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Phosphorylated transcription factor PuHB40 mediates ROS-dependent anthocyanin biosynthesis in pear exposed to high light

文献类型： 外文期刊

作者： Zhang, Lu 1 ; Wang, Lu 1 ; Fang, Yongchen 1 ; Gao, Yuhao 1 ; Yang, Shulin 1 ; Su, Jun 2 ; Ni, Junbei 1 ; Teng, Yuanwen 1 ; Bai, Songling 1 ;

作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310058, Zhejiang, Peoples R China

2.Yunnan Acad Agr Sci, Inst Hort, Kunming 650205, Peoples R China

3.Zhejiang Univ, Hainan Inst, Sanya 572000, Hainan, Peoples R China

期刊名称：PLANT CELL （ 影响因子：10.0； 五年影响因子：11.1 ）

ISSN： 1040-4651

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Plants are increasingly vulnerable to environmental stresses because of global warming and climate change. Stress-induced reactive oxygen species (ROS) accumulation results in plant cell damage, even cell death. Anthocyanins are important antioxidants that scavenge ROS to maintain ROS homeostasis. However, the mechanism underlying ROS-induced anthocyanin accumulation is unclear. In this study, we determined that the HD-Zip I family member transcription factor PuHB40 mediates ROS-dependent anthocyanin biosynthesis under high-light stress in pear (Pyrus ussuriensis). Specifically, PuHB40 induces the PuMYB123-like-PubHLH3 transcription factor complex for anthocyanin biosynthesis. The PuHB40-mediated transcriptional activation depends on its phosphorylation level, which is regulated by protein phosphatase PP2A. Elevated ROS content maintains high PuHB40 phosphorylation levels while also enhancing the PuHB40-induced PuMYB123-like transcription by decreasing the PuPP2AA2 expression, ultimately leading to increased anthocyanin biosynthesis. Our study reveals a pathway regulating the ROS-induced anthocyanin biosynthesis in pears, further clarifying the mechanism underlying the abiotic stress-induced anthocyanin biosynthesis, which may have implications for improving plant stress tolerance. Reactive oxygen species regulate anthocyanin biosynthesis in pear via PP2A-HB40 module under high-light stress.

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