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不同种植年限苹果根际土可培养根皮苷耐受菌的分布及多样性
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国家“948”重点项目(No. 2011-G30);现代农业产业技术体系建设专项资金项目(No. CARS-28);山东省自主创新和成果转化专项(No. 2014ZZCX07301)


Distribution and diversity of culturable phlorizin-resistant bacteria from apple rhizosphere soil in different planting years
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    摘要:

    【目的】筛选能够耐受苹果根系自毒物质根皮苷的细菌,研究不同种植年限苹果(Malus Mill.)根际可培养根皮苷耐受菌的微生物群落组成及多样性,旨在为筛选高效根皮苷降解菌、一定程度上了解苹果连作障碍机制并克服或减轻其造成的损失提供科学依据。【方法】以根皮苷为唯一碳源,筛选不同种植年限的根皮苷耐受细菌,通过ARDRA酶切聚类(Amplified rDNA restriction analysis)和16S rRNA基因序列分析确定分离的根皮苷耐受菌的分类地位,并利用生物信息学分析根皮苷耐受菌群落结构、多样性及与理化因子的关系。【结果】从种植年限为3、8、15、20和25年的苹果砧木山荆子[Malus baccata (Linn.) Borkh.]根际土壤中共分离103株根皮苷耐受菌,并在65%的相似水平上分成18个类群,分属于13个属,其优势菌分别为芽孢杆菌属(Bacillus)、假单胞菌属(Pseudomonas)和新鞘脂杆菌属(Novosphingobium)。分析发现种植年限为3年的根际土壤中分离的根皮苷耐受菌的物种丰富度最高,种植年限为15、20和25年的根际土壤中分离的根皮苷耐受菌的物种组成相似,且不同种植年限土壤的理化因子与根皮苷耐受菌的群落组成具有一定的相关性(P<0.05)。冗余分析(Redundancy analysis,RDA)表明阿魏酸是影响群落结构的重要因子。【结论】不同种植年限苹果根际土壤中根皮苷耐受菌种类多样性丰富,其群落组成与土壤理化因子具有一定相关性,阿魏酸是影响根皮苷耐受菌群落结构的重要环境因子。研究结果可为探讨缓解苹果连作障碍的途径提供基础资料。

    Abstract:

    [Objective] The experiment was designed to screen bacteria that could tolerate phlorizin and then study the diversity and composition of microbial community of phlorizin-resistant bacteria, which were isolated from the rhizosphere of Malus baccata in different years. Through the study, we aimed to find the potential efficient phlorizin-degrading strains and provide a scientific basis for understanding of the mechanism of continuous cropping obstacles in apple and to overcome or reduce the losses caused by it. [Methods] The phlorizin-resistant bacteria were isolated from five different years’ soils using phlorizin as the sole carbon source. The amplified rDNA restriction analysis (ARDRA) and 16S rRNA gene sequences and phylogeny analysis were employed to identify taxonomic status of phlorizin-resistant bacteria, while the distribution and diversity of the microbial community and its relationship with the physicochemical parameters were analyzed by bioinformatics analysis. [Results] A total of 103 distinct bacterial strains belonging to 13 genera were obtained from apple rhizosphere soil and they could be divided into 18 groups at 65% similarity. Bacillus, Pseudomonas and Novosphingobium were dominant genera. The result showed that rhizosphere soil which was continuously planted for 3 years had the highest diversity and the community composition of phlorizin-resistant bacteria was similar for those continuously planted for 15, 20, 25 years. Pearson analysis exhibited phlorizin-resistant bacteria had a certain correlation with the physicochemical parameters (P<0.05). The redundancy analysis (RDA) also indicated that ferulic acid was an important factor affecting phlorizin-resistant bacterial community structure. [Conclusion] The genetic diversity of phlorizin-resistant bacteria was abundant, and correlations were revealed between the phlorizin-resistant bacteria community structure and soil physicochemical factors. Ferulic acid was an important factor that could influence the community structure of phlorizin-resistant bacteria. This study provides some useful information for alleviating apple continuous cropping obstacles to some extent.

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李风娥,马艳芳,韩明渠,毛志泉,束怀瑞,高峥,周波. 不同种植年限苹果根际土可培养根皮苷耐受菌的分布及多样性[J]. 微生物学通报, 2016, 43(7): 1499-1512

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  • 在线发布日期: 2016-07-01
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