Department of Horticultural Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran.
Department of Biology, Faculty of Basic Science, Bu-Ali Sina University, Hamedan, Iran.
Funct Plant Biol. 2024 Oct;51. doi: 10.1071/FP24059.
Drought-induced stress represents one of the most economically detrimental natural phenomena impacting grapevine (Vitis vinifera ) development, yield, and fruit characteristics. Also, auxin is one of the most important plant growth regulators that can reduce damage caused by stress in plants. In this study, the impact of exogenously sprayed auxin (0, 50, and 200mgL-1 ) on growth, biochemical, and anatomical parameters was investigated in two grapevine varieties (cvs. 'Rashe' and 'Fakhri') under water deficit. According to our findings, water deficit led to a notable decrease in growth, protein content, and anatomical parameters; but significantly enhanced electrolyte leakage. Grapevines exposed to water deficit exhibited substantial increases in total phenolic compounds and antioxidant activity. Applying 50mgL-1 napthalene acetic acid (NAA) reduced the effects of water deficit in both grapevine cultivars by decreasing electrolyte leakage (15% in 'Rashe' and 20% in 'Fakhri'), and accumulating protein content (22% 'Rashe' and 32% 'Fakhri'), total phenolic compounds (33%'Rashe' and 40% 'Fakhri'), and antioxidant capacity (11% 'Rashe' and 39% 'Fakhri'); anantomical parameters were also improved. However, application of 200mgL-1 NAA had adverse effects on growth and biochemical traits of grapevines, with a more pronounced impact on root growth and anatomical parameters compared to other NAA concentrations. In conclusion, the application of 50mgL-1 NAA enhanced grapevine growth, enabling them to better thrive under water deficit.
干旱胁迫是影响葡萄（Vitis vinifera）生长、产量和果实特性的最具经济破坏性的自然现象之一。此外，生长素是最重要的植物生长调节剂之一，它可以减轻植物受到的胁迫伤害。本研究在水分亏缺条件下，研究了外源喷施生长素（0、50 和 200mgL-1）对两个葡萄品种（‘Rashe’和‘Fakhri’）生长、生化和解剖参数的影响。根据我们的发现，水分亏缺导致生长、蛋白质含量和解剖参数明显下降，但显著增强了电解质渗漏。水分亏缺下的葡萄显著增加了总酚类化合物和抗氧化活性。施加 50mgL-1萘乙酸（NAA）通过降低电解质渗漏（‘Rashe’减少 15%，‘Fakhri’减少 20%）和积累蛋白质含量（‘Rashe’增加 22%，‘Fakhri’增加 32%）、总酚类化合物（‘Rashe’增加 33%，‘Fakhri’增加 40%）和抗氧化能力（‘Rashe’增加 11%，‘Fakhri’增加 39%），减轻了两种葡萄品种的水分亏缺效应；解剖参数也得到了改善。然而，施加 200mgL-1 NAA 对葡萄的生长和生化特性产生了不利影响，与其他 NAA 浓度相比，对根生长和解剖参数的影响更为显著。总之，施加 50mgL-1 NAA 增强了葡萄的生长，使其在水分亏缺下更好地生长。
