【摘要】 同类根型的苎麻基因型抗旱性存在显著差异。在干旱胁迫下，抗旱性强的基因型叶片相对含水量、水势和细胞膜的稳定性高，苎麻叶片游离脯氨酸积累和过氧化物酶活性对干旱胁迫的反应存在基因型差异，随着干旱胁迫加强，抗旱性强的基因型过氧化物酶活性从低到高，而抗旱性弱的基因型则相反。在干旱胁迫0－12天内，抗旱性弱的基因型积累游离脯氨酸多于抗旱性强的基因型，而随着胁迫加强（干旱12－24天），抗旱性强基因型游离脯氨酸积累强度大于抗旱性弱的基因型，这可能是苎麻通过积累游离脯氨酸来抵抗逆境的一种积极反应模式。更多还原

【Abstract】 There were highly significant differences in drought resistance in dexes of ramie genotypes having same root-types. Relative water content (RWC),water potential and cell membrane stability were high for drought resistant ramie genotypes under drought stress. With the increase of stress, Peroxidase activity in drought - resistant genotypes trended from high to low, but that in drought-sensitive ones changed contrily, The proline levels in drought - sensitive genotypes showed higher than that in drought - resistant ones under lighter drought stress (0 - 12 days o drought stress ).The proline accumulation in drought - resistant genotypes showed a faster rate as compared with that in drought sensitive ones under more serious drought stress (12 - 24days of drought stress ). This is probably a postive responese pattern by free - proline accumulation for ramie to stresses.更多还原