Temporal control of the Aux/IAA genes BnIAA32 and BnIAA34 mediates Brassica napus dual shade responses

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外文摘要：Precise responses to changes in light quality are crucial for plant growth and development.For ex-ample,hypocotyls of shade-avoiding plants typically elongate under shade conditions.Although this typical shade-avoidance response(TSR)has been studied in Arabidopsis(Arabidopsis thaliana),the molecular mechanisms underlying shade tolerance are poorly understood.Here we report that B.napus(Brassica napus)seedlings exhibit dual shade re-sponses.In addition to the TSR,B.napus seedlings also display an atypical shade response(ASR),with shorter hypocotyls upon perception of early-shade cues.Genome-wide selective sweep analysis in-dicated that ASR is associated with light and auxin signaling.Moreover,genetic studies demonstrated that phytochrome A(BnphyA)promotes ASR,whereas BnphyB inhibits it.During ASR,YUCCA8 expression is activated by early-shade cues,leading to increased auxin biosynthesis.This inhibits hypo-cotyl elongation,as young B.napus seedlings are highly sensitive to auxin.Notably,two non-canonical AUXIN/INDOLE-3-ACETIC ACID(Aux/IAA)repressor genes,BnIAA32 and BnIAA34,are expressed during this early stage.BnIAA32 and BnIAA34 inhibit hypocotyl elongation under shade conditions,and mutations in BnIAA32 and BnIAA34 suppress ASR.Collectively,our study demonstrates that the temporal expression of BnIAA32 and BnIAA34 determines the behavior of B.napus seedlings fol-lowing shade-induced auxin biosynthesis.

外文关键词：

Brassica napushigh-density plantingIAA32/34light signal transductionshade responsetemporal gene expression

作者：

Yafei Li、Yiyi Guo、Yue Cao、Pengguo Xia、Dongqing Xu、Ning Sun、Lixi Jiang、Jie Dong

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作者单位：

Institute of Crop Science,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou 310058,China

Key Laboratory of Plant Secondary Metabolism and Regulation of Zhejiang Province,College of Life Sciences and Medicine,Zhejiang Sci-Tech University,Hangzhou 310018,China

State Key Laboratory of Crop Genetics and Germplasm Enhancement,College of Agriculture,Nanjing Agricultural University,Nanjing 210095,China

Key Laboratory of Growth Regulation and Transformation Research of Zhejiang Province,School of Life Sciences,Westlake University,Hangzhou 310024,China

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基金：

Scientific Innovation 2030 ProjectNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Fund for Excellent Young Scientists Fund Program(Overseas)

项目编号：

2022ZD04008012022YFD120040032100190

出版年：

2024

DOI：

10.1111/jipb.13582

植物学报(英文版)

中国植物学会

植物学报(英文版)

CSTPCD

影响因子：0.921

ISSN：1672-9072

年,卷(期)：2024.66(5)