Acclimation to high-light conditions in cyanobacteria: from gene expression to physiological responses
Acclimation to high-light conditions in cyanobacteria: from gene expression to physiological responses
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DOI：
10.1007/s10265-011-0454-6
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发表时间：
2012-01-01
影响因子：
2.8
通讯作者：
Hihara, Yukako
中科院分区：
文献类型：
--
作者：
Muramatsu, Masayuki;Hihara, Yukako
光合生物已经进化出各种适应高光（HL）条件的反应，以维持能量供应（光收集和电子传递）和消耗（细胞代谢）之间的平衡，并保护光合机构免受光损伤。单细胞蓝藻藻（synnechocystis sp. PCC 6803）对HL驯化的分子机制进行了广泛的研究。全基因组DNA微阵列分析显示，高低温条件下基因表达谱的变化与随后的适应反应密切相关，如：(1)光系统II更新速度加快，(2)光收集能力下调，(3)光系统对过量光能的保护机制的建立，(4)一般保护机制成分的上调，以及(5)碳氮同化的调节。本文综述了近年来国内外对聚囊藻（Synechocystis sp. PCC 6803）这些同化反应的分子机制的研究进展。我们也简要地描述了尝试了解HL驯化在各种蓝藻物种在其自然环境。
Photosynthetic organisms have evolved various acclimatory responses to high-light (HL) conditions to maintain a balance between energy supply (light harvesting and electron transport) and consumption (cellular metabolism) and to protect the photosynthetic apparatus from photodamage. The molecular mechanism of HL acclimation has been extensively studied in the unicellular cyanobacterium Synechocystis sp. PCC 6803. Whole genome DNA microarray analyses have revealed that the change in gene expression profile under HL is closely correlated with subsequent acclimatory responses such as (1) acceleration in the rate of photosystem II turnover, (2) downregulation of light harvesting capacity, (3) development of a protection mechanism for the photosystems against excess light energy, (4) upregulation of general protection mechanism components, and (5) regulation of carbon and nitrogen assimilation. In this review article, we survey recent progress in the understanding of the molecular mechanisms of these acclimatory responses in Synechocystis sp. PCC 6803. We also briefly describe attempts to understand HL acclimation in various cyanobacterial species in their natural environments.