Li Xiaolan, Liu Hanghang, He Cai, Li Yi
College of Forestry, Gansu Agricultural University, Lanzhou 730070, China.
Plants (Basel). 2025 Aug 25;14(17):2643. doi: 10.3390/plants14172643.
Drought stress caused by continuous global warming poses a severe challenge to the growth and development of . Abscisic acid has an important regulatory function in the process of plants responding to drought stress. This study took the seedlings of Zhangye provenance 2-17-16 genealogy as the research object to explore the physiological mechanism of how different concentrations of exogenous ABA alleviate drought damage in . The results showed that exogenous ABA could promote the growth and increase the leaf relative water content of seedlings under drought stress. It alleviates the photosynthetic inhibition phenomenon of seedlings under drought stress by regulating the photoprotective mechanism and energy distribution efficiency of photosystem II. It also alleviates the drought damage of by increasing the content of osmotic-adjustment substance contents such as soluble sugar, soluble protein, proline, and starch, as well as enhancing the activity of antioxidant enzymes such as POD, SOD, and CAT. The comprehensive analysis showed that 20 μM and 30 μM ABA have the best alleviating effects on the drought damage of seedlings. This study provides a theoretical basis for the restoration, propagation, and protection of , and it is of great significance for maintaining the balance and stability of desert ecosystems.
持续全球变暖导致的干旱胁迫对[植物名称]的生长发育构成严峻挑战。脱落酸在植物应对干旱胁迫过程中具有重要调控作用。本研究以张掖种源2-17-16谱系的[植物名称]幼苗为研究对象，探讨不同浓度外源脱落酸缓解[植物名称]干旱伤害的生理机制。结果表明，外源脱落酸可促进干旱胁迫下[植物名称]幼苗生长并提高叶片相对含水量。通过调节光系统II的光保护机制和能量分配效率，缓解干旱胁迫下[植物名称]幼苗的光合抑制现象。还通过增加可溶性糖、可溶性蛋白、脯氨酸和淀粉等渗透调节物质含量，以及增强过氧化物酶（POD）、超氧化物歧化酶（SOD）和过氧化氢酶（CAT）等抗氧化酶活性，缓解[植物名称]的干旱伤害。综合分析表明，20μM和30μM脱落酸对[植物名称]幼苗干旱伤害的缓解效果最佳。本研究为[植物名称]的恢复、繁殖和保护提供了理论依据，对维持沙漠生态系统的平衡与稳定具有重要意义。
