两种药剂处理对魔芋软腐病的防治效果及对土壤微生物群落特征的影响

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中图分类号：S539 文献标识码：A 文章编号：0488-5368（2025）12-0088-07

Abstract： To evaluate the eficacy of two agents in controlling konjac soft rot and to assesstheir impacts on thesoil microbial community，a field trial was conducted usinga chemical agent （thiamethoxam）anda biological agent containing pectin oligosaccharides and ETS microbial inoculants.High-throughput sequencing was used to analyze the diversity，composition，and stabilityof bacterial and fungal communities inthesoil.Theresults demonstrated that both treatments significantly reduced the incidence of soft rot in konjac plants.The control efficacy was 55.75% for thiamethoxam and 43.81% for the pectin oligosaccharide/ETS compound. However，theapplicationof thiamethoxam led to decreased soil microbial diversity，whilethe biological agentsignificantly enhancedbacterial diversityand richness.The improvement inmicrobialcommunitystability was primarily due to changes inbacterial diversityandtherelativeabundance of dominant taxa.The biological treatment mainly controlled the diseaseby reducing theabundance of Proteobacteria and Acidobacteriaand increasing Firmicutes.These findings provide a scientific basis for the green and integrated management of konjac soft rot.

Key words：Konjac;Soft rot；Agents；Soil microbiota

魔芋（AmorphophalluskonjacK.Koch）又名蒟、鬼芋，是自然界唯一能够合成大量葡苷聚糖的植物，葡苷聚糖（Konjac glucomannan，KGM）是一种重要的膳食纤维，广泛应用于多种领域[1.2]。（剩余9609字）