摘要
通过模拟季节性淹水发生的情况,以枫杨、落羽杉和枫香为试验材料,研究这3个树种在淹水胁迫下的适应性和生理调节机制。结果表明:(1)枫杨等3个树种可耐长期水淹,对淹水胁迫具有很强的适应性。(2)不同淹水深度胁迫下,枫杨SOD、POD、CAT活性无显著差异,MDA含量随淹水深度增加呈现出递减趋势。枫香随淹水深度增加,SOD、POD活性逐渐减少,且渍水与深度淹水间存在显著差异(P <0.05);CAT活性随淹水深度增加而逐渐增加,但不同淹水深度间无显著差异。落羽杉在渍水时SOD活性显著高于轻度淹水,深度淹水时CAT活性极显著(P <0.01)高于渍水和轻度淹水时;MDA含量随淹水深度增加呈现出逐渐增加趋势,但无显著差异。(3)随淹水时间的延长,3个树种的SOD、POD、CAT保护酶活性多呈现出降低-升高-降低的波状起伏变化;枫杨、枫香的MDA含量呈现出先升高后降低的趋势,落羽杉的MDA含量变化不明显。(4)淹水胁迫解除后,枫杨等3个树种的SOD、POD、CAT酶活性及MDA含量普遍呈现先升高后降低的趋势。
By simulating the seasonal flooding happened, the research, aimed to understand in different waterlogging stress tolerance and adaptation mechanisms of three tree species(i.e. Pterocarya stenoptera, Taxodium distichum, Liquidambar formosana), was conducted. The results show that:(1)The three tree species all showed perfect ability tolerant to flooding for a long time.(2)Under different depth stress, the SOD, POD, CAT activity of Pterocarya stenoptera had no significant difference, and the MDA content showed a decreasing with flooding depth increase. For Liquidambar formosana, the SOD and POD activity gradually reduced with flooding depth increase, and had significant difference(P < 0.05) between waterlogging and flooding deeper. The CAT activity increased with flooding depth increase, but has no significant difference between different depth. For Taxodium distichum, the SOD activity was significantly higher in waterlogging than mild flooded, and the CAT activity was significantly(P < 0.01) in flooding deeper than waterloggingand mild flooded. The MDA content was increased with flooding depth increase, but there was no significant difference between different depth.(3)With increasing inundation duration,the SOD, POD, CAT activity of three tree species showed wave-like carves: down-up-down, and the MDA content of Pterocarya stenoptera and Liquidambar formosana exhibited increase first and then decrease.(4)After waterlogging stress relieved, the SOD, POD, CAT activity and MDA content of three tree species generally increased first and then decreased.
引文
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