干旱胁迫下苎麻的生理生化变化与抗旱性的关系

 在干旱胁迫下 ,抗旱性强的品种叶片相对含水量、细胞膜的稳定性高 ,随着干旱胁迫加强 ,抗旱性强的品种过氧化物酶活性提高 ,复水后下降快 ;而抗旱性弱的品种在一定限度胁迫下过氧化物酶活性增加 ,严重胁迫下则大幅度下降 ,然后复水后呈缓慢下降趋势 ;在干旱胁迫较轻时 ,抗旱性弱的品种积累游离脯氨酸多于抗旱性强的品种 ,而随着胁迫加强 ,抗旱性强品种游离脯氨酸积累强度大于抗旱性弱的品种 ;复水后抗旱性强的品种游离脯氨酸下降快 ,而抗旱性弱的品种则下降缓。干旱胁迫下苎麻叶片丙二醛 (MDA)含量增加 ,随着胁迫加强 ,抗旱性弱的品种增加的速度快 ,抗旱性强的品种增加的速度慢

Relationship Between Physiological-biochemical Chan ges of Ramie Under Drought Stress and Drought Resistance

A study on the physiological biochemical changes of different ramie varieties under drought stress was carried out,the results showed that relative water content (RWC) decreased and RPP increased with the increase of drought stress. Campared with drought sensitive varieties, drought resistant varieties had higher RWC in leaf but lower RPP;Peroxidase activity of drought resistance varieties changed from low to high whereas that of drought sensitive ones changed in opposite direction; Proline content of drought sensitve arieties was higher than that of drought resistant ones under a certain degree drought stress. Proline accumulation in drought resistant varieties was faster as compared under that in drought sensitive ones under serious drought stress. MDA content in leaf was increased under drought stress. MDA content increased slowing in resistant varieties while that increased rapidly in sensitive ones.