草业科学2025，Vol.42Issue(4)：991-999,9.DOI:10.11829/j.issn.1001-0629.2024-0045
外源腐胺对干旱胁迫下多年生黑麦草生长和光合作用的影响
Effects of exogenous putrescine on plant growth and photosynthesis of perennial ryegrass under drought stress
摘要
Abstract
Putrescine is crucial for plant growth and abiotic stress resistance.Here,the effects of exogenous putrescine and its synthetic inhibitors on seedlings growth and photosynthesis response were examined in perennial ryegrass(Lolium perenne,'Pinnacle Ⅲ')under drought stress.The results showed that drought stress inhibited the growth of perennial ryegrass,and exogenous 0.1 and 1 mmol·L-1 putrescine could alleviate the inhibition of drought stress on the seedlings of perennial ryegrass and 0.1 mmol·L-1 putrescine treatment has a better effect.Compared with those of the control,exogenous putrescine improved net photosynthetic rate(Pn),water use efficiency(WUE),and PS Ⅱ potential photochemical efficiency(Fv/Fo)and maximum photochemical quantum yield(Fv/Fm)of ryegrass,but decreased stomatal conductance(Gs),transpiration rate(Tr),intercellular carbon dioxide concentration(Ci),and relative conductivity(REC)under drought stress.Putrescine synthetic inhibitor ornithine decarboxylase inhibitor(DFMO)decreased the alleviation effect of putrescine.Summarily,our results indicate that 0.1 mmol·L-1 exogenous putrescine could alleviate the inhibition of drought stress on perennial ryegrass seedling growth,and improve its photosynthetic capacity and water use efficiency,thus enhancing the drought resistance of ryegrass.关键词
多年生黑麦草/腐胺/抗旱性/光合响应/水分利用效率/生长/生理机制Key words
perennial ryegrass/putrescine/drought tolerance/photosynthetic response/water use efficiency/plant growth/physiological mechanism引用本文复制引用
张金鹏,高士孔,于乔,赵奕帆,王宗森,高军军,郝小军,呼天明,付娟娟..外源腐胺对干旱胁迫下多年生黑麦草生长和光合作用的影响[J].草业科学,2025,42(4):991-999,9.基金项目
西北农林科技大学基本科研业务费专项(2452020161) （2452020161）
