Distinct regulation of mRNA decay pathways by ABA enhances Nitrate Reductase 1/2-derived siRNAs production and stress adaptation.

IF 17.1 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Molecular Plant Pub Date : 2025-05-05 Epub Date: 2025-04-18 DOI:10.1016/j.molp.2025.04.007
Yan Yan, Yinpeng Xie, Qian Gao, Yajie Pan, Xianli Tang, Yuelin Liu, Wenyang Li, Hongwei Guo
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引用次数: 0

Abstract

RNA degradation systems (e.g., RNA decay and RNA interference) and the phytohormone abscisic acid (ABA) are both essential for plant growth, development, and adaptation to stress. Although the interplay between these pathways has been recognized, the molecular mechanisms governing their coordination remain poorly understood. In this study, we revealed that mutations in the 5'-3' RNA-degrading enzyme Ethylene Insensitive 5 (EIN5) result in hypersensitivity to ABA in Arabidopsis, whereas defects in the 3'-5' RNA turnover machinery (ski mutants) do not. The ABA hypersensitivity of ein5 mutants was mitigated by mutating components of the post-transcriptional gene silencing (PTGS) pathway, including DICER-LIKE 2 (DCL2)/DCL4, RNA-Dependent RNA Polymerase 1 (RDR1)/RDR6, and ARGONAUTE 1 (AGO1). ABA treatment substantially increased the abundance of coding-transcript-derived small interfering RNAs (ct-siRNAs) in ein5, predominantly from two genes, Nitrate Reductase 1 (NIA1) and NIA2. Further analysis suggested that NIA1 and NIA2 negatively regulate both the ABA biosynthesis and signaling pathways. The key transcription factor Abscisic Acid Insensitive 3 (ABI3) represses SKI3 expression by directly binding to its promoter, thereby promoting the production of NIA1/NIA2-derived ct-siRNAs, leading to the ABA hypersensitivity of ein5. Conversely, ABA enhances the accumulation of EIN5 as well as DCL4 and AGO1, pointing to distinct regulation of the mRNA decay and PTGS pathways. Collectively, these findings demonstrate the pivotal roles of NIA1 and NIA2 in plant responses to abiotic stress and provide new insights into the interplay between the ABA response and RNA degradation pathways.

ABA对mRNA衰变途径的不同调控促进了硝酸还原酶1/2衍生sirna的产生和胁迫适应。
RNA降解系统(如RNA衰变和RNA干扰)和植物激素脱落酸(ABA)都是植物生长、发育和适应胁迫所必需的。虽然这些途径之间的相互作用已经被认识到,但控制它们协调的分子机制仍然知之甚少。在这项研究中,我们发现5'-3' RNA降解酶乙烯不敏感5 (EIN5)的突变导致拟南芥对ABA过敏,而3'-5' RNA转换机制的缺陷(ski突变体)则不会。通过突变转录后基因沉默(PTGS)途径的组分,包括DICER-LIKE 2 (DCL2)/DCL4、RNA依赖性RNA聚合酶1 (RDR1)/RDR6和ARGONAUTE 1 (AGO1), ein5突变体的ABA超敏性得到缓解。ABA处理显著增加了ein5中编码转录衍生的小干扰rna (ct- sirna)的丰度,主要来自两个基因,硝酸盐还原酶1 (NIA1)和NIA2。进一步分析表明,NIA1和NIA2对ABA生物合成和信号通路均有负调控作用。关键转录因子Abscisic Acid Insensitive 3 (ABI3)通过直接结合其启动子抑制SKI3的表达,从而促进NIA1/ nia2衍生的ct- sirna的产生,导致ein5的ABA超敏。相反,ABA增强了EIN5、DCL4和AGO1的积累,表明对mRNA衰变和PTGS通路有不同的调节作用。总之,这些发现证明了NIA1和NIA2在植物对非生物胁迫反应中的关键作用,并为ABA反应和RNA降解途径之间的相互作用提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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