Effects of Endophytic Fungi in Aleurites montana on Different Aluminum Forms in Rhizosphere Soil under Aluminium Stress
[Objective]This study aims to investigate the effects of endophytic fungi on different forms of aluminum in rhizosphere soil under different aluminium stress levels.[Method]Five dominant endo-phytic fungal strains isolated from Aleurites montana were cultured as fungal solutions and applied to pot-ted A.montana seedlings under different aluminum levels,including 0 mmol/L(A0),0.555 mmol/L(A1),0.745 6 mmol/L(A2),1.111 mmol/L(A3)and 1.852 mmol/L(A4).The effects of endophytic fungi on the contents and proportions of different forms of active aluminum in rhizosphere soil were inves-tigated by measuring the contents of active aluminum in soil and the root activity of A.montana treated with different fungal solutions.[Result]Under non-aluminum stress(A0)condition,various endo-phytic fungi caused different levels of increase in the active aluminum contents in the rhizosphere soil of A.montana.The inoculation with Alternaria sp.led to a 20.58%reduction in exchangeable aluminum content in rhizosphere soil under A2 aluminum level compared to the non-inoculated treatments.Mean-while,the content of monomeric hydroxyl aluminum in Alternaria sp.-inoculated treatments was lower than that of the non-inoculated treatments across all aluminum levels,with reductions of 7.19%,19.56%,6.27%and 4.01%for A1,A2,A3 and A4,respectively.For Coniothyrium sp.and Thermomy-ces sp.treatments,the active aluminum contents in the rhizosphere soil were higher compared to the non-inoculated treatments.Different fungal inoculation treatments had varying effects on the root activity of A.montana,among which the root activity inoculated with Coniothyrium sp.was 11.27%higher than that of the non-inoculated treatments,while the root activity inoculated with Pestalotiopsis sp.showed no signifi-cant difference compared with that of non-inoculated treatments.[Conclusion]These findings show that inoculation with endophytic fungi could change the content and proportion of active aluminum in rhizo-sphere soil.Alternaria sp.could effectively reduce the content of monomeric hydroxy aluminum in rhizo-sphere soil,while Coniothyrium sp.and Thermomyces sp.increase the active aluminum contents.The ef-fectiveness of endophytic fungi are influenced by aluminum level,the genotype of endophytic fungi,and the types of hosts.The research results expand the exploration of the impacts of endophytic fungi on host rhizosphere soil,providing a reference for the in-depth study on tree-microorganism interaction.
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