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The relationship between soil texture and the degree of apple replant disease (ARD) was analyzed from the perspective of the microbial community structure and diversity within the rhizosphere soil of  Malus hupehensis  Rehd. seedlings. Three different textured soils were taken from different apple orchards in Laizhou, Yantai. The soils were divided into two parts, one was kept in replanted conditions, and the other was fumigated with methyl bromide to act as a high standard control. The strength of ARD occurrence was examined by measuring fresh and dry weight suppression (%) of the  M. hupehensis  seedlings. Differences in the fungal community structure (especially in  Fusarium ) among the three soil texture types were analyzed using high-throughput sequencing. The results showed that replanted loam clay soil had the highest fungal diversity, followed by sandy loam soil and finally loam soil. The richness of fungi between soil textures, however, was not significantly different. At the genus level, the relative abundance of  Fusarium  was 1.96%, 0.78%, and 10.89% in replanted sandy loam, replanted loam soil, and replanted loam clay soil, respectively. Moreover, the gene copy number of  Fusarium oxysporum ,  Fusarium solani , and the inhibition rate of fresh weight of  M. hupehensis  seedlings were the same in the three soil textures. The plant height, photosynthesis (net) (P n ), and stomatal conductance ( g  S ) of the  M. hupehensis  seedlings were significantly less in the replanted soil compared with the control treatments, with the overall difference being greatest in replanted loam clay soil, followed by replanted sandy loam and then replanted loam soil.

Impact of Three Soil Textures on the Fungal Community Structure in Rhizosphere Soils of Malus hupehensis Rehd. Seedlings