脱落酸通过SnRK2和ABI3促进了假丝胞的非光化学猝灭。

IF 2.7 3区 生物学 Q2 PLANT SCIENCES
Chang-Hyun Maeng, Takuya Fujita, Junko Kishimoto, Ryouichi Tanaka, Atsushi Takabayashi, Tomomichi Fujita
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引用次数: 0

摘要

苔藓植物时期绿色植物从水生环境向陆生环境的过渡是植物进化的一个关键时期。成功的陆地化需要进化适应恶劣和波动的光照条件,那里的直接照射比水生环境更强。为了应对这些挑战,植物进化出了调控机制来控制细胞活动。其中一种驯化是快速可逆的,能量依赖的非光化学猝灭(NPQ),它将多余的光能作为热量消散,以保护光合装置。另一个重要的创新是脱落酸(ABA)信号,据信它首先出现在苔藓植物中。在这里,我们揭示了苔藓植物中这两个关键驯化之间的潜在联系。我们证明外源ABA诱导苔藓壶菌NPQ,增加LHCSR (NPQ的关键调节因子)的水平,同时降低PsbS。外源ABA也增强了叶黄素循环色素,促进了NPQ。在缺乏ABA信号成分的突变体中,包括snf1相关激酶2 (SnRK2)和转录因子,脱落酸不敏感3 (ABI3), ABA诱导的NPQ, LHCSR和PsbS表达以及叶黄素循环色素积累显著减少。这些研究结果表明,外源ABA通过SnRK2和abi3介导的信号通路,通过促进LHCSR表达和叶黄素循环色素的生成来增强NPQ。我们认为ABA信号和NPQ的整合代表了一个关键的进化里程碑,使早期陆地植物能够适应并在陆地环境中茁壮成长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Abscisic acid enhances non-photochemical quenching through SnRK2 and ABI3 in Physcomitrium patens.

The transition of plants in the green lineage from aquatic to terrestrial environments during the bryophyte stage marked a pivotal point in evolution. Successful terrestrialization required evolutionary adaptations to harsh and fluctuating light conditions, where direct irradiation is stronger than in aquatic environments. To cope with these challenges, plants evolved regulatory mechanisms to control cellular activities. One such acclimation is rapidly reversible, energy-dependent non-photochemical quenching (NPQ), which dissipates excess light energy as heat to protect the photosynthetic apparatus. Another critical innovation is abscisic acid (ABA) signaling, believed to have first emerged in bryophytes. Here, we reveal a potential link between these two key acclimations in bryophytes. We demonstrate that exogenous ABA induces NPQ in the moss Physcomitrium patens, increasing the levels of LHCSR, a key NPQ regulator, while concurrently decreasing PsbS. Exogenous ABA also enhances the xanthophyll cycle pigments, contributing to NPQ. In mutants deficient in ABA signaling components, including SNF1-related kinase 2 (SnRK2) and the transcription factor, Abscisic Acid-Insensitive 3 (ABI3), ABA-induced NPQ, LHCSR and PsbS expression, and xanthophyll cycle pigment accumulation were significantly reduced. These findings suggest that exogenous ABA enhances NPQ through the SnRK2 and ABI3-mediated signaling pathway by promoting LHCSR expression and xanthophyll cycle pigment production. We propose that the integration of ABA signaling and NPQ represent a critical evolutionary milestone, enabling early land plants to adapt and thrive in terrestrial environments.

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来源期刊
Journal of Plant Research
Journal of Plant Research 生物-植物科学
CiteScore
5.40
自引率
3.60%
发文量
59
审稿时长
1 months
期刊介绍: The Journal of Plant Research is an international publication that gathers and disseminates fundamental knowledge in all areas of plant sciences. Coverage extends to every corner of the field, including such topics as evolutionary biology, phylogeography, phylogeny, taxonomy, genetics, ecology, morphology, physiology, developmental biology, cell biology, molecular biology, biochemistry, biophysics, bioinformatics, and systems biology. The journal presents full-length research articles that describe original and fundamental findings of significance that contribute to understanding of plants, as well as shorter communications reporting significant new findings, technical notes on new methodology, and invited review articles.
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