中国农业科技导报2025，Vol.27Issue(4)：36-44,9.DOI:10.13304/j.nykjdb.2023.0876
ABA缓解谷子幼苗干旱胁迫生理特性分析
Analysis of Physiological Characteristics About ABA Alleviating Foxtail Millet Seedling Stage Under Drought Stress
摘要
Abstract
In order to study the effects of drought stress on physiological characteristics of foxtail millet at seedling stage and the alleviating effect of exogenous abscisic acid(ABA),different drought tolerant foxtail millet varieties Jigu 22 and Lugu 1 were used as materials to conduct pot experiment.The effects of 20%PEG6000 simulated dehydration stress at seedling stage and spraying 0.1 mmol L-1 ABA on morphological character,activities of antioxidant enzymes and ascorbate peroxidase(APX),contents of malondialdehyd(MDA),proline(Pro),soluble sugar(SS)and soluble protein(SP)in 2 different foxtail millet varieties were analyzed.The results showed that the relative seedling height of Jigu 22 after drought stress for 4 d was 81.49%,which was higher than that of Lugu 1.MDA content in leaves of the 2 varieties increased after drought stress.On the 7th day of stress,MDA content in Jigu 22 increased by 3.03%,and that in Lugu 1 increased by 33.61%compared with control.The MDA content was significantly reduced after application of exogenous ABA.Exogenous ABA promoted the activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and APX.Osmotic adjustment substances Pro,SS and SP were synthesized in large amounts to maintain osmoregulation and alleviate the damage of drought stress on foxtail millet seedlings.The effect of exogenous ABA on the drought-tolerant variety Jigu 22 was more obvious under drought stress.The effect of exogenous ABA on Lugu 1 was relatively weak,especially on the 7th day of drought stress,and the physiological and growth characteristics recovered slowly.In summary,ABA could effectively alleviate the damage of physiological function and the effect of drought stress on seedling growth of foxtail millet.Different drought resistance varieties foxtail millet had different sensitivity to ABA.The varieties with strong drought resistance were more sensitive to ABA,the mitigation effect of ABA on drought was more obvious.Above results provided theoretical bases for revealing the physiological mechanism of foxtail millet response to drought stress and the application of exogenous ABA.关键词
谷子/干旱胁迫/脱落酸/生理特性Key words
foxtail millet/drought stress/abscisic acid/physiological characteristics分类
农业科技引用本文复制引用
秦岭,王艳珂,陈二影,杨延兵,黎飞飞,张梦媛,管延安..ABA缓解谷子幼苗干旱胁迫生理特性分析[J].中国农业科技导报,2025,27(4):36-44,9.基金项目
国家谷子高粱产业技术体系建设项目(CARS-06-14.5-A19) （CARS-06-14.5-A19）
山东省重点研发计划项目(2022TZXD0029) （2022TZXD0029）
山东省自然科学基金项目(ZR2022MC052). （ZR2022MC052）
