摘要
研究了低温胁迫对大花五桠果(Dillenia turbinata)、双翼豆(Peltophorum tonkinense)、海南山竹子(Garcinia oblongifolia)、盆架子(Alstonia scholaris)、非洲桃花心木(Khaya senegalensis)和海南红豆(Ormosia pinnata)幼苗的影响。结果表明:低温胁迫下6种苗木叶片的相对电导率比对照有所增加;除了0℃处理的双翼豆幼苗外,低温胁迫的幼苗叶片内的脯氨酸含量大于对照;不同低温胁迫的幼苗叶片的蛋白质和叶绿素含量变幅较小;大花五桠果、海南山竹子、非洲桃花心木叶片的丙二醛(MDA)含量随着温度的降低而上升,而其他树种幼苗的丙二醛含量变化幅度不大;各低温胁迫的大花五桠果叶片的超氧物歧化酶(SOD)活性显著高于对照,双翼豆叶片的SOD活性低于对照,而其他幼苗叶片的SOD活性变化较小。采用主成分分析法进行抗寒综合评价表明,6种苗木的抗寒能力排序为海南红豆>盆架子>非洲桃花心木>海南山竹子>双翼豆>大花五桠果。
With the seedlings of Dillenia turbinata, Peltophorum tonkinense, Garcinia oblongifolia, Alstonia scholaris, Khaya senegalensis and Ormosia pinnata as tested materials, this paper studied the effects of low temperature stress on their physiological characteristics. The results showed that under low temperature stress, the relative electrical conductivity of the seedlings had a slight increase. Except for P. tonkinense at 0℃, the free proline content in tested tree species seedlings treated with low temperature was higher than the control, but the soluble protein and chlorophyll contents fluctuated slightly. The MDA content in D. turbinate, G. oblongifolia and K. senegalensis seedlings increased with decreasing temperature, while that in other tree species seedlings changed slightly. Under low temperature stress, D. turbinata seedlings had a significantly higher SOD activity, P. tonkinense seedlings were in adverse, and the seedlings of other tree species changed slightly. Principal component analysis indicated that the cold resistance of tested tree species was in the order of 0. pinnata 〉 A. scholaris 〉 K. senegalensis 〉 G. oblongifolia 〉 P. tonkinense 〉 D. turbinata.
出处
《生态学杂志》
CAS
CSCD
北大核心
2008年第4期524-531,共8页
Chinese Journal of Ecology
基金
广东省林业局资助项目(4400-F07041和4400-F07064)
关键词
低温胁迫
幼苗
抗寒指标
主成分分析
low temperature stress
seedling
cold resistance index
principal component analysis.
