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草地学报  2015 

外源NO对高羊茅镉伤害缓解效应研究

DOI: 10.11733/j.issn.1007-0435.2015.02.018, PP. 338-345

Keywords: 一氧化氮,高羊茅,镉伤害,植物修复

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Abstract:

为了探讨外源一氧化氮(NO)对镉(Cd)胁迫下高羊茅(Festucaarundinacea)生理响应的调节机制,采用水培方法,研究了不同浓度的NO供体硝普钠(SNP)对100μmol·L-1CdCl2胁迫下高羊茅幼苗生长、光合特性及矿质元素吸收的影响.结果表明在Cd胁迫下,外施SNP能显著增加高羊茅叶片中NO含量,同时增加植株干重,提高根生长率和根系活力;增加叶片中叶绿素和类胡萝卜素的含量,提高净光合速率(Pn)、增强PSII反应中心最大光能转换效率(Fv/Fm)等指标,显著增强了高羊茅地上部分与根对Ca,Mg,Zn和Fe的吸收,抑制了Cd向地上部分的转运.综合各项指标来看,100μmol·L-1SNP效果最好,能够显著改善高羊茅叶片的光合活性,维持植株体内矿质元素平衡,从而缓解Cd胁迫对高羊茅光合作用的抑制,促进其生长并提高其耐受性.

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