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环境化学  2015 

丛枝菌根真菌(AMF)对铯胁迫宿根高粱生长及根际土壤酶的影响

Keywords: 丛枝菌根真菌,铯胁迫,宿根高粱,根际土壤酶

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Abstract:

通过盆栽试验研究了接种透光球囊霉(Glomusdiaphanum)、摩西球囊霉(Glomusmosseae)、地表球囊霉(Glomusversiforme)及幼套球囊霉(Glomusetunicatum)等4种丛枝菌根真菌(AMF)对铯污染下宿根高粱生长及根际土壤酶活性的影响.结果表明,与未接种对照相比,接种AMF处理均显著增加了宿根高粱的株高和根长,同时增强了过氧化氢酶、蔗糖酶活性及根系活力(P<0.05),且以接种G.etunicatum增强效果最好,上述酶活性和根系活力分别相当于对照的1.11、2.25和4.04倍,而接种Glomusdiaphanum最显著增强了酸性磷酸酶活性,使其提高了24.53mg·g-1·d-1·FW(P<0.05),宿根高粱对铯的耐性指数均高于对照,说明AMF在一定程度上能缓解铯污染胁迫对根际土壤酶的抑制作用,进而减轻核素铯对植物的毒害;接种AMF处理显著抑制了脲酶活性,表明脲酶可作为反应土壤核素铯污染的一个有效指标.同时也表明AMF有效地增强了宿根高粱对核素铯的耐性能力.

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