水淹胁迫对华南地区3种园林树种生理特征的影响

Effects of Submergence Stress on Physiological Characteristics of Three Garden Tree Species in South China

为了了解红荷、红苞木、樟树幼苗的抗涝能力,为筛选优良的抗涝树种提供依据,通过人工模拟水淹胁迫环境,测定这3种幼苗叶片的叶绿素等生理指标,用主成分分析法研究了这3种幼苗的抗涝性。研究结果表明:随着水淹胁迫时间的延长,红荷幼苗叶片叶绿素含量波动,红苞木和樟树小幅上升后下降;3种幼苗叶片的可溶性糖含量呈波动性上升的趋势;红苞木和樟树的蛋白质含量呈现波动性变化,红荷的蛋白质含量为降-升-降;红荷的叶片的超氧化物歧化酶(SOD)活性呈逐渐下降趋势,红苞木和樟树的SOD活性显著上升后下降;红荷、红苞木和樟树幼苗叶片的丙二醛(MDA)含量大幅增加后缓缓下降。3种幼苗在水淹28天期间内均有一定的抗涝性,采用主成分分析法得出幼苗的抗涝性大小为樟树>红荷>红苞木。

In order to study submergence-resistant ability of seedlings of Schima wallichii, Rhodoleia championii and Cinnamomum camphora and provide reference for selection of submergence-resistant tree species, contents of chlorophyll and other physiological indices were determined under submerged stress environment and then principal component analysis was used. The results showed that with increasing submergence time, the chlorophyll content of S. wallichii seedlings fluctuated, that of R. championii and C. camphora slightly increased followed by a decrease; the content of soluble sugar of the three seedlings tended to increase; the content of soluble protein of S. wallichii and C. camphora changed fluctuantly, whereas that of R. championii decreased followed by a increase and then decreased; the activity of SOD of S. wallichii tended to decrease gradually, whereas that of R. championii and C. camphora significantly increased and then decreased; the content of MDA of the three seedlings significantly increased and then gradually decreased. The three seedlings showed a certain submergence-resistant ability during the submergence period of 28 days, and principal component analysis indicated that the order of submerging resistance was C. camphoraS. wallichii R. championii.