Genetic analysis and identification of QTLs for resistance to cucumber mosaic virus in chili pepper (Capsicum annuum L.)
文献类型： 外文期刊
作者： Yao, Minghua 1 ; Li, Ning 2 ; Wang, Fei 2 ; Ye, Zhibiao 1 ;
作者机构： 1.Huazhong Agr Univ, Minist Educ, Key Lab Hort Plant Biol, Wuhan 430070, Peoples R China
2.Hubei Acad Agr Sci, Cash Crops Res Inst, Wuhan 430064, Peoples R China
关键词： CMV;Genetic analysis;Pepper;QTL (quantitative trait loci)
期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）
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收录情况： SCI
摘要： A pepper (Capsicum annuum) inbred line 'BJ0747-1-3-1-1' was found to exhibit resistance to a cucumber mosaic virus (CMV) local isolate (CMV-HB). In order to exploit the genetic mechanism of CMV resistance in this pepper line, inheritance and genetic linkages of CMV resistance were studied. The CMV-resistant 'BJ0747-1-3-1-1' (P-1) was crossed to the susceptible line 'XJ0630-2-1-2-1-1' (P-2), and the F-2 and back-cross populations (B-1 and B-2) were generated for segregation analysis following a mixed inheritance model. Analysis of the segregation data revealed that CMV resistance in 'BJ0747-1-3-1-1' is controlled by two partially additive-dominant major genes and additive-dominant polygenes. Analysis of the results from two growth seasons also identified two stable and major QTLs for CMV resistance that collectively explained 55 % of the trait variation. One of the two major QTLs was found on linkage group 8 (LG8) between markers TS52 and HpmsE1-43, and accounted for 37.7-43.5 % of the variation in the two inoculation experiments. The other QTL on LG4 between markers UBC843 and S74 was found to be responsible for 10.7-11.2 % of the trait variation. QTLs with minor effects on CMV resistance were also identified. This work provides an example for genetic analysis and QTL mapping of other disease-resistance genes in pepper and the findings should be useful for molecular marker-assisted breeding programs that aim at developing disease-resistant cultivars in peppers.
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