外源脯氨酸对干旱胁迫下小麦幼苗光合特性及保护性酶系统的影响

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中图分类号 S512 文献标识码A 文章编号 1007-7731(2025)14-0020-04

DOI号 10.16377/j.cnki.issn1007-7731.2025.14.005

Effects of exogenous proline on photosynthetic characteristics and protective enzyme system of wheat seedlings under drought stress

XU Yanna MENG Xue WANG Yanmin XU Zhuanzhi （Shangqiu Academy of Agriculture and Forestry Sciences,Shangqiu 476oo0, China)

AbstractTo investigate theallviating efect of exogenousprolineondrought stress inwheat seedlings，wheat variety Jimai 22 was used as the experimental material, with CK and blank control set up; T1, 15% PEG-6000；T2, 15% PEG-6000+10 mmol/L proline; T3, 15% PEG-6000+30 mmol/L proline; T4, 15% PEG-6000+60 mmol/L proline, 5treatments were used tostudythe effects of different concentrationsof prolineonphotosyntheticpigments, photosynthetic characteristics,and protective enzyme systems of wheat seedlings under drought stressThe results showedthat drought stressreduced the chlorophyll content,net photosyntheticrate,and protectiveenzymeactivityof wheat seedling leaves;thecontentof chlorophylla,chlorophyllb,chlorophyll a+b,and carotenoids inwheat leaves treated with T3 was the highest, increasing by 63.95% ， 74.42% ， 67.44% ，and 51.35% respectively compared to T1 treatment.Thenet photosyntheticrate,transpirationrate,and stomatal conductance of leaves treated with T3 were the highest,with increasesof 38.16% ， 27.50% ，and 19.63% compared to T1 treatment. The activities of superoxide dismutase,catalase,and peroxidase in the leaves treated with T3 were the highest,increasing by 47.01% ， 55.15% ,and （204号 54.87% respectively compared to T1 treatment.It can be seen that exogenous proline can effctively alleviate the inhibitory efectsofdroughtstressonphotosynthetic pigments,netphotosyntheticrate,and protective enzymeactivity in wheat seedlings,withthebest effect observed ataproline concentrationof 30mmol/L

Keywordsproline; drought stress; wheat; photosynthetic pigments; photosynthetic haracteristics

干旱胁迫是植物生长过程中时常遇到的逆境因子之一。（剩余6186字）