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Wheat TaANS-6D positively regulates leaf senescence through the abscisic acid mediated chlorophyll degradation in tobacco

文献类型： 外文期刊

作者： Li, Luhua 1 ; An, Chang 1 ; Wang, Zhongni 3 ; Xiong, Fumin 1 ; Wang, Yingxi 1 ; Ren, Mingjian 1 ; Xu, Ruhong 1 ;

作者机构： 1.Guizhou Univ, Coll Agr, Guiyang 550025, Peoples R China

2.Guizhou Sub Ctr Natl Wheat Improvement Ctr, Guiyang 550025, Peoples R China

3.Guizhou Acad Agr Sci, Guizhou Rice Res Inst, Guiyang 550006, Peoples R China

关键词： TaANS-6D; Anthocyanin; Chlorophyll degradation; ABA; ABF

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.242； 五年影响因子：3.607 ）

ISSN： 0167-6903

年卷期： 2022 年 98 卷 1 期

页码：

收录情况： SCI

摘要： Anthocyanidin synthase (ANS) is involved in the synthesis of anthocyanins, which are important phytonutrients because of their beneficial effects on human health. Here, we identified ANS-6D of purple-colored Triticum aestivum L. cv. Guizi 1 (Gz1) that is involved in leaf senescence through the abscisic acid (ABA) mediated chlorophyll degradation pathway in tobacco. After characterizing the leaf-senescence phenotype in TaANS-6D overexpression (OxTaANS-6D) lines, we found that the increased anthocyanin accumulation and decreased chlorophyll content in OxTaANS-6D lines were closely correlated with the expression levels of anthocyanin synthesis-related structural genes and senescence marker genes, as well as the accumulation of reactive oxygen species. The endogenous ABA content increased and ethylene content decreased in OxTaANS-6D transgenic lines compared with wild type. Additionally, the levels of the abscisic acid-responsive transcription factors ABF1 and ABF2, as well as those of chlorophyll degradation-related genes (PAO (pheophorbide a oxygenase), NYC (non-yellow coloring), SGR (non-yellowing, also known as NYE) and CHL (chlorophyllase)), were significantly higher in OxTaANS-6D transgenic lines than in wild type. Furthermore, we found that TaABF1 and NtABF1 binds to the promoter of TaANS-6D, and NtABF2 binds to the promoter of NtSGR. Thus, TaANS-6D participated in leaf senescence through ABA-mediated chlorophyll degradation, and ABF1/2 play important role in TaANS-6D functions.

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