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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。
The relative water content of soybean seedling leaves decreased with the increase of PEG concentration. Under the same treatment concentration (7% PEG osmotic medium), different drought-tolerant soybean cultivars have different water retention capacity (or water absorption capacity). With PEG as a drought osmolyte, with the increase of PEG concentration, the relative permeability of plasma membrane gradually increased, the whole plant biomass decreased and the plant height also decreased. The increase of membrane permeability or the decrease of whole plant biomass yield varied with different types of cultivars. The biological yield of drought-resistant cultivars was not significantly fluctuated. The relative permeability of the plasma membrane was negatively correlated with the relative water content of leaves and the height of the plants during the drought period in PEG osmotics medium with concentration of 0-8%. The relative permeability of the plasma membrane of the susceptible varieties with the whole plant There was a significant negative correlation between biomass and biomass, while there was no significant negative correlation between types of drought-tolerant cultivars.