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Genome-wide identification reveals a bZIP transcription factor modulating chlorophyll catabolism during leaf yellowing in harvested Chinese flowering cabbage

文献类型： 外文期刊

作者： Zeng, Ze-xiang 1 ; Rong, Yuan 1 ; Fan, Zhong-qi 2 ; Su, Xin-guo 3 ; Chen, Lin 1 ; Han, Yan-chao 4 ; Chen, Hang-jun 4 ; Wei, Wei 1 ; Shan, Wei 1 ; Kuang, Jian-fei 1 ; Lu, Wang-jin 1 ; Chen, Jian-ye 1 ;

作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobio, Guangdong Prov Key Lab Postharvest Sci Fruits & Ve, Minist Educ,Coll Hort,Guangdong Vegetables Engn Re, Guangzhou 510642, Peoples R China

2.Fujian Agr & Forestry Univ, Inst Postharvest Technol Agr Prod, Coll Food Sci, Key Lab Postharvest Biol Subtrop Special Agr Prod, Fuzhou 350002, Peoples R China

3.Guangdong AIB Polytech Coll, Guangzhou 510507, Peoples R China

4.Zhejiang Acad Agr Sci, Food Sci Inst, Minist Agr & Rural Affairs, Key Lab Postharvest Preservat & Proc Vegetables Co, Hangzhou 310021, Peoples R China

关键词： WGCNA; Leaf senescence; Transcriptional regulation; 6-BA

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：6.8； 五年影响因子：7.5 ）

ISSN： 0925-5214

年卷期： 2025 年 225 卷

页码：

收录情况： SCI

摘要： Leaf yellowing caused by chlorophyll catabolism, is the most conspicuous trait of senescence in harvested leafy vegetables. Chlorophyll catabolism is a highly coordinated process primarily regulated by transcription factors (TFs). Therefore, identifying key TFs modulating chlorophyll catabolism is extremely important for understanding the regulatory networks of leafy vegetable yellowing. In this work, based on physiological and transcriptomic perspectives related to cytokinin (CTK) analogue 6-benzylaminopurine (6-BA)-delayed leaf yellowing, a weighted gene co-expression network analysis (WGCNA) was conducted to investigate possible TFs associated with chlorophyll catabolism regulation during senescence of harvested cabbages. A total of 327 TFs from 47 families were identified as candidate regulatory factors. Among these, a member of bZIP family BrTGA1-1 was focused. It was a nuclear-localized transcriptional activator and down-regulated by 6-BA. Further assays showed that it directly bound to the promoters of series chlorophyll catabolic genes (CCGs) including BrNYC1-1, BrNYC1-2, BrNOL and BrSGR1-2, thereby activating their transcription. Meanwhile, transient overexpression of BrTGA1-1 in tobacco leaves up-regulated CCGs expression, and facilitated chlorophyll catabolism, thus promoting leaf yellowing. In summary, BrTGA1-1 acts as an activator in accelerating leaf yellowing via upregulating CCGs, and our genome-wide identification of TFs regulating chlorophyll catabolism provides original insights into the regulatory networks for postharvest yellowing in leafy vegetables.

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