湖南农业大学学报（自然科学版）2024，Vol.50Issue(3)：47-54,8.DOI:10.13331/j.cnki.jhau.2024.03.007
外源水杨酸对淹水胁迫下西瓜幼苗光合特性及抗氧化酶系统的影响
Exogenous salicylic acid affects photosynthetic properties and antioxidant protective enzyme system of watermelon seedlings under waterlogging stress
摘要
Abstract
To investigate the regulatory effect of salicylic acid(SA)on the growth of watermelon seedlings under flooding stress,the'Xuelong 1'watermelon variety was used as material.Six concentrations(0.0,0.5,1.0,1.5,2.5,3.5 mmol/L)of SA solution were sprayed,and the growth of watermelon seedlings,root system configuration,photosynthetic parameters,chlorophyll content,SPII light energy conversion efficiency,antioxidant enzyme activity and other indicators under flooding stress were measured and then were subjected to the principal component analysist analyze the effects of SA treatment on the physiological characteristics of watermelon seedlings under flooding stress.The results showed that different concentrations of SA alleviated the adverse effects of flooding stress on watermelon seedlings,and increased the activities of chlorophyll content,carotenoid content,actual photochemical efficiency of PSⅡ,superoxide dismutase(SOD),catalase(CAT),peroxidase(POD),and decreased the MDA content,of watermelon seedlings under flooding stress.It could be concluded that exogenous SA could improve the flooding tolerance of watermelon seedlings.Compared with 0.0 mmol/L SA treatment,under 1.0 mmol/L SA treatment the plant height,stem thickness,fresh mass and dry mass of watermelon seedlings were significantly increased by 18.80%,34.74%,23.57%and 67.27%,respectively;the total root length and the number of root tips were significantly increased by 116.41%and 101.25%,respectively;and the content of chlorophyll a,chlorophyll a+chlorophyll b and carotenoids were increased by 66.55%,67.46%and 73.81%,respectively;CAT activity increased significantly by 20.92%and MDA content decreased significantly by 53.32%.The results of principal component analysis showed that waterlogging tolerance of watermelons treated with 1.0,1.5,2.5,0.5,3.5 and 0.0 mmol/L SA decreased successively.关键词
西瓜/外源水杨酸/淹水胁迫/根系构型/光合特性/抗氧化系统Key words
watermelon/exogenous salicylic acid/flooding stress/root conformation/photosynthetic properties/antioxidant system分类
农业科技引用本文复制引用
江鸿,卿东山,陈浩杰,张露瑶,孙龙俊,戴思慧,孙小武..外源水杨酸对淹水胁迫下西瓜幼苗光合特性及抗氧化酶系统的影响[J].湖南农业大学学报（自然科学版）,2024,50(3):47-54,8.基金项目
国家重点研发计划资助项目(2020YFD1000300) （2020YFD1000300）
农业部岗位体系专家(CARS-25) （CARS-25）
湖南省重点领域研发计划项目(2022NK2007) （2022NK2007）
