Resource And Salinity-Resistance Of Mycorrhizal Fungi At Common Plants In Saline Alkaline Soil Of Gansu Province

The resource and colonial characteristics of arbuscular mycorrhizal fungi (AMF) in saline alkaline soil of Gansu province was reported in this research. Effect of inoculating Robinia pseudoacacia with Glomus mosseae and effect of inoculating Pinus tabulaeformis with ectomycorrhizal fungi in the salt stress were analysised. The results are as follows:1. The arbuscular mycorrhizal status of 17 plant species in saline alkaline soil of Gansu province was surveyed. It was found that 94.1% of the plant species formed mycorrhiza. High densities of AM fungal spores in the rhizosphere soils, indicated that AMF were easy to sporulate and plants growth may be highly dependent on AMF in saline alkaline soil. The mycorrhizal structural types were correlated with the family of host plants, most of plants mycorrhizal types were the Arum-type (68.75%), whereas only 31.25% were the Paris-type, such as Liliaceae and Elaeagnaceae were the Arum-type, Poaceae and Iridaceae belonged to the Paris-type. The mycorrhizal colonization rate and spore density in the rhizosphere soils of plants in saline alkaline soil were influenced by the soil types, the mycorrhizal colonization rate and spore density in the rhizosphere soils of the same plant differed among soil types.2. 18 AMF species were isolated, which belong to 3 subjects, and 3 species not be undetermined. The Glomus is preponderant genus in the rhizosphere-soil of plants in saline alkaline soil.3. Glomus mosseae which were isolated from the rhizosphere-soil have very strongly infective ability to Robinia pseudoacacia in the salt stress. They could improve the survival rate and the growth of seedlings. Meantime, they could increase the content of chlorophyll, decrease the content of malondialdehyde and dissociative praline in shoot, improve the resistance to salt of Robinia pseudoacacia.4. We focused on the resistance of ectomycorrhizal fungus in vitro to salt. In the experiment, the growth mode, the growth rate, the mycelium biomasses, the accumulation of Na of three ectomycorhizal funguses were affected by different concentrations of salt. The results indicated that Boletus luridus which have strongly absorption to Na+ is the most tolerant to salt, the growth rate is the highest, and the mycelium biomasses is the most in the high salt concentration. The following is Suillus luteus, and the last one is Suillus bovines.5. The ectomycorrhizal fungi have very strongly infective ability to Pimus tabulaeformis in the salt stress. Inoculation of mycorrhizae enhanced the tolerance of plants to the saline environment, and promoting plants growth. Ectomycorrhiza improved the dry weight, increased the content of chlorophyll, decrease the content of malondialdehyde and dissociative praline in shoot, improve the resistance to salt of Pimus tabulaeformis.