大豆对干旱胁迫的抗性效应

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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。 From 1984 to 1986, the water potential of potted plants, the conductivity of extracellular electrolyte of leaf mesophyll and the activity of peroxidase of leaves were measured under the condition of simulating dry land under different growth stages of soybean and compared with the measured yield And its yield factor results compared to the results were analyzed. The results showed that there were differences among cultivars in the degree of damage under drought conditions. For the same species, the resistance to drought also had differences during the growth period. In general, the water potential of soybean plants decreased sharply in dry land, but the amplitude of decline was not uniform. The relative permeability of extravasable medium increased due to the damage of plasma membrane and the increase of permeability. The results of regression analysis showed that the relative content of extracellular electrolyte in mesophyll cells under drought stress was significantly negatively correlated with the plant water potential, while the peroxidase activity was positively correlated with the relative content of extracellular electrolyte. As a direct indicator of drought resistance, the yield traits were compared with the changes of the relative content of extravasated media. It can be seen that under drought conditions, the greater the relative permeability of the plasma membrane, the more sensitive the varieties to drought. The peroxide The higher enzyme activity.
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