Strategies for adaptation to high light in plants

IF 4.6 4区 农林科学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Man Zhang, Yu Ming, Hong-Bin Wang, Hong-Lei Jin
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引用次数: 0

Abstract

Plants absorb light energy for photosynthesis via photosystem complexes in their chloroplasts. However, excess light can damage the photosystems and decrease photosynthetic output, thereby inhibiting plant growth and development. Plants have developed a series of light acclimation strategies that allow them to withstand high light. In the first line of defense against excess light, leaves and chloroplasts move away from the light and the plant accumulates compounds that filter and reflect the light. In the second line of defense, known as photoprotection, plants dissipate excess light energy through non-photochemical quenching, cyclic electron transport, photorespiration, and scavenging of excess reactive oxygen species. In the third line of defense, which occurs after photodamage, plants initiate a cycle of photosystem (mainly photosystem II) repair. In addition to being the site of photosynthesis, chloroplasts sense stress, especially light stress, and transduce the stress signal to the nucleus, where it modulates the expression of genes involved in the stress response. In this review, we discuss current progress in our understanding of the strategies and mechanisms employed by plants to withstand high light at the whole-plant, cellular, physiological, and molecular levels across the three lines of defense.

植物适应强光的策略
植物通过叶绿体中的光合系统复合体吸收光能进行光合作用。然而,过强的光照会损坏光合系统,降低光合作用的输出,从而抑制植物的生长和发育。植物已经开发出一系列光适应策略,使它们能够抵御强光。在抵御强光的第一道防线中,叶片和叶绿体会远离光线,植物会积累过滤和反射光线的化合物。在被称为光保护的第二道防线中,植物通过非光化学淬灭、循环电子传递、光呼吸和清除过量活性氧来消散多余的光能。在光损伤后的第三道防线中,植物会启动一个光系统(主要是光系统 II)修复循环。叶绿体除了是光合作用的场所外,还能感知应激,尤其是光应激,并将应激信号转导到细胞核,从而调节参与应激反应的基因的表达。在这篇综述中,我们将讨论目前在理解植物抵御强光的策略和机制方面所取得的进展,这些策略和机制涉及整个植物、细胞、生理和分子水平的三道防线。
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
CiteScore
7.70
自引率
2.80%
发文量
0
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