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Function and evolution of grana

机译:燕麦的功能与进化

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Chloroplasts are descended from cyanobacteria, and they retain many features of the cyanobacterial photosynthetic apparatus. However, land-plant chloroplasts have a strikingly different thylakoid membrane organization to that of cyanobacteria. Usually the two photosystems are laterally segregated; Photosystem II is concentrated in complex stacked-membrane structures known as grana. The function of grana has long been debated. Recent studies on membrane organization in chloroplasts, cyanobacteria and purple bacteria now offer a new perspective. I argue that grana allow the presence of a large light-harvesting antenna for Photosystem II, without excessively restricting electron transport. Other organisms solve this problem in different ways. Land plants evolved from macroalgae that were adapted to high light conditions; they evolved grana as a new solution to the problem of efficient photosynthesis in shade.
机译:叶绿体来自蓝细菌,它们保留了蓝细菌光合装置的许多特征。然而,陆地植物叶绿体的类囊体膜组织与蓝细菌截然不同。通常,两个光系统在侧面是分开的。光系统II集中在称为Grana的复杂堆叠膜结构中。格拉纳的功能长期以来一直存在争议。对叶绿体,蓝细菌和紫色细菌中的膜组织的最新研究现在提供了新的观点。我认为,格兰娜娜允许在Photosystem II中使用大型光收集天线,而不会过度限制电子传输。其他生物以不同的方式解决了这个问题。陆地植物是从大型藻类进化而来的,适合于强光条件;他们开发了谷物作为新的解决方案,以有效地在阴影下进行光合作用。

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