Manganese binding to Rubisco could drive a photorespiratory pathway that increases the energy efficiency of photosynthesis
Manganese binding to Rubisco could drive a photorespiratory pathway that increases the energy efficiency of photosynthesis
复制标题
DOI：
10.1038/s41477-018-0191-0
复制
发表时间：
2018-07-01
期刊：
影响因子：
18
通讯作者：
Lancaster, Kyle M.
中科院分区：
文献类型：
--
作者：
Bloom, Arnold J.;Lancaster, Kyle M.
与普遍认为的相反，大多数植物在称为光呼吸的无用循环中不会浪费超过30%的光合作用。相反，光呼吸途径在叶绿体中产生额外的苹果酸，从而为许多能量密集型化学反应提供动力，例如参与硝酸盐同化的化学反应。因此，固碳和光呼吸之间的平衡决定了植物的碳氮平衡和蛋白质浓度。反过来，植物蛋白质浓度不仅取决于叶绿体中二氧化碳和氧气的相对浓度，还取决于镁和锰的相对活性，这两种金属与光呼吸途径中的几个关键酶有关，并改变其功能。了解这些过程的调控对于在不断上升的二氧化碳大气中维持食品质量至关重要。
Most plants, contrary to popular belief, do not waste over 30% of their photosynthate in a futile cycle called photorespiration. Rather, the photorespiratory pathway generates additional malate in the chloroplast that empowers many energy-intensive chemical reactions, such as those involved in nitrate assimilation. Thus, the balance between carbon fixation and photorespiration determines the plant carbon-nitrogen balance and protein concentrations. Plant protein concentrations, in turn, depend not only on the relative concentrations of carbon dioxide and oxygen in the chloroplast but also on the relative activities of magnesium and manganese, which are metals that associate with several key enzymes in the photorespiratory pathway and alter their function. Understanding the regulation of these processes is critical for sustaining food quality under rising CO2 atmospheres.