丛枝菌根真菌对铝胁迫下蓝莓幼苗根系形态和光合特性的影响OA

Aluminum toxicity in acidic soils severely inhibits plant growth,while arbuscular mycor-rhizal fungi can significantly enhance plant adaptability under heavy metal stress.In this experiment,one-year-old'Draper'blueberry seedlings inoculated with two species of arbuscular mycorrhizal fungi,Funneliformis mosseae and Claroideoglomus etunicatum,were subjected to six different concen-trations of aluminum(Al3+)stress:0,2,4,6,8,and 10 mmol/L.The effects of arbuscular mycorrhizal fungi on growth performance,root morphology,and photosynthetic characteristics of blueberry seed-lings under aluminum stress were investigated.The results showed that arbuscular mycorrhizal fungi significantly inhibited the activity of exchangeable Al3+in soil and increased the content of glomalin-related soil protein,thereby markedly enhancing root vitality,photosynthetic efficiency and chloro-phyll content in blueberry seedlings.The inoculation of arbuscular mycorrhizal fungi promoted seed-ling height and stem diameter growth,with main root length increasing by 17.55%-42.26%,root vol-ume by 10.35%-43.20%,and root dry weight by 20.91%-60.76%,all of which were significantly higher than those of the control group(P<0.05).Additionally,it was observed that low concentrations of Al3+treatment had a certain promoting effect on the growth of blueberry seedlings.However,alumi-num toxicity occurred as growth inhibition at a concentration of 8 mmol/L,a condition that could be alleviated by arbuscular mycorrhizal fungi.In conclusion,under different concentrations of Al3+treat-ment,arbuscular mycorrhizal fungi were able to promote the growth of blueberry seedlings and their root systems,enhance photosynthetic efficiency,and reduce the content of exchangeable Al3+in soil under high Al3+concentrations,thereby mitigating aluminum toxicity.The inoculation with Funneli-formis mosseae demonstrated better effects.