摘要:本研究通过在伽马射线灭菌的香蕉抑病土壤和导病土壤中,分别接种不同浓度抑病土壤悬液培养2个月后,获得具有不同细菌和真菌丰度的两种土壤,然后在不同处理中接种相同浓度的病原菌孢子悬液进行室内培养,研究土壤微生物多样性与病原菌入侵直接的关系。研究结果表明,土壤理化对微生物群落建成有显著影响,在抑病土壤中,稀释不同倍数培育的微生物差异,可能是抑病型微生物抑制病原菌入侵的关键。30126 毕业论文关键词:土壤微生物;香蕉枯萎病;导病土壤;抑病土壤;尖孢镰刀菌
Research on pathogen suppression caused by disease-suppressive soil microbial persity
Abstract: In this study, we first added different concentrations of suppressive soil suspension to conducive soil and suppressive soil, specifically, 5 times diluted concentration to conducive soil(CF1) and suppressive soil(SF1), 50 times diluted concentration to conducive soil(CF2) and suppressive soil(SF2), 500 times diluted concentration to conducive soil(CF3) and suppressive soil(SF3), 5000 times diluted concentration to conducive soil(CF4) and suppressive soil(SF4). After culturing 2 months, the soils were treated with 105 (dry soil) pathogenic spore, then qPCR analysis.was used to explore the gene copies of soil bacteria, fungi and fusarium. The results showed that although added same microbe, the feedback was totally different between disease-conducive and disease-suppressive soil. Therefore, soil physical and chemical properties had a significant effect on the built of soil microbial community, the differences of soil microbe in SF3 and SF4 may be the key to explore soil suppression.
Key words: Soil microbes; fusarium wilt of banana; Disease conducive soil; Disease suppression soil; Fusarium oxysporum
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