以2个豇豆品种S3(铝敏感)、T6(耐铝)为材料,研究不同铝浓度处理对豇豆幼苗根系伸长和根系生理特性的影响.结果表明,随着铝浓度的增加,2个豇豆品种根系伸长均受到抑制,其中对S3的抑制程度大于T6.随着铝浓度的升高,2个豇豆品种的丙二醛(MDA)含量都显著增加(P＜0.05),且S3的增加幅度大于T6.2个豇豆品种超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性均随着铝浓度的增加而有所上升,其中S3的SOD活性上升幅度比T6高,S3的POD、CAT活性上升幅度比T6低.铝处理后2个豇豆品种根系均分泌苹果酸和柠檬酸,其中T6根系苹果酸的分泌量高于S3.%The cowpea cultivar T6 (Aluminum-tolerant) and S3 (Aluminum-sensitive) were selected as materials to study the effects of different concentrations of aluminum on the root growth and physiological characters of cowpea seedlings. The results showed that the root lengths of T6 and S3 were inhibited with the increase of aluminum (Al) concentration , and the inhibition to S3 was greater than that to T6. The MDA contents in T6 and S3 roots were significantly increased with the increase of Al concentrations, and S3 was increased more than T6. The activities of SOD, POD and CAT in T6 and S3 roots rose with the rising of aluminum concentrations, the SOD activity in S3 root being increased more than that in T6 root and the activities of POD and CAT in T6 root being increased more than that in S3 root. After exposure to Al, both malic aid and citric acid were secreted from T6 and S3 roots, and the malic acid content secreted from T6 root was higher than that from S3 root.
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