马铃薯对旱胁迫的反应

RESPONSE OF POTATOES TO DROUGHT STRESS

为探讨干旱胁迫对马铃薯生理机制的影响,以抗旱性不同的马铃薯品种台湾红皮、会-2和早大白为试材,研究干旱胁迫下马铃薯相关生理指标的变化。结果表明:随着胁迫时间的延长,质膜相对透性、丙二醛(MDA)含量、脯氨酸(Pro)含量增加,而抗坏血酸(AsA)含量降低,超氧化物岐化酶(SOD)和过氧化物酶(POD)活性先升高后降低。抗旱性强的品种质膜相对透性、MDA含量增加的幅度较小,Pro含量增加幅度较大,AsA含量降低的幅度较小,SOD和POD的活性也较高,而抗旱性弱的品种则相反,这些指标及其变化可以作为鉴定马铃薯抗旱能力的依据。

To find out effects of drought stress on physiological mechanism of potatoes,different drought-resistant varieties were utilized as the materials t o study changes of some physiological indexes under ar-tificial drought condition.The relative permeability of plasmalemma,malonald ehyde(MDA)content and proline(Pro)content always increased,and ascorbic acid(AsA )content kept descending,while superoxide(SOD)and peroxidase(POD)activities tend ed to descend a little after rising.In the high drought-resistant varieties,the relative permeability of plasmalemma,MDA content increased little,Pro content en hanced much,AsA content dropped little,SOD and POD activities sustained at the h igh level,while low drought-resistant variety was oppo-site.The physiological indexes and their changes can be used as basis to ide ntify the drought resistance of pota-toes.