Yoshitake Yushi, Yoshimoto Kohki
Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Japan.
Front Plant Sci. 2023 Jan 17;13:1088211. doi: 10.3389/fpls.2022.1088211. eCollection 2022.
Phosphorus (P) is an essential nutrient for plant growth and plants use inorganic phosphate (Pi) as their P source, but its bioavailable form, orthophosphate, is often limited in soils. Hence, plants have several mechanisms for adaptation to Pi starvation. One of the most common response strategies is "Pi recycling" in which catabolic enzymes degrade intracellular constituents, such as phosphoesters, nucleic acids and glycerophospholipids to salvage Pi. Recently, several other intracellular degradation systems have been discovered that salvage Pi from organelles. Also, one of sphingolipids has recently been identified as a degradation target for Pi recycling. So, in this mini-review we summarize the current state of knowledge, including research findings, about the targets and degradation processes for Pi recycling under Pi starvation, in order to further our knowledge of the whole mechanism of Pi recycling.
磷（P）是植物生长必需的营养元素，植物以无机磷酸盐（Pi）作为磷源，但其生物可利用形式正磷酸盐在土壤中往往含量有限。因此，植物有多种适应磷饥饿的机制。最常见的响应策略之一是“磷循环利用”，即分解代谢酶降解细胞内成分，如磷酸酯、核酸和甘油磷脂以回收磷。最近，还发现了其他几种从细胞器中回收磷的细胞内降解系统。此外，一种鞘脂类物质最近被确定为磷循环利用的降解靶点。所以，在这篇小型综述中，我们总结了关于磷饥饿条件下磷循环利用的靶点和降解过程的当前知识状态，包括研究发现，以便进一步了解磷循环利用的整体机制。
