亚麻耐渍的生理机制研究初探

Primary Research on the Physiological Mechanisms of Flax in Waterlogging Stress

通过研究渍涝胁迫下,不同耐渍型亚麻品种的株高、工艺长度、出麻率等农艺性状以及植株丙二醛(MDA)含量、过氧化物酶(POD)活性的变化,初步揭示了亚麻耐渍的生理机制。试验结果表明:1、渍涝影响亚麻的农艺性状,具体表现在株高降低、工艺长度减短、出麻率下降等方面;渍涝胁迫下根部皮层通气组织的发育是衡量亚麻耐渍强弱的重要特性;2、随着渍涝胁迫时间的增加,不同耐渍型品种植株丙二醛(MDA)含量均有不同程度的增加,且非耐渍型品种的增加幅度大于耐渍型品种,说明渍涝胁迫下,耐渍型品种具有很强的抗膜脂过氧化的能力;3、随着渍涝胁迫时间的增加,不同耐渍型品种过氧化物酶(POD)活性都呈先升高后下降的趋势,耐渍型品种的变化大于非耐渍型品种,说明在渍涝胁迫下耐渍型品种体内过氧化物酶清除活性氧的能力高于非耐渍型品种。

According to the study on the agronomic characteristics such as plant height, technical length, fiber percentage, the content of MDA and activity of POD between different varieties of flax in waterlogging stress, the physiological mechanisms of resistance to waterlogging of flax was opened out primarily. The results indicated that： 1.Waterlogging stressing has effects on economic characters of flax. The plant height, technical length, fiber percentage of flax are decreased. Aerenehyma in root is an important characteristic for measuring the tolerance of waterlogging; 2.With the increasing time of stressing of waterlogging, the content of MDA increased, and the variation of the intolerant variety is more remarkable, so it shows that the tolerant variety has highly efficiency on resisting overoxidation of epicyte; 3. With the increasing time of stressing of waterlogging, the activity of POD increased at first, and decreased as followed. The variation of the tolerant variety is more obvious. It shows that the tolerant variety is more efficient in eliminating active oxygen.