College of Horticulture and Plant Protection, Yangzhou University , Yangzhou, China.
Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou, China.
Plant Signal Behav. 2020 Jul 2;15(7):1774714. doi: 10.1080/15592324.2020.1774714. Epub 2020 Jun 4.
has become an economically important oil crop in recent years, but its growth is seriously affected by drought stress in dry areas. In this study, the alleviating effect of fulvic acid (FA) on potted under natural drought stress was investigated. The natural drought stress adopted in this experiment was mainly characterized by the low soil water content, and the roots of plants cannot absorb enough water to compensate for the consumption of transpiration, which affects the normal physiological activities and causes damage. The results showed that FA treatment significantly increased the leaf water content and antioxidant enzyme activities and decreased reactive oxygen species (ROS) accumulation, the proline (Pro) content, and the relative electrical conductivity (REC). Moreover, FA treatment improved photosynthetic parameters and chlorophyll (Chl) fluorescence parameters, maintained the integrity of chloroplasts and mesophyll cells, and increased the expression level of drought-tolerant genes. These results indicated that FA treatment could induce antioxidant enzymes to eliminate ROS, reduce membrane lipid peroxidation and decrease damage to photosynthesis in under drought stress, which would provide a measure for alleviating the damage of caused by drought stress.
近年来，已经成为一种具有重要经济价值的油料作物，但在干旱地区，其生长受到干旱胁迫的严重影响。本研究探讨了腐植酸（FA）对盆栽条件下自然干旱胁迫下生长的缓解作用。本实验中采用的自然干旱胁迫主要表现为土壤含水量低，植物根系无法吸收足够的水分来补偿蒸腾作用的消耗，从而影响正常的生理活动并造成损害。结果表明，FA 处理显著提高了叶片的水分含量和抗氧化酶活性，降低了活性氧（ROS）的积累、脯氨酸（Pro）的含量和相对电导率（REC）。此外，FA 处理还改善了光合作用参数和叶绿素（Chl）荧光参数，维持了叶绿体和叶肉细胞的完整性，并提高了耐旱基因的表达水平。这些结果表明，FA 处理可以诱导抗氧化酶消除 ROS，减少膜脂过氧化作用，降低干旱胁迫对光合作用的损害，为缓解干旱胁迫对造成的损害提供了一种措施。
