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    烟草青枯病发病土壤理化性状及细菌群落结构分析

    Analysis of Soil Physical and Chemical Properties and Bacterial Community Structure with Tobacco Bacterial Wilt Infection

    • 摘要: 为了解土壤理化性状及细菌群落结构与青枯病发生的关系,在湖北恩施典型烟区采集了160个植烟土壤(82个未发病土壤,78个发病土壤),检测了土壤理化指标,并采用16S rRNA基因测序技术分析了烟株发病与未发病根际土壤细菌群落结构的差异。结果表明:(1)与未发病土壤相比,发病土壤细菌群落结构多样性更高。(2)发病土壤劳尔氏菌属(Ralstonia solanacearum)相对丰度显著高于未发病土壤,而鞘氨醇单胞菌属(Sphingomonas)、节杆菌属(Arthrobacter)和假单胞菌属(Pseudomonas)相对丰度则相反。(3)青枯病的发生使土壤微生物网络结构更复杂而稳定性降低,并改变了部分核心点位细菌种类。(4)典范对应分析(CCA)表明,土壤pH和速效磷(AP)可能是影响烟草青枯病发生的重要土壤因子。综上所述,土壤pH、AP与细菌SphingomonasArthrobacterPseudomonas相对丰度的增加和Ralstonia相对丰度的降低可能是减少烟田青枯病发病的关键因素。

       

      Abstract: In order to understand the relationship between soil physical and chemical properties, bacterial community structure and bacterial wilt, the physical and chemical indexes of 160 tobacco growing soils (82 rhizosphere soils of non-infected and 78 rhizosphere soils infected by bacterial wilt) were tested, and 16S rRNA gene sequencing technology was used to analyze the differences of bacterial community structure of the soils. The results showed that: (1) Compared with non-infected soils, the diversity of soil bacterial increased with the infection of tobacco bacterial wilt. (2) The relative abundance of Ralstonia was significantly improved in the rhizosphere soils infected by bacterial wilt, while Sphingomonas, Arthrobacter and Pseudomonas were of the opposite effects. (3) The complexity of microbial network structure was enhanced, while the stability decreased and the type of bacteria at the core point changed in rhizosphere soils with the infection of tobacco bacterial wilt. (4) CCA analysis indicated that soil pH and available phosphorus (AP) were the important factors affecting the occurrence of bacterial wilt. In conclusion, the increase of soil pH, AP and relative abundance of Sphingomonas, Arthrobacter, Pseudomonas and the decrease of Ralstonia might be the key factors to reduce the incidence of bacterial wilt in tobacco field.

       

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