植酸钠对菌根真菌根内菌丝碱性磷酸酶活性及根外菌丝生长的影响

采用三室隔网培养装置，以玉米为宿主植物，接种丛枝菌根真菌(AM)(Glomus intraradices)，研究了不同用量的植酸钠对AM真菌生长和代谢活性的影响．研究发现，接种AM真菌的植株地上部和根系的P浓度和吸P量，比非菌根植物的提高了1～2倍．外源植酸钠的存在，显著降低了AM真菌根内菌丝的碱性磷酸酶活性，增加了AM真菌在土壤中的菌丝密度．结果表明，外源植酸钠对根内AM真菌碱性磷酸酶活性和真菌根外菌丝的生长具有调控(增减)作用，并且AM真菌提高了植物对土壤固有养分和外源植酸钠中P的吸收和利用．

Effect of sodium phytate on alkaline phosphatase (ALP) activity in intraradical hyphae of AM fungi and development of its extraradical hyphae

In this paper, a pot experiment with three compartments was installed to study the effect of Na-phytate on the development and metabolic activity of AM fungi. Maize was selected as host plant and inoculated with arbuscular mycorrhizal fungus (Glomus intraradices), and different amounts of Na-phytate were applied into hyphal compartments. The results showed that the absorbed P in the shoots and roots of maize inoculated with AM fungi was 1-2 times higher than that of non-inoculated maize. The ALP activity in intraradical hyphae of AM fungi was significantly decreased, and the total hyphal density of AM fungi increased with applied Na-phytate. Observations suggested that the ALP activity in intraradical hyphae of AM fungi and the development of its extraradical hyphae could be regulated by Na-phytate. Additionally, AM fungi could enhance the plant's P absorption and utilization from native soil P and additive Na-phytate.