草业科学2012，Vol.29Issue(9)：1407-1416,10.
紫花苜蓿越夏期的生理生化反应及评价
Evaluation of physiological and biochemical response of alfalfa cultivars during summer
摘要
Abstract
High temperature induces a series of responses in physiology and morphology. In order to study this changes, 22 alfalfa （Medicago sativa） varieties were used to measure the contents of relative water content, soluble protein, relative electrical conductivity, and the activity of superoxide dismutase and peroxidase under different natural temperature in the summer. A randomized complete block design was conducted with three replicates. Using the method of cluster analysis, the heat resistance of these varieties were preliminarily evaluated. The results showed that, 1） the four indicators except the relative electrical conductivity, increased as the temperature progressed from 25 May to 21 June, and then dropped as the temperature dropped. However, the relative electrical conductivity increased by 3.36 times gradually; 2） in this study, 22 alfalfa varieties were divided into three types by hierarchical clustering, which are strong heat-resistance type, weak heat-resistance varieties and intermediate type, respectively. The varieties of heat-resistant type included Sitel, followed Derby, Phabulous, Empress 2000, 8925MF, Gold Empress and WL-414, while the intermediate heat-resistant varieties were Sardi 7, Alfasuper, Powerplant, WL- 525HQ, Algonquin, Hunter River, Alfking, AmeriGraze401 and Siriver. The other varieties were weak heat-resistant varieties; 3） there was very significant negatively correlation （P〈0.01） between FD class and relative water content. There were significant negatively correlations （P〈0.05） between FD class and soluble protein content, and FD class and POD activity. The relationships between FD class and the conductivity or FD class and SOD activity were not significant （P〉0.05）. The correlation coefficient were 0. 138 and -0. 405. There were significant correlations among different indicators （P〈0.01）.关键词
高温/秋眠/电导率/SOD/PODKey words
high temperature/fall dormancy/electrical conductivity/SOD/POD分类
农业科技引用本文复制引用
张晓霞,高永革,郑春雷,王成章,王彦华..紫花苜蓿越夏期的生理生化反应及评价[J].草业科学,2012,29(9):1407-1416,10.基金项目
基金项目：国家自然科学基金 （）
现代农业产业技术体系建设专项资金 （）
