Plant hormones play an essential role in the regulation of leaf senescence in crops. However, limited information is known about the effects of plant hormones on the growth and development of rice plants with leaf early senescence. This study used a leaf early-senescent rice mutant (osled) and its wild type as materials and chiefly investigated how exogenous plant hormones, including indole-3-acetic acid (IAA), trans-zeatin (Z), gibberellic acid (GA3), and 24-epicastasterone (24-epiCS), influenced the main agronomic and physiological performance of the osled. The results showed, compared with the control (CK, spraying deionized water), IAA, Z, and 24-epiCS treatments respectively increased the grain yield of the osled plants by 9.73%, 28.1% and 10.3%, while GA3 treatment significantly reduced that of the osled plants. The IAA, Z, and 24-epiCS treatments obviously delayed leaf senescence and reduced the yield loss of the osled plants by improving crop growth rate, leaf function, and root activity and enhancing the remobilization and contribution of non-structural carbohydrates from stems to grains. Additionally, Z treatment had the best effect in delaying leaf senescence and decreasing yield loss of the osled plants, GA3 treatment promoted a faster growth of rice plants at the early stage, and 24-epiCS treatment inhibited tiller occurrence of the osled plants. The results verify that exogenous plant hormones are applicable to regulate leaf senescence and grain yield of the osled plants, and simultaneously enrich their responses to various hormones in the aspects of agronomic and physiological performance.

中文翻译：

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外源植物激素对水稻叶片早衰突变体osled农艺和生理性能的影响

植物激素在作物叶片衰老的调控中起重要作用。然而，关于植物激素对叶片早衰的水稻植株生长发育影响的信息有限。本研究以水稻叶片早衰突变体（osled）及其野生型为材料，主要研究外源植物激素，包括吲哚-3-乙酸（IAA）、反式玉米素（Z）、赤霉酸（GA3）和 24-epicastasterone (24-epiCS)，影响了雪橇犬的主要农艺和生理性能。结果表明，与对照（CK，喷去离子水）相比，IAA、Z和24-epiCS处理分别使osled植株的籽粒产量提高了9.73%、28.1%和10.3%，而GA3处理显着降低了产量。 osled 植物。IAA, Z, 和 24-epiCS 处理通过提高作物生长速度、叶功能和根系活性，增强非结构性碳水化合物从茎到谷粒的再动员和贡献，明显延迟了叶片衰老并减少了 osled 植物的产量损失。此外，Z处理延迟叶衰老和减少osled植株产量损失的效果最好，GA3处理促进水稻早期快速生长，24-epiCS处理抑制了osled植株分蘖的发生。结果验证了外源植物激素适用于调节雪梨植物的叶片衰老和籽粒产量，同时在农艺和生理性能方面丰富了它们对各种激素的反应。