草业科学2025，Vol.42Issue(1)：140-151,12.DOI:10.11829/j.issn.1001-0629.2023-0577
油菜素内脂对干旱胁迫下护坡植物高羊茅生理特性的调控效应
Regulatory effects of brassinolide on the physiological characteristics of Festuca arundinacea,a slope protection plant,under drought stress
摘要
Abstract
Tall fescue(Festuca arundinacea)was used as experimental material in this study to explore the mechanism by which brassinolide enhances its drought resistance when grown in vegetation concrete under drought stress.A pot experiment was conducted to investigate the effects of brassinolide on plant height,biomass,photosynthetic characteristics,and certain osmotic adjustment substances and antioxidants of tall fescue under drought stress by setting treatments with three water gradients(well water,mild drought,and severe drought)and four concentrations of brassinolide(0,0.05,0.2,and 0.5 mg·L-1).The results showed that the growth of tall fescue was inhibited,and the physiological performance decreased with the aggravation of drought stress and prolongation of stress time in vegetation concrete.Brassinolide treatment significantly increased(P＜0.05)the plant height,biomass,net photosynthetic rate,transpiration rate,stomatal conductance,and proline content of tall fescue under drought stress,reduced the intercellular CO2 concentration and malondialdehyde content in the leaves of tall fescue,effectively improved the drought resistance of tall fescue grown in vegetation concrete,and had a significant concentration effect.Spraying 0.2 mg·L-1 brassinolide under normal water and mild drought stress had the best effect on the growth of tall fescue,while spraying 0.05 mg·L-1 brassinolide under severe drought stress had the best effect.This preliminary study revealed the effect of brassinolide on the physiological characteristics of tall fescue under drought stress,providing a research basis for using the exogenous phytohormone brassinolide in the ecological slope restoration of vegetation concrete.关键词
干旱胁迫/植被混凝土/油菜素内酯/高羊茅/光合特性/渗透调节/边坡修复Key words
drought stress/vegetation concrete/brassinolide/tall fescue/photosynthetic properties/osmoregulatory substance/slope restoration引用本文复制引用
李铭怡,贾濠基,董文豪,郭士维,王福豪,刘黎明,夏栋,许文年..油菜素内脂对干旱胁迫下护坡植物高羊茅生理特性的调控效应[J].草业科学,2025,42(1):140-151,12.基金项目
国家自然科学基金项目(42207544) （42207544）
水泥基生态修复技术湖北省工程研究中心开放基金项目(2022SNJ09) （2022SNJ09）
