Whole-genome resequencing-based QTL-seq identified AhTc1 gene encoding a R2R3-MYB transcription factor controlling peanut purple testa colour
文献类型： 外文期刊
作者： Zhao, Yuhan 1 ; Ma, Junjie 1 ; Li, Ming 1 ; Deng, Li 4 ; Li, Guanghui 1 ; Xia, Han 1 ; Zhao, Shuzhen 1 ; Hou, Lei 1 ; Li, Pengcheng 1 ; Ma, Changle 2 ; Yuan, Mei 5 ; Ren, Li 4 ; Gu, Jianzhong 4 ; Guo, Baozhu 6 ; Zhao, Chuanzhi 1 ; Wang, Xingjun 1 ;
作者机构： 1.Shandong Acad Agr Sci, Biotechnol Res Ctr, Shandong Prov Key Lab Crop Genet Improvement, Jinan, Peoples R China
2.Shandong Normal Univ, Coll Life Sci, Jinan, Peoples R China
3.Shandong Univ, Coll Life Sci, Jinan, Peoples R China
4.Kaifeng Acad Agr & Forestry, Kaifeng, Peoples R China
5.Shandong Peanut Res Inst, Qingdao, Shandong, Peoples R China
6.USDA ARS, Crop Protect & Management Res Unit, Tifton, GA 31793 USA
7.Univ Georgia, Dept Plant Pathol, Tifton, GA 31793 USA
关键词： peanut; testa colour; AhTc1; QTL-seq; BSA; antioxidant
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）
ISSN： 1467-7644
年卷期： 2020 年 18 卷 1 期
页码：
收录情况： SCI
摘要： Peanut (Arachis hypogaea. L) is an important oil crop worldwide. The common testa colours of peanut varieties are pink or red. But the peanut varieties with dark purple testa have been focused in recent years due to the potential high levels of anthocyanin, an added nutritional value of antioxidant. However, the genetic mechanism regulating testa colour of peanut is unknown. In this study, we found that the purple testa was decided by the female parent and controlled by a single major gene named AhTc1. To identify the candidate gene controlling peanut purple testa, whole-genome resequencing-based approach (QTL-seq) was applied, and a total of 260.9 Gbof data were generated from the parental and bulked lines. SNP index analysis indicated that AhTc1 located in a 4.7 Mb region in chromosome A10, which was confirmed by bulked segregant RNA sequencing (BSR) analysis in three segregation populations derived from the crosses between pink and purple testa varieties. Allele-specific markers were developed and demonstrated that the marker pTesta1089 was closely linked with purple testa. Further, AhTc1 encoding a R2R3-MYB gene was positional cloned. The expression of AhTc1 was significantly up-regulated in the purple testa parent YH29. Overexpression of AhTc1 in transgenic tobacco plants led to purple colour of leaves, flowers, pods and seeds. In conclusion, AhTc1, encoding a R2R3-MYB transcription factor and conferring peanut purple testa, was identified, which will be useful for peanut molecular breeding selection for cultivars with purple testa colour for potential increased nutritional value to consumers.
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