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Research Article

Inheritance of Resistance to Race 5 of Powdery Mildew Fungus Podosphaera xanthii in Melon and Development of Race 5-Specific High Resolution Melting Markers

Jeong-Eui Hong1, Mohammad Rashed Hossain2, Hee-Jeong Jung1, Ill-Sup Nou1,*
Plant Breeding and Biotechnology 2022;10(4):272-281.
Published online: December 1, 2022

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*Corresponding author Ill-Sup Nou, nis@sunchon.ac.kr, Tel: +82-61-750-3249, Fax: +82-61-750-3208
• Received: November 2, 2022   • Revised: November 17, 2022   • Accepted: November 21, 2022

Copyright © 2022 by the Korean Society of Breeding Science

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  • Powdery mildew (PM), caused by the biotrophic fungus Podosphaera xanthii, drastically reduces the yield and quality of melon (Cucumis melo L.). Knowledge of the genetic control and high throughput molecular markers linked with resistance against this disease are essential for breeding programs. The bioassay study of the F1 and F2 populations derived from the parents, ‘PMR 5’ (♂) and ‘SCNU1154’ (♀) revealed a monogenic dominant nature of resistance to the devastating race, race 5. Besides, we developed three SNP based high resolution melting markers, PMm-HRM-1, PMm-HRM-2, and PMm-HRM-3, based on the previously identified SNPs on chromosome 12 and validated them using 8 melon lines and 137 F2 populations. Among these, the SNP of marker PMm-HRM-1 causes a missense mutation in the LRR region of MELO3C002393 and we were able to distinguish the resistant vs susceptible genotypes from eight diverse melon accessions and the segregating F2 population with more than 90% genotyping efficiency. The other two markers were based on intergenic SNPs and had more than 80% genotyping efficiency in F2 population. These markers will be helpful to melon breeders to develop melon cultivars resistant to P. xanthii race 5 via marker assisted breeding programs.
  • Key words: Melon, Powdery mildew, Race 5, SNP, HRM, MAS 
Melon (Cucumis melo L.) is a fruit crop of Cucurbitaceae family that is widely grown across the world in both temperate and tropical regions due to its high flavor, taste, and nutritional value (Fernández‐Trujillo et al. 2011). Melon fruit contains important nutritional compounds, including sugar, vitamins, minerals, and antioxidants that play significant roles in human health (Lester 2008). The average production of melon is more than 33 million tons per year (FAOstat 2018). Every year, almost 25% of crops are lost owing to diseases caused by fungal, bacterial, viral, and insect pests (Agrios 1997).
Powdery mildew (PM) is one of the most devastating and widespread diseases of Cucurbitaceae vegetables, caused by two biotrophic fungi, Podosphaera xanthii or Golovinomyces cichoracearum, of which the former one has been reported in Korea (Lee et al. 2014; Kim et al. 2016a; Kim et al. 2016b). Among the twenty-eight reported races of P. xanthii that cause powdery mildew in melon (McCreight 2006), races 1, 2, and 3 are prevalent in America, and races 0, 4, and 5 were identified in France (Bardin et al. 1999). Previous studies characterized races 1, N1, N2, and 5 that cause powdery mildew in melon (Hosoya et al. 1999) and later, seven different races (races 1, 2, 3, 4, 5, 6, and 7) have been reported (Kuzuya et al. 2004) followed by a new race, N5 in Japan (Kim et al. 2016b). Two new races, KN1 and KN2, have recently been identified in South Korea as causing severe disease on melon (Kim et al. 2016a; Kim et al. 2016b; Hong et al. 2018). Despite moderate success in controlling P. xanthii with agrochemicals, cost effectiveness, pathogenic resis-tance to fungicides as a result of long-term use, and environmental hazard are major concerns. This can be addressed by the development of resistance cultivars. However, for race 5, molecular markers and elite cultivars have yet to be reported.
In melon, twelve major quantitative trait loci (QTLs) associated with resistance to different races of powdery mildew have been identified (Liu et al. 2010). In addition, many powdery mildew studies have been reported in melon (Li et al. 2017). Genes and QTLs conferring resistance to powdery mildew have been reported on chromosomes 2, 5, and 12 (Ning et al. 2014). Among them, Pm-R1-2 were against race 1 and Pm-R5 on LG V was against race 5 in the TGR-1551 line (Yuste‐Lisbona et al. 2010). Using simple sequence repeat (SSR) markers, the QTL PmV.1 against races 1, 2, and 3 and QTL PmXII.1 against races 1, 2, and 5 on LG XII was identified in PI 124112 (Perchepied et al. 2005).
Resistant (R) genes play important roles in resistance to plant disease (Ellis et al. 2000; Harris et al. 2013). R genes have been identified in several plant species, including Arabidopsis thaliana, Oryza sativa, and Cucumis sativus (Meyers et al. 2003; Monosi et al. 2004; Wan et al. 2013). R genes are reliable candidate genes for disease resistance that can be easily converted into molecular markers through the use of SSRs, single nucleotide polymorphisms (SNPs), and insertion/deletions (InDels). Molecular markers have been instrumental in the selection of disease-resistant cultivars and accelerating breeding cycles. Among the many molecular marker methods, HRM analysis is a closed-tube method for measuring the fluorescence reduc-tion of intercalating dye during the dissociation of double- stranded DNA (Vossen et al. 2009). HRM markers have been developed as a quick, accurate, and high throughput marker for plant trait, disease diagnostics, and SNP genoty-ping (Chatzidimopoulos et al. 2014; Chatzidimopoulos et al. 2019) Furthermore, this analysis has been widely used to study genetic diversity in several plant species using mole-cular markers such as SNPs and InDels (Mackay et al. 2008; Ganopoulos et al. 2011; Distefano et al. 2012). There are few high throughput molecular markers for powdery mildew. We previously reported race 5-specific SNPs from whole-genome re-sequencing (WGR) on chromosomes 2, 5, and 12 and developed dCAPs markers based on three SNPs on chromosome 12 (Natarajan et al. 2016; Howlader et al. 2020). We converted these SNPs into HRM because HRM marker facilitate mass screening and is high throughput marker. Besides, the inheritance of resistance to P. xanthii race 5 has not been investigated yet. In this study, we therefore aimed to determine the inheritance pattern of resistance to P. xanthii race 5 in melon and develop high throughput HRM markers.
Plant materials and growth conditions
The melon parental lines, ‘PMR 5’ (♂) and ‘SCNU1154’ (♀), resistant and susceptible to Podosphaera xanthii race 5, respectively, were used to develop F1 and F2 generations. Besides, the susceptible lines (susceptible to P. xanthii race 5) Edisto, WMR29, PMR 45, and NSL 74171; and resistant lines MR1, PI 414723, PI 124112, and NSL 86629 were used to validate the developed markers. All the seeds were obtained from the Department of Horticulture, Sunchon National University, Korea (Kim et al. 2016a; Kim et al. 2016b). Plants were grown in a plant culture chamber at 25 ± 2℃ and 60% relative humidity under long-day conditions (14 hours light and 10 hours dark cycle / 80-120 mmol∙m‒2∙s‒1 PPFD).
Powdery mildew culture and inoculation
P. xanthii race 5 was obtained from the Department of Horticulture, Sunchon National University, Korea (Kim et al. 2015) and was cultured on melon leaves in petri dishes on agar medium (Agar powder 6 g.L-1, Saccharose 10 g.L-1, D-Mannitol 20 g.L-1) and cultured fresh leaves were maintained in a plant culture chamber. Melon plants were inoculated with P. xanthii race 5 when the third true leaf was fully open by hand using a spray bottle with a spore concentration of 5 × 105 spore/mL, whereas control plants were sprayed with plain water. To maintain over 95% humidity, inoculated plants were covered with a plastic cover.
Assessment of P. xanthii race 5 resistance and statistical analysis
Inoculated leaves evaluated the disease symptoms at two weeks after inoculation (WAI). The plants were considered P. xanthii race 5-susceptible when the white spores of PM covered more than 10% of the overall melon leaves (Fig. 1). A chi-square (x2) test for goodness-of-fit was used in the XLSTAT software (Addinsoft, New York, USA) to dete-rmine deviations of observed data from expected segre-gation ratios. Heat map was constructed through Heatmapper (http://www.heatmapper.ca/; accessed March 9, 2022).
Extraction of genomic DNA and high resolution melting analysis
Genomic DNA (gDNA) was extracted from young leaves of ten melon plants using DNeasy Plant Mini Kit (QIAZEN, Hilden, Germany) according to the manufacturer’s instructions. The concentration and quality of total gDNA were determined using an ND-1000 Micro-spectrophotometer (NanoDrop Technologies Inc., Wilmington, DE, USA). High resolution melting (HRM) analysis combined with 3’-blocked and unlabeled oligonucleotide probe (HybProbe) specific to the SNP site was used to detect SNPs. The Primers used in this study were synthesized by Macrogen, Seoul, Korea (Table 1). The gDNA was then used for HRM analysis with a LightCycler 96 instrument (Roche, Mannheim, Germany). HRM was performed in 10 mL reaction mixtures containing 1 mL at 5ng/mL, 0.1 mL forward primer, 0.5 mL reverse primer, 0.5 mL probe (10 pmol), 0.3 mL SYTO 9 fluorescent dye (Invitrogen, Thermo Fisher Scientific, USA), 5 mL HS prime LP premix (GENETBIO, Daejeon, Korea), and 2.6 mL DDW. HRM conditions were as follows: an initial preincubation at 95℃ for 300 s; followed by 40 cycle of 3 step amplification (95℃ for 10 seconds, 64℃ to 56℃ for 15 seconds under touch down and 72℃ for 15 seconds); four readings per ℃ at the final step after 60 seconds at 95℃, 60 seconds at 40℃, and 1 second at 97℃. HRM data was performed using LightCycler 96 software at 100% discrimination for delta Tm and curve shape with a 0.2 positive/negative threshold level.
Inheritance of resistance to P. xanthii race 5 in melon
To determine whether the resistance trait to P. xanthii race 5 is dominant or recessive, we used SCNU1154, PMR 5, and F1 (PMR 5 × SCNU1154) generations. The suscep-tible parental line, SCNU1154, had more than 50% PM infected leaf area, while less than 10% of the leaf area was affected in resistant parental line, PMR 5 (Fig. 2) by P. xanthii race 5. Furthermore, bioassay results revealed that the F1 (SCNU1154 × PMR 5) populations had less than 10% infected leaf area, indicating that resistance to P. xanthii race 5 is inherited as a dominant trait. An F2 population derived from a cross between the race 5-susceptbile melon line, SCNU1154 and -resistant line, PMR 5, to investigate the inheritance pattern of P. xanthii race 5 resistance in melon. Among the 137 P. xanthii race 5 inoculated F2 plants, 104 plants showed resistance and 33 plants showed susceptible reactions (Table 2). A chi-square (x2) test revealed that resistance to P. xanthii race 5 seg-regates at a 3:1 (resistant: susceptible) ratio. These results suggest that a single dominant gene is involved in P. xanthii race 5 resistance.
Development of SNP markers using the HRM method
The identification of genes related to P. xanthii race 5-resistant was necessary for the development of P. xanthii race 5-resistant melon cultivars. Our research group recently reported potential candidates for three SNPs in P. xanthii race 5 resistance genes on chromosome 12 (Table 3) (Natarajan et al. 2016; Howlader et al. 2020). However, these SNPs were validated only in melon PI accessions. Therefore, we developed three HRM markers, namely PMm-HRM-1, PMm-HRM-2, and PMm-HRM-3, using the PMR 5, SCNU1154, and F1 generations to validate these three SNPs (Table 1 and Fig. 3). These genotypic polymorphisms of HRM markers were consistent with P. xanthii race 5 resistance phenotypes. Therefore, HRM mar-kers can be used to identify P. xanthii race 5 resistance.
Validation of the HRM markers
To validate the association of three HRM markers, PMm-HRM-1, PMm-HRM-2, and PMm-HRM-3 with resistance to P. xanthii race 5, we used eight diverse melon accessions (Supplementary Fig. 3 and Supplementary Table 1) and 137 F2 populations (Supplementary Table 2). Among the eight diverse melon accessions, the HRM markers, PMm-HRM-2 and PMm-HRM-3 success-fully distinguished resistance vs susceptible genotypes of all, while the geno-typing of the marker, PMm-HRM-1 was miss-matched for only two genotypes (PI 124112 and NSL 86629) (Supplementary Fig. 2 and Supplementary Table 1). However, the genotypes Edisto, WMR29, PMR45, and NSL 74171 showed diffe-rent melting curve peaks for the marker PMm-HRM-3 (Supplementary Fig. 3), which could be due to genetic differences of these two genotypes with other genotypes. HRM assay of the 137 F2 individuals also indicated high detection (of resistance status) accuracy of 90.07%, 87.23%, and 82.27% for the developed markers, PMm-HRM-1, PMm-HRM-2, and PMm-HRM-3, respectively. High cor-relations between the phenotypic and genotypic assays with the diverse melon genotypes and 137 segregating F2 individuals indicate the close linkage of these three SNPs, SNPR5-119, SNPR5-120, and SNPR5-121, with P. xanthii race 5 resistance in melon (Supplementary Table 2).
The use of molecular markers to select disease resistance genotypes has more advantages than traditional phenotypic screening. Target genes and disease-resistant chromosomal regions, or QTLs, can be identified using molecular markers linked to specific phenotypic traits (Tanksley et al. 1989). SNPs are biallelic in nature and stable in most genomes because they are less susceptible to mutations than SSRs (Kota et al. 2003). Furthermore, polymorphism of SSR markers in biological studies, particularly in fungal systems, is a critical constraint (Mahfooz et al. 2016). SNPs can either regulate a phenotype directly or be linked to a phenotype as a result of linkage disequilibrium. As a result, SNPs could be used to create a more accurate high-density genetic map (Li et al. 2015; Kessuwan et al. 2016).
The yield and quality of melon are significantly reduced by many races of the powdery mildew (PM) fungus P. xanthii; on the other hand, some cultivars show resistance to specific P. xanthii races (McCreight 2006; Kim et al. 2016a; Kim et al. 2016b; Lebeda et al. 2016). To under-stand the PM resistance response, an interaction between the plant and the pathogenic P. xanthii race is necessary. The development of melon cultivars with a gene for resistance specific to each P. xanthii race may aid in the explanation of the pathogenesis of PM races and the interactions between genes and races (Fukino et al. 2008). Therefore, the development of P. xanthii race-specific SNP markers that are strongly associated with this desirable trait could be a useful tool for marker-assisted selection (MAS) in melon breeding programs.
We investigated the inheritance pattern of resistance to PM against a widespread P. xanthii race 5 and developed high throughput molecular markers for selecting resistant lines. In our bioassay after inoculation with P. xanthii race 5, the F1 populations from a cross between P. xanthii race 5-susceptbile (SCNU1154) and -resistant (PMR 5) lines were resistant, indicating the dominant nature of resistance to PM (Fig. 3 and Table 2). A phenotypic ratio of 3:1 (resistant: susceptible) was found in 137 F2 plants, indicating a monogenic trait of resistance to P. xanthii race 5 (Supplementary Table 2). Various patterns of inheritance of resistance to powdery mildew in melon have been previously identified, including polygenic against race N1 (Kim et al. 2016b), co-dominant against races 1, 2 and 5 (Yuste-Lisbona et al. 2011), and dominant against races 1 and pxCh1 (Fukino et al. 2008; Liu et al. 2010). Develop-ment of markers, especially the high throughput ones, is essential for mass screening and speed breeding these days (Thomson 2014; Watson et al. 2018; Wanga et al. 2021). Several SSR markers: CMBR150 and CMBR111 (Fukino et al. 2008), CMN1-38 (Fukino et al. 2007), CMBR120 (Kim et al. 2016b), and TJ29 (Gonzalo et al. 2005) CMCT170b and CMMS30-3 (ÜNLÜ et al. 2022); SRAP marker: Pm-8 (Liu et al. 2010) and CAPs markers: CAPS- Dde I (Zhang et al. 2013), and PM2-CAPS and PM5-CAPS (Yuste-Lisbona et al. 2011) were linked with linked to PM resistance against specific races (Cui et al. 2022). These markers were mainly used to develop linkage maps and are of low throughput. These days, SNPs can easily be iden-tified and SNPs linked with specific phenotypic expres-sions can be used for developing high throughput geno-typing upon validation in diverse natural populations and in developed segregating populations (Mammadov et al. 2012; He et al. 2014; Thomson 2014; Yang et al. 2015).
Based on the whole genome re-sequencing of PM susceptible genotype, SCNU1154 and resistant genotypes, MR-1, and PMR 5, we have identified the genome-wide SNPs, of which 112 SNPs and 12 InDels were observed in powdery mildew responsive chromosomes 2, 5, and 12 (Natarajan et al. 2016; Howlader et al. 2020). Among these, three polymorphic SNPs, namely, SNPR5-119, SNPR5-120, and SNPR5-121 demonstrated race 5‑specific genetic varia-tion in melon (Kim et al. 2016a; Kim et al. 2016b). Among these, three SNPs, namely, SNPR5_119, SNPR5_120, and SNPR5_121 on chromosome 12 (closely located to the SSR marker CMBR150) were later identified to be asso-ciated with the phenotypic variation against race 5-specific susceptible (SCNU1154, PMR45, WMR29, and Edisto47) and resistant (PI 414723, PMR 5, and MR1) lines in C. melo via derived cleaved amplified polymorphic sequence (dCAPS) assay, indicating their linkage with resistance against PM race-5 (Howlader et al. 2020). Here, we designed HRM markers and validated their genotyping efficacy in diverse natural populations and the developed F2 segregating generations. Among these three markers, PMm-HRM-1 showed more than 90% accuracy in genoty-ping the resistance status of both melon accessions and F2 segregating populations, as opposed to only ∼80% accuracy of the other two markers, PMm-HRM-2 and PMm-HRM-3, in F2 population (Supplementary Table 1). The SNPs, SNPR5-120 and SNPR5-121, are located in the intergenic region between the genes, MELO3C002316 and MELO 3C002317. Whereas, SNPR5-119 is located in the intra-genic region of the intron-less leucine-rich repeat (LRR) receptor-like protein kinase family gene, MELO3C002393 on chromosome 12 (Table 3). Plant R genes are mainly encoded with nucleotide-binding site leucine-rich repeat (NBS-LRRs), LRR, receptor-like protein kinases (RLKs) and LRR-RLKs domains, all of which are involved in plant defense against pathogens (Ellis et al. 2000; Eitas and Dangl 2010; Brotman et al. 2013; Harris et al. 2013; Kourelis and Van Der Hoorn 2018). The LRR domain provides pathogen recognition specificity (DeYoung and Innes 2006; Eitas and Dangl 2010). Moreover, the NBS-LRR domain in plant immune receptors relies on the LRR domain to perform many important roles (Padmanabhan et al. 2009), and mutations in the LRR domain may result in a susceptible phenotype. SNPR5-119 results in a missense mutation (Aspartic acid [N] → Asparagine [D]) in the LRR region of MELO3C002393, indicating its potential role in eventual protein product and thereby, influencing the ability to confer resistance against race 5 (Supplementary Fig. 4). Taken together, these findings suggest that the SNP maker, PMm-HRM-1, can effectively be used in HRM assay to detect P. xanthii race 5 resistant and susceptible melon genotypes and, hence, can be used as high through-put molecular markers in MAS based breeding programs.
In this study, we showed that P. xanthii race 5 resistance in melon line ‘PMR 5’ is regulated by a monogenic dominant gene. To validate the three SNPs, SNPR5-119, SNPR5-120, and SNPR5-121 on chromosome 12, we developed three HRM markers, ‘PMm-HRM-1’, ‘PMm- HRM-2’, and ‘PMm-HRM-3’, respectively. These three markers showed consistency with the phenotypic results of both diverse melon accessions and F2 populations. Among these, “PMm-HRM-1” marker showed high accuracy com-pared to other markers. We suggested three candidate genes associated with P. xanthii race 5 resistance as key genes for further candidate gene analysis. These findings will be helpful in the incorporation of P. xanthii race 5 resistance in commercial melon cultivars.
Ethics approval and consent to participate
Not applicable.
Consent for publication
Not applicable.
Availability of data and materials
The raw sequence data from this study have been de-po-sited in the publicly accessible National Center for Biotech-nology Information (NCBI, https://www.ncbi.nlm.nih.gov/) database as PRJNA804585. The datasets supporting the conclusions of this article are included within the article and its additional files.
All our experiments complied with local and national regulations.
pbb-10-4-272-supple.zip
Not applicable.

CONFLICT OF INTEREST

The authors declare that they have no competing interests.

FUNDING

This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Digital Breeding Transformation Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (Project number 322071-03) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A3A 13077074).

AUTHOR’S CONTRIBUTIONS

I.-S.N. and H.-J.J. conceptualized the work, J.-E.H. conducted all experiments and J.-E.H. & M.R.H. prepared the data, interpreted the results, and wrote the manuscript. All authors read and approved the final manuscript.

Fig. 1
Phenotypes of melon lines PMR 5 (resistant) and SCNU1154 (susceptible) after inoculation with P. xanthii race 5. Scale bar = 2 cm.
pbb-10-4-272-f1.jpg
Fig. 2
Phenotypes of the resistant and susceptible, and their F1 generation two-weeks after inoculation with P. xanthii race 5. R: Resistance, S: Susceptible. Scale bar = 2 cm.
pbb-10-4-272-f2.jpg
Fig. 3
Melting curves of three HRM markers, PMm-HRM-1, PMm-HRM-2 and PMm-HRM-3, developed and validated in this study. Blue curves: Plants of ‘PMR 5’ genotype (resistant), red curves: Plants of ‘SCNU1154’ genotype (susceptible), Orange curves: heterozygous plants.
pbb-10-4-272-f3.jpg
Table 1
Primer and probe sequences used for discriminating the resistance vs susceptible genotypes via High Resolution Melting (HRM) assay.
Table 1
Marker name SNP name Primer (5’-3’) SNPs
Direction Sequence
PMm-HRM-1 SNPR5-119 Forward CAAATAAAGAACCTTCAGTTTGAATGG
Reverse TGAGTTTAACAATTACCAAAATTCATGG
Probe GTTTATCTTTTGCCTCGATGCGAAA T > C
PMm-HRM-2 SNPR5-120 Forward TATTAGATAAGGAATCAGCCCTTCG
Reverse GTTAGCCAAATGCAGATCAAATCAG
Probe TGGATCTGAATGGTTTCCTGAAAC G > A
PMm-HRM-3 SNPR5-121 Forward ATATTAGATAAGGAATCAGCCCTTCG
Reverse CATATCATTTTACATATACCAACCTAGC
Probe TTTCCTGAAACTGGGATTCCGTTTA T > A

Bold and underlined letter indicate SNP position.

Table 2
Inheritance of P. xanthii race 5 resistance in Cucumis melo.
Table 2
Crosses Generation Number of susceptible plants Number of resistant plants Expected
ratio (S:R)		 Chi-Square
(x2)		 P
SCUN1154 ♀ (S) P1 12 0 - - -
PMR 5 ♂ (R) P2 0 12 - - -
PMR 5 × SCUN1154 F1 0 12 - - -
PMR 5 × SCUN1154 F2 33 104 1:3 0.06 0.805

Resistant and susceptible genotypes are assessed by >10% and <10% of PM affected leaf area, respectively.

Table 3
Genomic location of SNPs and their variation with the melon genome.
Table 3
Chromosome SNP name SNP position Gene Ref* SCNU1154 PMR 5
Chr12 SNPR5-119 23,192,595 Intragenic region (Exon) MELO3C002393 T C/C T/T
Chr12 SNPR5-120 23,769,828 Intergenic region MELO3C002316-MELO3C002317 G A/A G/G
Chr12 SNPR5-121 23,769,833 Intergenic region MELO3C002316-MELO3C002317 T A/A T/T

*C. melo genome database.

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Inheritance of Resistance to Race 5 of Powdery Mildew Fungus Podosphaera xanthii in Melon and Development of Race 5-Specific High Resolution Melting Markers
Plant Breed. Biotech.. 2022;10(4):272-281.   Published online December 1, 2022
DOI: https://doi.org/10.9787/PBB.2022.10.4.272
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Inheritance of Resistance to Race 5 of Powdery Mildew Fungus Podosphaera xanthii in Melon and Development of Race 5-Specific High Resolution Melting Markers
Plant Breed. Biotech.. 2022;10(4):272-281.   Published online December 1, 2022
DOI: https://doi.org/10.9787/PBB.2022.10.4.272
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Inheritance of Resistance to Race 5 of Powdery Mildew Fungus Podosphaera xanthii in Melon and Development of Race 5-Specific High Resolution Melting Markers
Image Image Image
Fig. 1 Phenotypes of melon lines PMR 5 (resistant) and SCNU1154 (susceptible) after inoculation with P. xanthii race 5. Scale bar = 2 cm.
Fig. 2 Phenotypes of the resistant and susceptible, and their F1 generation two-weeks after inoculation with P. xanthii race 5. R: Resistance, S: Susceptible. Scale bar = 2 cm.
Fig. 3 Melting curves of three HRM markers, PMm-HRM-1, PMm-HRM-2 and PMm-HRM-3, developed and validated in this study. Blue curves: Plants of ‘PMR 5’ genotype (resistant), red curves: Plants of ‘SCNU1154’ genotype (susceptible), Orange curves: heterozygous plants.

Fig. 1

Fig. 2

Fig. 3

Inheritance of Resistance to Race 5 of Powdery Mildew Fungus Podosphaera xanthii in Melon and Development of Race 5-Specific High Resolution Melting Markers

Primer and probe sequences used for discriminating the resistance vs susceptible genotypes via High Resolution Melting (HRM) assay.

Marker name SNP name Primer (5’-3’) SNPs
Direction Sequence
PMm-HRM-1 SNPR5-119 Forward CAAATAAAGAACCTTCAGTTTGAATGG
Reverse TGAGTTTAACAATTACCAAAATTCATGG
Probe GTTTATCTTTTGCCTCGATGCGAAA T > C
PMm-HRM-2 SNPR5-120 Forward TATTAGATAAGGAATCAGCCCTTCG
Reverse GTTAGCCAAATGCAGATCAAATCAG
Probe TGGATCTGAATGGTTTCCTGAAAC G > A
PMm-HRM-3 SNPR5-121 Forward ATATTAGATAAGGAATCAGCCCTTCG
Reverse CATATCATTTTACATATACCAACCTAGC
Probe TTTCCTGAAACTGGGATTCCGTTTA T > A

Inheritance of P. xanthii race 5 resistance in Cucumis melo.

Crosses Generation Number of susceptible plants Number of resistant plants Expected
ratio (S:R)		 Chi-Square
(x2)		 P
SCUN1154 ♀ (S) P1 12 0 - - -
PMR 5 ♂ (R) P2 0 12 - - -
PMR 5 × SCUN1154 F1 0 12 - - -
PMR 5 × SCUN1154 F2 33 104 1:3 0.06 0.805

Genomic location of SNPs and their variation with the melon genome.

Chromosome SNP name SNP position Gene Ref* SCNU1154 PMR 5
Chr12 SNPR5-119 23,192,595 Intragenic region (Exon) MELO3C002393 T C/C T/T
Chr12 SNPR5-120 23,769,828 Intergenic region MELO3C002316-MELO3C002317 G A/A G/G
Chr12 SNPR5-121 23,769,833 Intergenic region MELO3C002316-MELO3C002317 T A/A T/T
Table 1 Primer and probe sequences used for discriminating the resistance vs susceptible genotypes via High Resolution Melting (HRM) assay.

Bold and underlined letter indicate SNP position.

Table 2 Inheritance of P. xanthii race 5 resistance in Cucumis melo.

Resistant and susceptible genotypes are assessed by >10% and <10% of PM affected leaf area, respectively.

Table 3 Genomic location of SNPs and their variation with the melon genome.

*C. melo genome database.

Table 1

Table 2

Table 3

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