生长素-水杨酸跷跷板调节植物生长和食草动物防御之间的年龄依赖平衡

IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Wen-Hao Han, Feng-Bin Zhang, Shun-Xia Ji, Kai-Lu Liang, Jun-Xia Wang, Xiao-Ping Fan, Shu-Sheng Liu, Xiao-Wei Wang
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引用次数: 0

摘要

根据植物活力假说,年轻、更有活力的植物比年老、成熟的植物更容易受到食草动物的影响,但这种动态背后的分子机制仍然难以捉摸。在这里,我们发现了一个激素串扰框架,它协调了植物生长和食草动物防御之间与年龄相关的平衡。我们证明了由烟叶苯丙氨酸解氨酶6 (NbPAL6)合成的水杨酸(SA)的积累决定了成虫植株的抗虫性。NbPAL6的表达受关键转录因子NbMYB42驱动,NbMYB42受两个相互作用的生长素反应因子NbARF18La/b调控。在幼嫩植物中,较高的生长素水平激活NbmiR160c,这是一种同时沉默NbARF18La/b的microRNA,随后降低NbMYB42的表达,降低SA的积累,从而削弱草食动物的防御。幼植株中过量的SA增强了植株的防御能力,但会拮抗生长素信号,损害植株的早期生长。我们的研究结果表明,根据植物的发育阶段,一个类似跷跷板的模型可以平衡生长和防御。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Auxin-salicylic acid seesaw regulates the age-dependent balance between plant growth and herbivore defense

Auxin-salicylic acid seesaw regulates the age-dependent balance between plant growth and herbivore defense
According to the plant vigor hypothesis, younger, more vigorous plants tend to be more susceptible to herbivores compared to older, mature plants, yet the molecular mechanisms underlying this dynamic remain elusive. Here, we uncover a hormonal cross-talk framework that orchestrates the age-related balance between plant growth and herbivore defense. We demonstrate that the accumulation of salicylic acid (SA), synthesized by Nicotiana benthamiana phenylalanine ammonia-lyase 6 (NbPAL6), dictates insect resistance in adult plants. NbPAL6 expression is driven by the key transcription factor, NbMYB42, which is regulated by two interacting auxin response factors, NbARF18La/b. In juvenile plants, higher auxin levels activate NbmiR160c, a microRNA that simultaneously silences NbARF18La/b, subsequently reducing NbMYB42 expression, lowering SA accumulation, and thus weakening herbivore defense. Excessive SA in juvenile plants enhances defense but antagonizes auxin signaling, impairing early growth. Our findings suggest a seesaw-like model that balances growth and defense depending on the plant’s developmental stage.
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来源期刊
Science Advances
Science Advances 综合性期刊-综合性期刊
CiteScore
21.40
自引率
1.50%
发文量
1937
审稿时长
29 weeks
期刊介绍: Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.
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