植物磷营养状况对丛枝菌根真菌生长及代谢活性的调控REGULATION OF P STATUS IN HOST PLANT ON ALKALINE PHOSPHATASE (ALP) ACTIVITY IN INTRARADICAL HYPHAE AND DEVELOPMENT OF EXTRARADICAL HYPHAE OF AM FUNGI
冯海艳,冯固,王敬国,李晓林
摘要(Abstract)：
采用四室隔网培养装置,以玉米为宿主植物,通过在植物生长室设0、50、250和500 mgPkg-1 4个施磷水平,研究了植株体内的磷营养状况对AM真菌Glomus sinuosum和Glomus intraradices生长及活性的影响。研究发现在不施磷条件下,接种AM真菌G. intraradices显著促进了植物生长和磷的吸收;低磷条件(50 mgPkg-1)下,接种菌根真菌显著促进了植物对磷的吸收,但对植物生长没有明显的影响;而在高磷条件(250 mgPkg-1 和500 mgPkg-1)下,接种菌根真菌不但没有促进植物的生长和磷的吸收,反而对其有抑制作用。随着施磷水平的提高, AM真菌根内菌丝的碱性磷酸酶活性显著下降;与不施磷相比,低量(50 mgPkg-1)供磷增加了AM真菌土壤中根外菌丝的密度,高磷(250 mgPkg-1 和500 mgPkg-1)降低了土壤中根外菌丝的密度。上述结果说明:⑴ 给宿主植物施用磷肥引起的植物磷营养状况的改变,对AM真菌生长和代谢活性具有一定的调控作用;⑵ G. sinuosum和G. intraradices两种AM真菌的生长和代谢活性对施磷水平的响应程度无显著性差异;⑶ 高磷抑制AM真菌生长和代谢活性,使真菌吸磷量减少,可能是造成菌根效应降低的原因之一
关键词(KeyWords)： 施磷水平;弯丝球囊霉;根内球囊霉;玉米
基金项目(Foundation): 中国-欧洲联盟合作项目(MYCHINTEC-ICA4-CT-2000-30014)
作者(Author): 冯海艳,冯固,王敬国,李晓林
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