School of Life Sciences, B. S. Abdur Rahman Crescent Institute of Science and Technology, Chennai, TN, India.
Appl Biochem Biotechnol. 2022 Nov;194(11):5353-5366. doi: 10.1007/s12010-022-04032-1. Epub 2022 Jun 30.
Saline stress is the most limiting condition impacting the plant growth, development, and productivity. In this present study, jasmonic acid (JA) was used as a foliar spray on the rice seedlings grown under saline stress. Increase in photosynthetic pigments, anthocyanin, and total protein content was observed with JA treatment while NaCl showed reduction in biochemical constituents and enhanced antioxidant enzyme activity. The leaf cells of NaCl-treated seedlings accumulated more ROS and had more fragmented nuclei, whereas JA decreased the accumulation and fragmentation during saline stress. In NaCl treatment, gene expression analysis showed many fold upregulation in comparison with other treatments. The results suggest that JA acts as a promoter for growth, physiological, biochemical, and cellular contents, as well as ameliorate the effects of saline stress. The expression of genes demonstrated that saline stress may promote autophagy, which leads to autophagic cell death, and improve tolerance to saline stress in rice seedlings via the jasmonic acid signaling pathway. However, the mechanism by which jasmonate signaling induces autophagy and cell death is unknown and requires further exploration.
盐胁迫是影响植物生长、发育和生产力的最具限制性条件。在本研究中，茉莉酸（JA）被用作叶面喷施在盐胁迫下生长的水稻幼苗上。用 JA 处理后，观察到光合色素、花青素和总蛋白质含量增加，而 NaCl 则降低了生化成分并增强了抗氧化酶活性。NaCl 处理的幼苗叶片细胞中 ROS 积累更多，核片段化更多，而 JA 在盐胁迫下减少了 ROS 的积累和核片段化。在 NaCl 处理中，与其他处理相比，基因表达分析显示出多倍上调。结果表明，JA 作为生长、生理、生化和细胞内容的促进剂，以及改善盐胁迫的影响。基因表达表明，盐胁迫可能通过茉莉酸信号通路促进自噬，导致自噬细胞死亡，并提高水稻幼苗对盐胁迫的耐受性。然而，茉莉酸信号诱导自噬和细胞死亡的机制尚不清楚，需要进一步探索。
