Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48823, USA.
Plant Resilience Institute, Michigan State University, East Lansing, MI 48824, USA.
Curr Biol. 2022 Oct 24;32(20):4493-4500.e4. doi: 10.1016/j.cub.2022.08.032. Epub 2022 Sep 7.
Elevated atmospheric CO enhances photosynthetic rate, thereby increasing biomass production in plants. Nevertheless, high CO reduces the accumulation of essential nutrients such as phosphorus (P), which are required for photosynthetic processes and plant growth. How plants ensure enhanced growth despite meager P status remains enigmatic. In this study, we utilize genome-wide association analysis in Arabidopsis thaliana to identify a P transporter, PHT4;3, which mediates the reduction of P in chloroplasts at high CO. Decreasing chloroplastic P fine-tunes the accumulation of a sugar-P metabolite, phytic acid, to support plant growth. Furthermore, we demonstrate that this adaptive mechanism is conserved in rice. Our results establish a mechanistic framework for sustainable food production against the backdrop of soaring CO levels across the world.
大气 CO 升高会提高植物的光合速率，从而增加生物量。然而，高浓度的 CO 会减少植物生长和光合作用所需的必需营养素（如磷）的积累。尽管磷元素含量低，但植物如何确保生长增强仍然是个谜。在这项研究中，我们利用拟南芥的全基因组关联分析鉴定出一种磷转运蛋白 PHT4;3，它介导了高 CO 条件下叶绿体中磷的减少。降低叶绿体中的磷可以精细调节糖磷代谢物植酸的积累，从而支持植物生长。此外，我们证明了这种适应性机制在水稻中是保守的。我们的研究结果为在全球 CO 水平飙升的背景下实现可持续的粮食生产提供了一个机制框架。
