Effect of Ectomycorrhizal Fungi on Growth and Physiology of Pinus tabulaeformis Seedlings Under Saline Stress

Pinus tabulaeformis seedlings were grown in pots under different Na levels(0.06 mol·L-1,0.12 mol·L-1 and 0.24 mol·L-1).The seedlings were inoculated with or non-ectomycorrhizal fungi(Boletus edulis and Xerocomus chrysenteron).Through analyzing the growth and physiological characteristics of ectomycorrhizal Pinus tabulaeformis,the result showed: in contrast with non-mycorrhizal seedlings,at different Na levels,ectomycorrhiza promoted the growth of seedlings and improved the dry weight by 25.55%,30.96%,61.86% and 15.62%,3.06%,17.04% respectively;and there were no significant differences in the membrane permeability of ectomycorrhizal seedlings,but the ways of influencing the membrane permeability by two ectomycorrhizal fungi were different,the membrane permeability of B.edulis ectomycorrhizal seedlings increased gradually while little difference in the X.chrysenteron ectomycorrhizal seedlings was found with the Na levels increasing;the abilities of absorbing water by ectomycorrhizal seedlings were enhanced with reduced relative ratios of lacking water;the bleeding amount of ectomycorrhizal seedlings increased significantly contrasted with non-mycorrhizal seedlings,being 1.10,1.24 and 1.23 times of non-mycorrhizal ones for the B.edulis ectomycorrhizal seedlings respectively,and increasing by 2.85%,10.48% and 7.48% for the X.chrysenteron ectomycorrhizal seedlings.So mycorrhizae could improve the stability of the membrane permeability,enhance the energy of root system of ectomycorrhizal plants,increase the absorption of water and alleviate the physiological drought to promote the seedlings growth under salt stress.