拟南芥 WRKY1 通过综合调控开花、叶片衰老和氮素再动员促进单果衰老。

IF 17.1 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Molecular Plant Pub Date : 2024-08-05 Epub Date: 2024-07-14 DOI:10.1016/j.molp.2024.07.005
Wei Zhang, Shufei Tang, Xuying Li, Yuanyuan Chen, Jiajia Li, Yuyang Wang, Ruichao Bian, Ying Jin, Xiaoxian Zhu, Kewei Zhang
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引用次数: 0

摘要

单子叶衰老的特点是在一个开花期之后整个植株衰老,它广泛存在于种子植物,尤其是农作物中,决定着种子的收获时间和质量。然而,外部和内部信号如何系统地整合到单子叶衰老中,在很大程度上仍是未知数。在这里,我们发现拟南芥转录因子 WRKY1 在单果型衰老的多个关键步骤中发挥着重要作用。WRKY1的表达受年龄、SA和氮(N)缺乏的诱导。在 WRKY1 过表达株系中,开花和叶片衰老得到促进,但在 wrky1 突变体中,开花和叶片衰老被延迟。DAP-Seq 和 RNA-Seq 联合分析发现了 WRKY1 的直接靶基因。进一步的研究表明,WRKY1 在单果型衰老中协调调控三个过程:1)抑制开花定位点 C 基因的表达以启动开花;2)诱导 SA 生物合成基因以促进叶片衰老;3)激活氮同化和转运基因以触发氮的再动员。总之,我们揭示了一个胁迫响应转录因子 WRKY1 如何协同作用,将开花和叶片衰老整合为单果型衰老,为植物寿命调控提供了重要见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Arabidopsis WRKY1 promotes monocarpic senescence by integrative regulation of flowering, leaf senescence, and nitrogen remobilization.

Monocarpic senescence, characterized by whole-plant senescence following a single flowering phase, is widespread in seed plants, particularly in crops, determining seed harvest time and quality. However, how external and internal signals are systemically integrated into monocarpic senescence remains largely unknown. Here, we report that the Arabidopsis thaliana transcription factor WRKY1 plays essential roles in multiple key steps of monocarpic senescence. WRKY1 expression is induced by age, salicylic acid (SA), and nitrogen (N) deficiency. Flowering and leaf senescence are accelerated in the WRKY1 overexpression lines but are delayed in the wrky1 mutants. The combined DNA affinity purification sequencing and RNA sequencing analyses uncover the direct target genes of WRKY1. Further studies show that WRKY1 coordinately regulates three processes in monocarpic senescence: (1) suppressing FLOWERING LOCUS C gene expression to initiate flowering, (2) inducing SA biosynthesis genes to promote leaf senescence, and (3) activating the N assimilation and transport genes to trigger N remobilization. In summary, our study reveals how one stress-responsive transcription factor, WRKY1, integrates flowering, leaf senescence, and N remobilization processes into monocarpic senescence, providing important insights into plant lifetime regulation.

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来源期刊
Molecular Plant
Molecular Plant 植物科学-生化与分子生物学
CiteScore
37.60
自引率
2.20%
发文量
1784
审稿时长
1 months
期刊介绍: Molecular Plant is dedicated to serving the plant science community by publishing novel and exciting findings with high significance in plant biology. The journal focuses broadly on cellular biology, physiology, biochemistry, molecular biology, genetics, development, plant-microbe interaction, genomics, bioinformatics, and molecular evolution. Molecular Plant publishes original research articles, reviews, Correspondence, and Spotlights on the most important developments in plant biology.
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