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OALib Journal期刊
ISSN: 2333-9721
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镉锌复合胁迫对秋茄幼苗渗透调节物质的影响
DOI: 10.3724/SP.J.1145.2009.00308, PP. 308-312
Keywords: 红树,秋茄,cd？zn复合,渗透调节物质
Abstract:
摘要通过土壤盆栽研究了不同浓度镉(cd，0、2.5、50mgkg-1)、锌(zn，0、100、500mgkg-1)胁迫下红树植物秋茄的幼苗体内可溶性蛋白、可溶性糖、脯氨酸、有机酸含量的变化.结果表明，cd、zn单一处理下，秋茄体内渗透调节物质含量随重金属浓度升高而增加；cd、zn复合处理对秋茄体内可溶性蛋白质含量的复合效应主要表现为协同作用：cd的加入减弱zn对秋茄体内可溶性糖含量的刺激作用，低cd浓度处理下zn的加入导致可溶性糖含量增加，而高cd浓度处理下zn的加入反而降低其含量.低浓度zn(或cd)的加入与土壤中cd(或zn)发生拮抗作用，秋茄体内脯氨酸、有机酸含量下降；高浓度zn(或cd)的加入与土壤中的cd(或zn)发生协同作用，导致渗透调节物质脯氨酸、有机酸的积累量增加，从而缓解高浓度重金属的胁迫.植物组织或部位不同，cd与zn浓度和比例不同，cd、zn之间的复合作用存在一定的差异.表5参30
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