UPTAKE OF DIFFERENT FORMS OF NITROGEN BY HYPHAE OF ARBUSCULAR MYCORRHIZAL FUNGI

A two-compartment incorporating air-gap device and()~(15)N_labeling technique was used to investigate the uptake of different forms of N by arbuscular mycorrhizal fungi(AMF).Maize(Zea mays L.) was in association with Glomus mosseae,or Glomus intraradices.Solutions labeled with different forms of()~(15)N were supplied to the hyphae compartment 48 h before harvesting.The result showed that the uptake capability of()~(15)N varied with fungi species and N forms supplied.Percentage of()~(15)N taken up over 48 h by G.intraradices was higher than that by G.mosseae.The uptake capability of()~(15)N by AMF was in the order of()~(15)NH~+_4()~(15)N-Gln()~(15)N-Gly()~(15)NO~-_3.()~(15)N uptake by AMF hyphae accounted for 0.004%～0.032% of total N uptake.