Photorespiration: The Futile Cycle?

Photorespiration: The Futile Cycle?
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DOI:
10.3390/plants10050908
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发表时间:
2021-05-01
期刊:
Plants (Basel, Switzerland)
影响因子:
--
通讯作者:
Bloom A
Bloom A
中科院分区:
其他
文献类型:
--
作者:
Shi X;Bloom A

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光呼吸,或C2光合作用,通常被认为是一个无效的循环,可能会减少光合固碳超过25%。然而,许多重要的过程,如氮同化,C1代谢和硫同化,依赖于光呼吸。大多数光合和光呼吸反应的研究都是以镁作为唯一的金属辅因子进行的,尽管参与这些反应的许多酶很容易与锰结合。事实上,当锰存在时,这些反应的能量效率可以提高。本文综述了一些常用的方法来量化光呼吸,概述了金属辅因子对光呼吸酶的影响,并讨论了为什么光呼吸可能不像以前认为的那样浪费。
Photorespiration, or C2 photosynthesis, is generally considered a futile cycle that potentially decreases photosynthetic carbon fixation by more than 25%. Nonetheless, many essential processes, such as nitrogen assimilation, C1 metabolism, and sulfur assimilation, depend on photorespiration. Most studies of photosynthetic and photorespiratory reactions are conducted with magnesium as the sole metal cofactor despite many of the enzymes involved in these reactions readily associating with manganese. Indeed, when manganese is present, the energy efficiency of these reactions may improve. This review summarizes some commonly used methods to quantify photorespiration, outlines the influence of metal cofactors on photorespiratory enzymes, and discusses why photorespiration may not be as wasteful as previously believed.
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