不同水平腐胺对巴西蕉幼苗抗旱生理的影响

摘要

Foliar spraying of Brazil banana plantlets with 0.00, 1.00, 1.25, 1.50 and 1.75 ramol/L putrescine and then treated under drought stress, some relative physiological and biochemical indices were measured to study the changes. The results showed that the pretreatment with suitable concentrations of exogenous putrescine increased the relative water content of the Brazil banana plantlet leaves, reduced the relative conductivity, improved the contents of proline and soluble proteins, as well as the activity of SOD and POD, decreased the rate of O2-production and the content of MDA. The results proved that the suitable concentrations of exogenous putrescine could improve the drought resistance of Brazil banana plantlets. The optimal putrescine concentration was found to be 1.25 mmol/L.%用0.00、1.00、1.25、1.50、1.75 mmol/L腐胺(Put)喷施巴西蕉幼苗叶片,研究干旱胁迫后其相关生理生化指标的变化.结果表明,在干旱胁迫下,适宜浓度的外源Put预处理能显著增加巴西蕉幼苗叶片的相对含水量,降低相对电导率,提高脯氨酸、可溶性蛋白质的含量及S0D、POD的活性,.降低O2产生的速率,减少MDA的积累.由此说明适宜浓度的外源Put预处理能提高巴西蕉幼苗抗旱性,以1.25 mmol/L Put预处理效应最佳.