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QTL for horticulturally important traits associated with pleiotropic andromonoecy and carpel number loci, and a paracentric inversion in cucumber

文献类型： 外文期刊

作者： Pan, Yupeng 1 ; Wen, Changlong 2 ; Han, Yonghua 4 ; Wang, Yuhui 2 ; Li, Yuhong 1 ; Li, Sen 2 ; Cheng, Xiaomao 2 ; Weng, Y 1 ;

作者机构： 1.Northwest A&F Univ, Coll Hort, Yangling 712100, Shaanxi, Peoples R China

2.Univ Wisconsin, Dept Hort, Madison, WI 53706 USA

3.Beijing Acad Agr & Forestry Sci, Beijing 100097, Peoples R China

4.Jiangsu Normal Univ, Inst Integrat Plant Biol, Sch Life Sci, Xuzhou 221116, Jiangsu, Peoples R China

5.Shanxi Agr Univ, Hort Coll, Taigu 030801, Peoples R China

6.USDA ARS, Vegetable Crops Res Unit, 1575 Linden Dr, 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： 2020 年 133 卷 7 期

页码：

收录情况： SCI

摘要： The legendary cucumber inbred line WI2757 possesses a rare combination of resistances against nine pathogens, which is an important germplasm for cucumber breeding. However, WI2757 flowers late and does not perform well under field conditions. The genetic basis for horticulturally important traits other than disease resistances in WI2757 is largely unknown. In this study, we conducted QTL mapping using F-2 and recombinant inbred line (RIL) populations from the WI2757 x True Lemon cross that were segregating for multiple traits. Phenotypic data were collected in replicated field trials across multiple years for seven traits including fruit carpel number (CN) and sex expression. A high-density SNP-based genetic map was developed with genotyping by sequencing of the RIL population, which revealed a region on chromosome 1 with strong recombination suppression. The reduced recombination in this region was due to a similar to 10-Mbp paracentric inversion in WI2757 that was confirmed with additional segregation and cytological (FISH) analyses. Thirty-six QTL were detected for flowering time, fruit length (FL), fruit diameter (FD), fruit shape (LD), fruit number (FN), CN, and powdery mildew resistance. Five moderate- or major-effect QTL for FL, FD, LD, and FN inside the inversion are likely the pleiotropic effects of the andromonoecy (m), or the cn locus. The major-effect flowering time QTL ft1.1 was also mapped inside the inversion, which seems to be different from the previously assigned delayed flowering in WI2757. Implications of these findings on the use of WI2757 in cucumber breeding are discussed.

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