数字农科院2.0

褪黑素对玉米幼苗根系发育和抗旱性的影响

文献类型: 中文期刊

关键词: 褪黑素 ;; 根系构型 ;; 抗氧化 ;; 光合作用 ;; 抗旱性

期刊名称:生物技术通报

ISSN: 1002-5464

年卷期: 2020 年

页码:

收录情况: 北大核心(2020版) ; CSCD(2020-2021年度) ; 农林核心(2020版) ; 科技核心(2020版)

摘要: 褪黑素是一种在生物体内广泛存在的吲哚胺类化合物, 参与植物的多种生理和生化过程。 近年来研究认为褪黑素 可以不同程度地增强植物的抗逆性, 但对其作用机理仍知之甚少。 本研究通过两种褪黑素的施用方法, 详细研究了褪黑素对于玉 米根系发育和抗旱性的影响。 首先, 采用水培根灌褪黑素的方法对玉米幼苗的根系和生长状况进行分析, 结果表明施加褪黑素显 著提高多种玉米幼苗根系参数, 包括根长, 根表面积, 根体积, 侧根数目等。 其次, 采用盆栽浸种褪黑素的方法, 对叶片相对含 水量、 光合作用、 抗氧化酶活性、 地上部分生物量等进行测定, 结果表明在干旱胁迫条件下, 褪黑素浸泡种子的处理方式能够提 高植株的光合速率、 气孔导度和蒸腾速率, 增强抗氧化酶活性以及降低活性氧和丙二醛含量。 本研究证明褪黑素促进植物根系发育, 减轻氧化损伤, 缓解光合抑制, 改善植物水分状况, 从而提高植物抗旱性。 本研究为褪黑素提高玉米抗旱性的作用提供了生理和 生化证据, 并为今后其在抗旱育种等相关领域的潜在应用提供了理论依据。

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