Effects of two Glomus mosseae isolates on cotton salinity tolerance
不同生态型摩西球囊霉菌株对棉花耐盐性的影响

The effects of two \%Glomus mosseae\% isolates collected from non\|saline soil(M1) and saline soil(M2) on cotton growth at four NaCl levels (0,1,2,and 3g/kg) were investigated under greenhouse conditions.The results showed that mycorrhizal colonization of two isolates was 20% to 40%,and the colonization of M2 was higher than that of M1.The two isolates had different effects on growth and mineral elements uptake of cotton plant.Isolate M1 increased biomass and phosphorus concentration,but had no significant effects on sodium and chloride concentration of cotton plant at all four NaCl levels.Isolate M2 significantly improved plant growth at 3g/kg NaCl and phosphorus concentration at 0 and 1g/kg NaCl respectively,meanwhile it significantly increased sodium concentration at 2 and 3g/kg NaCl and chloride concentration at 1,2 and 3g/kg NaCl as well.For the two isolates,cotton plant inoculated with isolate M1 had significant higher biomass and phosphorus concentration,but lower sodium and chloride concentration than that of inoculating with isolate M2 at 2 and 3g/kg NaCl.These are the main mechanisms by which the two isolates had different effects on salinity tolerance of cotton plant.It is concluded that the potential of arbuscular mycorrhizal fungus in enhancing the salinity tolerance of plant is related to the biological characteristics of the fungus itself.