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Genome-wide association study and genetic mapping of BhWAX conferring mature fruit cuticular wax in wax gourd

文献类型： 外文期刊

作者： Yan, Jinqiang 1 ; Chen, Feng 2 ; Sun, Piaoyun 2 ; Liu, Wenrui 1 ; Xie, Dasen 1 ; Qian, Yulei 2 ; Jiang, Biao 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou 510640, Guangdong, Peoples R China

2.Guangdong Key Lab New Technol Res Vegetables, Guangzhou 510640, Guangdong, Peoples R China

关键词： Wax gourd; Fruit; Cuticular wax; GWAS; Genetic mapping; MBOAT

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.26； 五年影响因子：5.761 ）

ISSN： 1471-2229

年卷期： 2022 年 22 卷 1 期

页码：

收录情况： SCI

摘要： Background Wax gourd [Benincasa hispida (Thunb) Cogn. (2n = 2x = 24)] is an economically important vegetable crop of genus Benincasa in the Cucurbitaceae family. Fruit is the main consumption organ of wax gourd. The mature fruit cuticular wax (MFCW) is an important trait in breeding programs, which is also of evolutionary significance in wax gourd. However, the genetic architecture of this valuable trait remains unrevealed. Results In this study, genetic analysis revealed that the inheritance of MFCW was controlled by a single gene, with MFCW dominant over non-MFCW, and the gene was primarily named as BhWAX. Genome-wide association study (GWAS) highlighted a 1.1 Mb interval on chromosome 9 associated with MFCW in wax gourd germplasm resources. Traditional fine genetic mapping delimited BhWAX to a 0.5 Mb region containing 12 genes. Based on the gene annotation, expression analysis and co-segregation analysis, Bhi09G001428 that encodes a membrane bound O-acyltransferase (MBOAT) was proposed as the candidate gene for BhWAX. Moreover, it was demonstrated that the efficiency of a cleaved amplified polymorphic sequences (CAPS) marker in the determination of MFCW in wax gourd reached 80%. Conclusions In closing, the study identified the candidate gene controlling MFCW and provided an efficient molecular marker for the trait in wax gourd for the first time, which will not only be beneficial for functional validation of the gene and marker-assisted breeding of wax gourd, but also lay a foundation for analysis of its evolutionary meaning among cucurbits.

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