【摘要】 1984至1986年,在大豆不同生育时期人工摸拟旱境的条件下,测定了盆栽植株的水势,叶肉细胞外渗电介质的电导率和叶片的过氧化物酶活性,并与其所测得的产量及其产量因子结果相比较地进行了分析。结果表明,在干旱条件下受害程度存在着品种间差异,就对同一品种而言,对干旱的抗性效应也存在着生育时期间的差异。总的来说,大豆植株在旱境中水势大幅度下降,但下降的幅度不尽一致;由于其细胞质膜受损,透性增大,从而外渗电介质相对含量增大。回归相关测定结果表明,干旱条件下的叶肉细胞外渗电介质的相对含量,与其植株水势呈显著负相关,而过氧化物酶活性与其外渗电介质的相对含量呈显著正相关。做为抗旱的直观指标——产量性状与其外渗电介质相对含量的变化相比较地分析,可以看出,在干旱条件下细胞质膜相对透性越大,品种对干旱表现越敏感,其过氧化物酶活性越高。更多还原

【Abstract】 The experiments were conducted under the artificial drought conditions at the growth-development stages during 1984-1986.The results indicated that there were varietal differences on degree of drought injury, and drought resistance between different stage of growth and development was also different on the same variety. In generaly, there was remarkable decrease in plant water potential under the water dificit condition, and the relative content of the osmotic electrolyte from cells of leaf blade increased as a result of plasmalem-ma injury and its permeability enhanced.Regression analysis showed that there were significant negative correlation between content of the osmotic electrolyte and water potential, and significant positive correlation between content of the osmotic electrolyte and the peroxidase activity of the leaf under water dificit condition.Byaaalysing the relative variation of the yield components of soybean incontrast with its relative content of the osmotic electrolyte under the water stress revealed that the more variation the plasmlemma permeability were caused, the more sensitive to drought stress the variety was, and the higher the peroxidase activity was.更多还原