【摘要】 大豆幼苗叶片的相对含水量随着PEG处理浓度的增加而降低。同一处理浓度下(7％PEG渗透势培养液),不同抗旱类型大豆栽培品种具有的保水能力(或吸水能力)是不同的。用PEG作为干旱渗透剂时,随PEG浓度的增加,叶片质膜的相对透性逐渐增大,全株生物产量逐渐降低,植株的生长高度也下降。膜透性的增大或全株生物产量降低的幅度因品种类型而异,抗旱类型品种的生物产量波动不显著。在浓度为0—8％的PEG渗透势培养液中,质膜的相对透性与叶片相对含水量、干旱期间植株的生长高度呈负相关;敏感类型品种其质膜的相对透性与全株生物产量呈显著负相关,而抗旱类型品种呈不显著的负相关。更多还原

【Abstract】 Study was undertaken on the effect of drought on the relative permeability of plasma membrane, the relative water content of the leaves and the biological yield of plant of soybean seedlings. Soybean seedlings were treated with the culture solution containing PEG at different concentrations.The results showed that the relative water content of the leaves decreased gradually with the increase of PEG concertration. The ability of water absorption of the various drought-resistant types of soybean cultivars was different under same PEG concentration. with increasing PEG concertration, relative permeability of the plasma membrane of the leaves increased gradually; the biological yield of plant and plant hight during drought treatment were gradually reduced. The range of increase of relative permeability of plasma membrance and the decreas of biological yield of plant was different in various types of soybean cultivars.In the culture solution of PEG concentration by 0-8%, the relative permeability of plasma membrane was significantly and negatively correlated with the relative water content of the leaves and the plant hight during the drought treatment. The relative permeability of plasma membrane of the drought-sensitive cultivars was significantly and negetively correlated with the biological yield of the plant; but in the drought-resistence cultivars, the relation between the relative permeability of plasma membrane and the biological yield of the plant was not significantly and negatively correlated.更多还原