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核农学报  2014 

镉处理下增施氮对杨树叶绿素合成和叶绿体超微结构的影响

DOI: 10.11869/j.issn.100-8551.2014.03.0485, PP. 485-491

Keywords: 杨树,,,叶绿素合成,超微结构,解毒作用

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Abstract:

为进一步验证氮在植物解除重金属毒害中的积极作用和生理机制,本试验对杨树幼苗在镉胁迫下增施氮肥后的生长、叶绿素合成前体物的变化和叶绿体超微结构进行研究。结果表明:单纯的Cd处理显著抑制杨树植株的生长,破坏叶绿体结构,阻止叶绿素的合成,其受阻位点可能位于UrogenⅢ到CoprogenⅢ之间;而在有效氮供应充足条件下,高浓度Cd处理的植株长势明显优于对照和单纯重金属处理的植株,而且叶绿素合成途径畅通,叶绿体结构完整。由此说明,氮在植物对重金属的解毒中起到重要作用,增施氮肥可缓解重金属对植物的毒害。

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