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Three BnaIAA7 homologs are involved in auxin/brassinosteroid-mediated plant morphogenesis in rapeseed (Brassica napus L.)

文献类型： 外文期刊

作者： Zheng, Ming 1 ; Hu, Maolong 2 ; Yang, Hongli 1 ; Tang, Min 1 ; Zhang, Liang 1 ; Liu, Hongfang 1 ; Li, Xiaokang 1 ; Liu, J 1 ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Biol & Genet Improvement Oil Crops, Minist Agr, Oil Crops Res Inst, Wuhan 430062, Hubei, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Ind Crops, Minist Agr, Key Lab Cotton & Rapeseed, Nanjing 210014, Jiangsu, Peoples R China

3.Wilkes Univ, Dept Biol, Wilkes Barre, PA 18766 USA

关键词： Brassica napus; Plant height; Auxin; Brassinosteroid; BnaIAA7s; BnaARF8; BnaBZR1

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2019 年 38 卷 8 期

页码：

收录情况： SCI

摘要： Key messageBnaIAA7 crosstalk with BR signaling is mediated by the interaction between BnaARF8 and BnaBZR1 to regulate rapeseed plant morphogenesis.AbstractAuxin (indole-3-acetic acid, IAA) and brassinosteroids (BRs) are essential regulators of plant morphogenesis. However, their roles in rapeseed have not been reported. Here, we identified an extremely dwarf1 (ed1) mutant of rapeseed that displays reduced stature, short hypocotyls, as well as wavy and curled leaves. We isolated ED1 by map-based cloning, and found that it encodes a protein homologous to AtIAA7. ED1 acts as a repressor of IAA signaling, and IAA induces its degradation through its degron motif. A genomic-synteny analysis revealed that ED1 has four homologs in rapeseed, but two were not expressed. Analyses of transcriptomes and of various mutant BnaIAA7s in transgenic plants revealed that the three expressed BnaIAA7 homologs had diverse expression patterns. ED1/BnaC05.IAA7 predominantly functioned in stem elongation, BnaA05.IAA7 was essential for reproduction, while BnaA03.IAA7 had the potential to reduce plant height. Physical interaction assays revealed that the three BnaIAA7 homologs interacted in different ways with BnaTIRs/AFBs and BnaARFs, which may regulate the development of specific organs. Furthermore, BnaARF8 could directly interact with the BnaIAA7s and BnaBZR1. We propose that BnaIAA7s interact with BR signaling via BnaARF8 and BnaBZR1 to regulate stem elongation in rapeseed.

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