西北林学院学报2025，Vol.40Issue(1)：42-50,9.DOI:10.3969/j.issn.1001-7461.2025.01.05
干旱胁迫对沙蒿叶片水分含量、光合特性及抗氧化酶的影响
Effects of Drought Stress on Water Content,Photosynthetic Characteristics and Antioxidant Enzymes of Artemisia desertorum leaves
摘要
Abstract
Two-year-old Artemisia desertorum seedlings were used as materials to determine the water,photosynthetic characteristics and antioxidant enzyme activity characteristics of the leaves under different water conditions by potted plan water control experiment.The variation characteristics,response mecha-nism and quantitative relationship with soil moisture of each index during drought stress were analyzed,so as to reveal the response law of A.desertorum to drought stress.The results showed that 1)relative water content(RWC)of A.desertorum leaves continued to decrease with the increase of drought stress days,rel-ative water deficit(RWD)showed a fluctuating upward trend.2)The contents of total chlorophyll(Chl),Chla and Chlb all decreased with the increase of stress days,and decreased to the minimum at 30 days,while the content of carotenoid increased gradually with stress days.3)The main gas exchange parameters such as net photosynthetic rate(Pn),transpiration rate(Tr)and water use efficiency(WUE)showed ob-vious threshold response to soil moisture,and the threshold value of soil moisture was 6.48%-17.51%,which was suitable for normal photosynthetic physiological activities.4)Fv/Fm、Fv'/Fm'and qP decreased with stress days and light intensity,while NPQ increased slowly.5)The content of MDA increased with stress days,and the content of SOD increased with stress days,and the maximum was at 30 d.POD could respond to drought stress early,the CAT activity was inhibited by persistent drought stress,and the sensi-tivity of CAT to drought stress was poor.At the late stage of stress,under drought stress conditions,A.desertorum can adapt to arid environments by improving the light energy capture and conversion ability of leaves and enhancing the antioxidant capacity.关键词
沙蒿/干旱胁迫/叶片水分含量/光合特性/抗氧化酶活性Key words
Artemisia desertorum/drought stress/leaf water content/photosynthetic characteristics/antioxi-dant enzyme activity分类
农业科技引用本文复制引用
柴成武,王方琳,赵鹏,付贵全,唐卫东..干旱胁迫对沙蒿叶片水分含量、光合特性及抗氧化酶的影响[J].西北林学院学报,2025,40(1):42-50,9.基金项目
国家自然科学基金项目:河西走廊荒漠绿洲过渡带盐碱地生态修复与功能提升(U23A2061). （U23A2061）
