接种丛枝菌根真菌(Glomus mosseae)对旱稻吸收砷及土壤砷形态变化的影响

采用接种和不接种菌根真菌(Glomus mosseae)两种模式,研究了菌根真菌对旱稻中砷积累的影响。结果表明接种菌根真菌能够明显提高旱稻地上部磷的含量(对照0.84g·kg-1,接种2.23g·kg-1)和地下部(对照0.76g·kg-1,接种1.04g·kg-1)对磷的吸收;降低地上部(对照2.40mg·kg-1,接种0.69mg·kg-1)和地下部(对照8.90mg·kg-1,接种4.87mg·kg-1)中砷的积累;提高磷从地下部向地上部的转运能力,从而有效抑制了砷从地下部到地上部的传输。进一步研究发现,菌根真菌还可以降低土壤溶液中AsIII和总砷含量,即菌根真菌能够降低水稻可获得的砷含量,从而减少砷对人体健康的威胁。

Effect of Inoculation of Arbuscular Mycorrhizal Fungi (Glomus mosseae) on As Uptake of Upland Rice and Transformation of As Speciation in Soil

The accumulation of arsenic in rice was investigated by inoculation or non-inoculation of arbuscular mycorrhizal fungi (Glomus mosseae).Inoculation of G.mosseae significantly increased the absorption of phosphate in rice shoot (control 0.84 g·kg-1,inoculation 2.23 g·kg-1) and root (control 0.76 g·kg-1,inoculation 1.04 g·kg-1),while decreased the accumulation of arsenic in corresponding rice shoot (control 2.04 mg·kg-1,inoculation 0.69 mg·kg-1) and root (control 8.90 mg·kg-1,inoculation 4.87 mg·kg-1).In the meantime,inoculation enhanced the migration of phosphate from root to shoot so that the migration of arsenic was effectively inhibited from root to shoot of rice.Further investigation showed that inoculation of G.mosseae decreased the concentrations of total arsenic and arsenite in soil solution,i.e.the amount of bioavailable arsenic in the soil decreased.Therefore,the inoculation of G.mosseae can reduce the health risk of arsenic from rice to the population.