种子2025，Vol.44Issue(1)：79-88,10.DOI:10.16590/j.cnki.1001-4705.2025.01.079
水稻种质苗期耐旱性评价及相关酶活性研究
Evaluation of Drought Tolerance and Correlation of Enzyme Activity in Rice Germplasm at Seedling Stage
摘要
Abstract
In order to investigate rice(Oryza sativa L.)seedling tolerance and related enzyme activi-ties,8 morphological traits including plant height,plant total length,root length,stem and leaf fresh weight,root fresh weight,root number,stem and leaf dry weight and root dry weight were measured and analyzed in 31 rice germplasm materials under drought stress and conventional treatment.At the same time,the activities of antioxidant enzymes SOD,POD,CAT and MDA were measured respec-tively,and the correlation between them and drought tolerance level was analyzed.The results showed that 5 rice germplasm materials(Wanhui45,303B,Zhenghan No.10,Wanhui56,H6)were selected for strong drought tolerance,11 varieties for medium drought tolerance,13 varieties for weak drought tolerance and 2 varieties for drought sensitivity.Compared with 31 rice germplasms treated with drought stress and conventional treatment,SOD activity increased in 26 rice germplasms and decreased in 5 rice germplasms.POD activity increased in 22 germplasms,and 9 germplasms de-creased;CAT activity increased in 28 germplasms and decreased in 3.MDA values showed the oppo-site trend,increasing in 7 germplasms and decreasing in 24 germplasms.Through the correlation analysis of drought tolerance level and the relative value of each enzyme activity,it was found that drought tolerance level was positively correlated with POD activity and negatively correlated with MDA value.关键词
水稻/耐旱/形态指标/酶活性Key words
Oryza sativa L./drought-tolerant/morphological index/enzyme activity分类
农业科技引用本文复制引用
蒋京桂,黄世炎,黄成志,刘军化,雷树凡,吕直文,刘忠贤,刘鹏,蔡钟亚..水稻种质苗期耐旱性评价及相关酶活性研究[J].种子,2025,44(1):79-88,10.基金项目
国家现代农业产业技术体系建设专项项目(CARS-01-77) （CARS-01-77）
重庆市现代农业产业技术体系(CQMAITS202301) （CQMAITS202301）
重庆三峡农业科学院自立科技项目(Sxnky2023003) （Sxnky2023003）
