研究了淹涝胁迫对不同种源鹅掌楸〔Liriodendron chinense(Hem sl.)Sarg.〕和杂种鹅掌楸(L. chinense×L. tulipifera)幼苗部分生理指标的影响。结果表明:在淹水处理24 h后,杂种鹅掌楸幼苗叶片的净光合速率变化不明显,鹅掌楸幼苗叶片的净光合速率则有一定程度的下降;在淹水处理48 h后,净光合速率均大幅度下降。在淹涝胁迫下及胁迫解除后,幼苗叶片叶绿素含量持续缓慢下降;而脯氨酸含量总体上呈现上升的趋势;与鹅掌楸相比,杂种鹅掌楸幼苗的超氧化物歧化酶(SOD)和过氧化物酶(POD)活性变化不明显,但SOD活性最高,POD活性最低。结果表明,杂种鹅掌楸具有较强的耐淹涝胁迫的能力。 

The effect of waterlogging stress on physiological indexes of Liriodendron chinense(Hemsl.) Sarg. and L. chinense×L. tulipifera seedlings were studied. The net photosynthetic rate of L.chinense×L.tulipifera seedlings had no obvious change, while that of L. chinense seedlings decreased to certain degree after waterlogging stress for 24h. Then the net photosynthetic rate of all seedlings sharply decreased after 48h. During the period of waterlogging stress and after the stress, the chlorophyll contents decreased gradually, but the proline content increased gradually. After the waterlogging stress, the SOD and POD activities of L.chinense×L.tulipifera seedlings had no obvious changement, the SOD activity was the highest and the POD activity the lowest in comparing with L. chinense. The results indicated that waterlogging resistance of L.chinense ×L.tulipifera seedlings was higher than that of L. chinense seedlings.