Natural variation in the NAC transcription factor NONRIPENING contributes to melon fruit ripening
文献类型： 外文期刊
作者： Wang, Jinfang 1 ; Tian, Shouwei 1 ; Yu, Yongtao 1 ; Ren, Yi 1 ; Guo, Shaogui 1 ; Zhang, Jie 1 ; Li, Maoying 1 ; Zhang, Haiying 1 ; Gong, Guoyi 1 ; Wang, Min 2 ; Xu, Yong 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Key Lab Vegetable Germplasm Improvement, Key Lab Biol & Genet Improvement Hort Crops North, Natl Watermelon & Melon Improvement Ctr, Beijing 100097, Peoples R China
2.Hainan Acad Agr Sci, Sanya Inst, Haikou 572025, Hainan, Peoples R China
关键词： climacteric fruit; fruit ripening; melon; NAC transcription factor
期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.106； 五年影响因子：8.241 ）
ISSN： 1672-9072
年卷期： 2022 年 64 卷 7 期
页码：
收录情况： SCI
摘要： The NAC transcription factor NONRIPENING (NOR) is a master regulator of climacteric fruit ripening. Melon (Cucumis melo L.) has climacteric and non-climacteric fruit ripening varieties and is an ideal model to study fruit ripening. Two natural CmNAC-NOR variants, the climacteric haplotype CmNAC-NORS,N and the non-climacteric haplotype CmNAC-NORA,S, have effects on fruit ripening; however, their regulatory mechanisms have not been elucidated. Here, we report that a natural mutation in the transcriptional activation domain of CmNAC-NORS,N contributes to climacteric melon fruit ripening. CmNAC-NOR knockout in the climacteric-type melon cultivar "BYJH" completely inhibited fruit ripening, while ripening was delayed by 5-8 d in heterozygous cmnac-nor mutant fruits. CmNAC-NOR directly activated carotenoid, ethylene, and abscisic acid biosynthetic genes to promote fruit coloration and ripening. Furthermore, CmNAC-NOR mediated the transcription of the "CmNAC-NOR-CmNAC73-CmCWINV2" module to enhance flesh sweetness. The transcriptional activation activity of the climacteric haplotype CmNAC-NORS,N on these target genes was significantly higher than that of the non-climacteric haplotype CmNAC-NORA,S. Moreover, CmNAC-NORS,N complementation fully rescued the non-ripening phenotype of the tomato (Solanum lycopersicum) cr-nor mutant, while CmNAC-NORA,S did not. Our results provide insight into the molecular mechanism of climacteric and non-climacteric fruit ripening in melon.
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