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QTL mapping of powdery mildew resistance in WI 2757 cucumber (Cucumis sativus L.)

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Title QTL mapping of powdery mildew resistance in WI 2757 cucumber (Cucumis sativus L.)
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Creator Xiaoming He
Yuhong Li
Sudhakar Pandey
Brain S Yandell
Mamta Pathak
Yiqun Weng
 
Subject Quantitative Trait locus, Powdery Mildew, Quantitative Trait Locus Analysis, Quantitative Trait Locus Mapping, Disease Index
 
Description Not Available
Powdery mildew (PM) is a very important disease of cucumber (Cucumis sativus L.). Resistant cultivars have been deployed in production for a long time, but the genetic mechanisms of PM resistance in cucumber are not well understood. A 3-year QTL mapping study of PM resistance was conducted with 132 F2:3 families derived from two cucumber inbred lines WI 2757 (resistant) and True Lemon (susceptible). A genetic map covering 610.4 cM in seven linkage groups was developed with 240 SSR marker loci. Multiple QTL mapping analysis of molecular marker data and disease index of the hypocotyl, cotyledon and true leaf for responses to PM inoculation identified six genomic regions in four chromosomes harboring QTL for PM resistance in WI 2757. Among the six QTL, pm1.1 and pm1.2 in chromosome 1 conferred leaf resistance. Minor QTL pm3.1 (chromosome 3) and pm4.1 (chromosome 4) contributed to disease susceptibility. The two major QTL, pm5.1 and pm5.2 were located in an interval of ~40 cM in chromosome 5 with each explaining 21.0–74.5 % phenotypic variations. Data presented herein support two recessively inherited, linked major QTL in chromosome 5 plus minor QTL in other chromosomes that control the PM resistance in WI 2757. The QTL pm5.2 for hypocotyl resistance plays the most important role in host resistance. Multiple observations in the same year revealed the importance of scoring time in the detection of PM resistance QTL. Results of this study provided new insights into phenotypic and genetic mechanisms of powdery mildew resistance in cucumber.
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Date 2021-07-19T06:54:31Z
2021-07-19T06:54:31Z
2013-05-21
 
Type Research Paper
 
Identifier He, X., Li, Y., Pandey, S. et al. QTL mapping of powdery mildew resistance in WI 2757 cucumber (Cucumis sativus L.). Theor Appl Genet 126, 2149–2161 (2013). https://doi.org/10.1007/s00122-013-2125-6
0040-5752 (print) 1432-2242 (web)
http://krishi.icar.gov.in/jspui/handle/123456789/48692
 
Language English
 
Relation Not Available;
 
Publisher Springer Berlin Heidelberg