文献类型： 外文期刊
作者： He, Xiaoming 1 ; Li, Yuhong 1 ; Pandey, Sudhakar 1 ; Yandell, Brain S. 1 ; Pathak, Mamta 1 ; Weng, Yiqun 1 ;
作者机构： 1.Univ Wisconsin, Dept Hort, Madison, WI 53706 USA
2.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou 510640, Guangdong, Peoples R China
3.Northwest A&F Univ, Hort Coll, Yangling 712100, Peoples R China
4.Indian Inst Vegetable Res, Varanasi 221305, Uttar Pradesh, India
5.Univ Wisconsin, Dept Stat, Madison, WI 53706 USA
6.Punjab Agr Univ, Dept Vegetable Sci, Ludhiana 141004, Punjab, India
7.USDA ARS, Vegetable Crops Res Unit, Madison, WI 53706 USA
期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）
ISSN： 0040-5752
年卷期： 2013 年 126 卷 8 期
页码：
收录情况： SCI
摘要： 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 F-2:3 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 similar to 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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