Low-Temperature Adaptation of the Snow AlgaChlamydomonas nivalisIs Associated With the Photosynthetic System Regulatory Process
Low-Temperature Adaptation of the Snow AlgaChlamydomonas nivalisIs Associated With the Photosynthetic System Regulatory Process
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雪藻衣藻的低温适应与光合系统调节过程有关
DOI：
10.3389/fmicb.2020.01233
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发表时间：
2020-06-10
影响因子：
5.2
通讯作者：
Wang, Qiang
中科院分区：
文献类型：
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作者：
Zheng, Yanli;Xue, Chunling;Wang, Qiang
雪藻衣藻在极地雪原和高海拔山顶上繁衍生息，对极地地区的初级生产做出了重大贡献，然而，这种适应低温的机制尚不清楚。在这里，我们比较了C.的生长、光合活性、膜脂过氧化和抗氧化活性。 nivalis 与模型藻C 的那些。莱茵衣，在生长温度和低温下。C.在这些条件下，雪霉通过降低光系统 II 的光捕获能力并增强光系统 I 周围的循环电子转移来维持其光合活性，这两者都限制了过量光能对光系统的损害，并导致 ATP 产生，支持细胞生长和其他生理过程。此外，循环电子转移速率、类胡萝卜素含量和抗氧化酶活性的增加共同调节了C中的活性氧水平。 nivalis，能够从过量的激发能量中恢复并减少对细胞的光氧化损伤。因此，我们提出了一个模型，其中与光合调节相关的适应性机制促进了C.的存活甚至开花。雪崩处于极地环境下，表明C. nivaliscan 为极地地区其他周围生物提供有机碳源，作为维持生态系统的重要初级生产者。
The algaChlamydomonas nivalisthrives in polar snow fields and on high-altitude mountain tops, and contributes significantly on primary production in the polar regions, however, the mechanisms underlying this adaptation to low temperatures are unknown. Here, we compared the growth, photosynthetic activity, membrane lipid peroxidation, and antioxidant activity ofC. nivaliswith those of the model algaC. reinhardtii, under grow temperature and low temperatures.C. nivalismaintained its photosynthetic activity in these conditions by reducing the light-harvesting ability of photosystem II and enhancing the cyclic electron transfer around photosystem I, both of which limited damage to the photosystem from excess light energy and resulted in ATP production, supporting cellular growth and other physiological processes. Furthermore, the increased cyclic electron transfer rate, carotenoid content, and antioxidant enzyme activities jointly regulated the reactive oxygen species levels inC. nivalis, enabling recovery from excess excitation energy and reduced photooxidative damage to the cell. Therefore, we propose a model in which adaptive mechanisms related to photosynthetic regulation promote the survival and even blooming ofC. nivalisunder polar environment, suggesting thatC. nivaliscan provide organic carbon sources as an important primary producer for other surrounding life in the polar regions for maintaining ecosystem.