六十九个苜蓿品种耐盐性及其二个耐盐生理指标的研究

STUDIES ON THE SALT TOLERANCE OF SIXTY-NINE ALFALFA CULTIVARS AND TWO PHYSIOLOGICAL INDICATORS CONCERNING THE TOLERANCE

通过苗期盆栽胁迫试验,对69个苜蓿品种的耐盐性进行了研究。经对0.3%和0.4%盐处理的存活率、相对株高和相对干重共6个指标的聚类分析,将供试69个品种的耐盐性分为三级,其中耐盐品种21个,中等耐盐品种40个,敏感品种8个。选择耐盐性差异较大的,包括5个耐盐品种和5个敏感品种,研究叶片细胞膜透性以及叶片游离脯氨酸含量与苜蓿品种耐盐性的关系。结果表明耐盐性不同的10个苜蓿品种之间,在叶片细胞膜透性和叶片游离脯氨酸累积量上无明显差异,这二个生理指标不能作为评价苜蓿品种间耐盐性差异的指标。

The salt tolerance of sixty—nine alfalfa cultivars has been studied through the sodium chloride stress test in the seedling stage.The comprehensive appraisal of the salt tolerance of these cultivars was made by the cluster analysis of six variables,i.e.the survival rate,the relative plant height and the relative biomass dry weight of the 0. 3% and 0. 4%(NaCl/soil dry weight)treatments,respectively.The results indicated that the salt tolerance of these sixty—nine cultivars could be divided into three groupes,among them, twenty one are salt tolerant,fourty one are medium salt tolerant,the other eight are salt sensitive.The cell membrance permeability and the free proline accumulation of ten cultivars with different salt tolerance have been studied during the stress.It is revealed that there exists no significant difference between the salt tolerant and the sensitive cultivars in the cell membrance permeability and the free proline accumulation. These two physiological indicators could not be used for evaluating the salt tolerance of the alfalfa cultivars.