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| Content Provider | frontiers |
|---|---|
| Author | Zhang, Xuejun Ling, Yueming Yang, Wenli Wei, Minghua Wang, Zhenzhu Li, Meihua Yang, Yong Liu, Bin Yi, Hongping Guo, Yang-Dong Kong, Qiusheng |
| Abstract | Abstract Downy mildew (DM) is a major foliar disease globally causing great economic loss in melon production. Utilizing disease-resistant cultivars is the most efficient approach for disease control, while discovery of disease-resistant genes is crucial for the success of DM-resistant breeding. To address this problem, two F2 populations were constructed using the DM-resistant accession PI 442177 in this study, and QTLs conferring DM resistance were mapped using linkage map and QTL-seq analysis, respectively. A high-density genetic map with the length of 1096.7 cM and density of 0.7 cM was generated by using the genotyping-by-sequencing data of a F2 population. A major QTL DM9.1 with the phenotypic variance explained proportion of 24.3-37.7% was consistently detected at the early, middle, and late growth stages using the genetic map. QTL-seq analyses on the two F2 populations also validated the presence of DM9.1. Kompetitive Allele-Specific PCR (KASP) assay was further carried out to fine map DM9.1 into 1.0 Mb interval. A KASP marker co-segregating with DM9.1 was successfully developed. These results not only provided valuable information for DM-resistant gene cloning, but also offered useful markers for melon DM-resistant breeding programs. |
| ISSN | 1664462X |
| DOI | 10.3389/fpls.2023.1202775 |
| Volume Number | 14 |
| Journal | Frontiers in Plant Science |
| Language | English |
| Publisher Date | 2023-06-12 |
| Access Restriction | Open |
| Subject Keyword | Downy mildew Melon Linkage map QTL QTL-seq |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science |
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