采用乙二醇 (PEG6 0 0 0 )渗透胁迫的方法 ,研究了两个不同抗旱性小麦品种对渗透胁迫的反应。结果表明 ,在渗透胁迫下 ,随水势的降低 ,小麦种子萌发生长减弱 ,表现为发芽率降低 ;芽长、根长和根数减少 ;根系活力和活跃的根比表面积下降 ;细胞膜伤害程度和叶片脯氨酸含量增加。抗旱性不同的品种相比 ,抗旱性强的品种受渗透胁迫影响较小 ,而抗旱性弱的相对较大。 Using osmotic stress of ethylene glycol (PEG6000), the responses of two wheat cultivars with different drought tolerance to osmotic stress were studied. The results showed that under osmotic stress, the germination and growth of wheat decreased with the decrease of water potential, the germination rate decreased, the length of bud, root length and root number decreased, the root activity and active root specific surface area decreased, Proline content increased. Compared with drought-resistant varieties, drought-tolerant cultivars were less affected by osmotic stress and drought-resistant ones were relatively weaker.