A scheme for C4 evolution derived from a comparative analysis of the closely related C3, C3-C4 intermediate, C4-like, and C4 species in the genus Flaveria
A scheme for C4 evolution derived from a comparative analysis of the closely related C3, C3-C4 intermediate, C4-like, and C4 species in the genus Flaveria
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通过对黄花属中密切相关的 C3、C3-C4 中间体、C4 样和 C4 物种的比较分析得出的 C4 进化方案
DOI：
10.1007/s11103-022-01246-z
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发表时间：
2022
影响因子：
5.1
通讯作者：
Taniguchi Yukimi Y.
中科院分区：
文献类型：
--
作者：
Munekage Yuri N.;Taniguchi Yukimi Y.
通过对flaveria属的比较分析，揭示了一个c4进化过程，在c3 - c4中间阶段逐渐获得c4光合作用的解剖和代谢特征。摘要被子植物在进化过程中具有抑制光呼吸的光合作用。进行c4光合作用的作物即使在高温半干旱环境下也表现出高的二氧化碳同化率和高的粮食产量；因此，c3植物的c4光合作用工程化在应用领域具有重要意义。flaveriia属含有大量的C3、C3 - c4中间体、c4样和c4种，是研究c4光合作用进化的良好模式属，为c4工程指明了方向。c4光合作用通过c3 - c4中间阶段逐渐获得。首先，通过在束鞘细胞的线粒体中定位甘氨酸脱羧酶活性，获得了称为c2光合作用的两细胞C2cycle。随着双细胞代谢的发展，解剖特征也发生了变化。接下来，在c3 - c4中间阶段，通过细胞选择性表达和C4cycle中酶的上调，诱导双细胞C2cycle被双细胞C4cycle取代。这得到了循环电子传递活性增加的支持，这是对ATP/NADPH代谢需求增加的反应。叶肉细胞c3循环的抑制是在c4循环的功能建立后诱导的，通过抑制光系统II的活性来优化电子传递也发生在c4进化的最后阶段。
Key messageA comparative analysis of the genusFlaveriashowed a C4evolutionary process in which the anatomical and metabolic features of C4photosynthesis were gradually acquired through C3–C4intermediate stages.AbstractC4photosynthesis has been acquired in multiple lineages of angiosperms during evolution to suppress photorespiration. Crops that perform C4photosynthesis exhibit high rates of CO2assimilation and high grain production even under high-temperature in semiarid environments; therefore, engineering C4photosynthesis in C3plants is of great importance in the application field. The genusFlaveriacontains a large number of C3, C3–C4intermediate, C4-like, and C4species, making it a good model genus to study the evolution of C4photosynthesis, and these studies indicate the direction for C4engineering. C4photosynthesis was acquired gradually through the C3–C4intermediate stage. First, a two-celled C2cycle called C2photosynthesis was acquired by localizing glycine decarboxylase activity in the mitochondria of bundle sheath cells. With the development of two-cell metabolism, anatomical features also changed. Next, the replacement of the two-celled C2cycle by the two-celled C4cycle was induced by the acquisition of cell-selective expression in addition to the upregulation of enzymes in the C4cycle during the C3–C4intermediate stage. This was supported by an increase in cyclic electron transport activity in response to an increase in the ATP/NADPH demand for metabolism. Suppression of the C3cycle in mesophyll cells was induced after the functional establishment of the C4cycle, and optimization of electron transport by suppressing the activity of photosystem II also occurred during the final phase of C4evolution.