmi’, which is highly susceptible to panicle blast, by marker assisted backcross breeding. ‘Hwayeong’ was selected as the donor parent for the Pb1 gene based on 10 years of panicle blast data. The inheritance of panicle blast resistance in ‘Hwayeong’ is controlled by a single dominant gene. This panicle blast resistance gene, Pb1, from ‘Hwayeong’ was incorporated into the susceptible variety, ‘Ilmi’, by marker assisted backcross approach using DNA marker RM206. As a result, ‘Saeilmi’ containing the Pb1 gene showed resistance to panicle blast. The agronomical and grain quality traits of ‘Saeilmi’ were similar to those of the recurrent parent ‘Ilmi’. Molecular background analysis revealed that ‘Saeilmi’ had the least donor segment introgression in the locus of the Pb1 gene on chromosome 11.

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