Abstract

Phytohormones salicylic acid and strigolactones play critical roles in mediating plant responses to environmental stress including drought stress. This study investigated whether foliar application of salicylic acid and strigolactones in the form of GR24 will improve the drought tolerance of winter wheat (T-riticum aestivum L.) plants. Exogenous application of strigolactone and salicylic acid increased proline and soluble sugar content as well as stomatal conductance, photosynthesis and transpiration rate of wheat plants. Higher amounts of all above mentioned characteristics are indicative of the higher drought tolerance of hormone-treated plants. In this experiment, application of hormones decreased the drought-induced rise in the content of H₂O₂ a factor known to lead to membrane lipid peroxidation, toxicity, and cell death. Hormones external application dampened leaf water potential that contributes to plant-level physiological drought tolerance. Drought tolerance features magnified when we used both hormones together. Our finding suggests that hormonal application can improve osmotic adjustment and decrease adverse effects of drought stress on wheat plants.

中文翻译：

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叶面施用GR24和水杨酸增强了小麦的耐旱性

摘要

植物激素水杨酸和松果内酯在介导植物对包括干旱胁迫在内的环境胁迫的响应中起关键作用。这项研究调查了叶面施用水杨酸和松香内酯（GR24）是否会提高冬小麦（T-riticum aestivum L.）植物的抗旱性。外源施用Strigolactone和水杨酸可提高小麦植株的脯氨酸和可溶性糖含量，以及气孔导度，光合作用和蒸腾速率。所有上述特征的量越高，表明激素处理的植物对干旱的耐受性越高。在该实验中，激素的施用减少了干旱引起的H ₂ O ₂含量的上升已知导致膜脂质过氧化，毒性和细胞死亡的因素。激素的外部施用削弱了叶片水势，有助于植物水平的生理干旱耐受性。当我们同时使用两种激素时，抗旱性会增强。我们的发现表明，激素的施用可以改善渗透调节并减少干旱胁迫对小麦植株的不利影响。