Yan Shengjie, Zhan Meng, Liu Zhi, Zhang Xianwen
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
Biochimie. 2025 Jan;228:8-14. doi: 10.1016/j.biochi.2024.08.006. Epub 2024 Aug 8.
Proline biosynthesis and catabolism pathways are executed by powerful action of specific enzymes that are subjected to environmental fluctuations at the transcriptional level. Previous researches have demonstrated that osmotic stress-induced upstream events can affect the expression of proline metabolism-related genes, which results in adjustable free proline accumulation to protect plant cells from severe damage. Here, we mainly describe the mechanisms for how some key factors, such as transcription factors, ABA (abscisic acid), Ca, MAPK cascades, CK (cytokinin) and phospholipase, in a phosphorylated manner, vividly function in the transcriptional regulation of proline metabolism under osmotic stress. These mechanisms reveal that sustaining of proline homeostasis is an efficient way for plants to adapt to osmotic stress.
脯氨酸的生物合成和分解代谢途径由特定酶的强大作用执行，这些酶在转录水平上受到环境波动的影响。先前的研究表明，渗透胁迫诱导的上游事件可影响脯氨酸代谢相关基因的表达，从而导致游离脯氨酸积累量可调节，以保护植物细胞免受严重损伤。在此，我们主要描述了一些关键因子，如转录因子、脱落酸（ABA）、钙、丝裂原活化蛋白激酶（MAPK）级联、细胞分裂素（CK）和磷脂酶，如何以磷酸化的方式在渗透胁迫下脯氨酸代谢的转录调控中发挥作用。这些机制表明，维持脯氨酸稳态是植物适应渗透胁迫的有效方式。
