| Arbuscular Mycorrhizas Fungi(AMF),as one of the main drivers of terrestrial ecosystems,are widely distributed in soil,symbiotic with herbs and woody plants,and can play an important ecological role.In recent years,Malus sieversii and Armeniaca vulgaris have faced problems such as pests and diseases,and difficulty in seedling renewal.Focusing on the above problems,this paper conducts an AMF diversity survey in Gongliu fruit forest in Xinjiang,and analyzed the disease resistance of AMF dominant genus to two wild tree species was evaluated.The main results are as follows:1.There are abundant AMF resources in the adjacent soil of the adult plants of M.sieversii and A.vulgaris in Gongliu wild fruit forest in Xinjiang,and 22 AMF have been found.Among them,18 AMF were identified in the soil adjacent to the adult plant of M.sieversii,and 17 AMF were identified in the soil adjacent to the adult plant of A.vulgaris.Glomus is the dominant genus around the two tree species.The density of AMF spores in the soil adjacent to the adult plant of M.sieversii was 46 per 25 g soil,and the density of AMF spores in the soil adjacent to the adult plant of A.vulgaris was 25 per 25 g soil,the two are significantly different.2.Spotted leaf disease is the most common disease of M.sieversii,which has been identified as Alternaria alternata;fungal perforation disease is the most common disease of A.vulgaris,which has been identified as Wilsonomyces carpophilus.The results show that the survival rate of M.sieversii seedlings under the M.sieversii is 28.6%,and the survival rate under the A.vulgaris adult plant is 36.7%.Leaf disease are the main cause of the death of M.sieversii.3.The indoor potted inoculation test results showed that M.sieversii seedlings can be infected with leaf spot and fungal perforation disease,and A.vulgaris seedlings can only be infected with fungal perforation disease.The infection of pathogenic bacteria can inhibit the growth of two seedlings.Inoculation with Glomus can increase the plant height growth of M.sieversii and A.vulgaris by 30.2% and 11.85% on average;inoculation with Glomus can reduce the incidence area of M.sieversii and A.vulgaris seedlings by 47.05% and 29.7% on average;after inoculation with Glomus,the relative growth rate of M.sieversii seedlings increased by 27% on average,and the relative growth rate of A.vulgaris seedlings increased by an average of 2 times..To sum up,AMF resources are abundant around the two wild fruit trees in Gongliu wild fruit forest in Xinjiang,and the AMF species of the host tree species are also different,and the spore density is also significantly different.Spotted leaf disease and fungal perforation disease can inhibit the growth of two seedlings of M.sieversii and A.vulgaris,while Glomus as the dominant genus,could improve the disease resistance of the two seedlings.This phenomenon has certain significance for the conservation and management of wild fruit forest species diversity. |
