Direct and indirect influence of arbuscular mycorrhizal fungi on abundance and community structure of ammonia oxidizing bacteria and archaea in soil microcosms

文献类型： 外文期刊

第一作者： Chen, Yong-Liang

作者： Chen, Yong-Liang;Chen, Bao-Dong;Hu, Ya-Jun;Li, Tao;Zhang, Xin;Hao, Zhi-Peng;Wang, You-Shan

作者机构：

关键词： Ammonia-oxidizing archaea;Ammonia-oxidizing bacteria;Arbuscular mycorrhizal fungi;Microbial community structure;Soil nitrogen cycling

期刊名称：PEDOBIOLOGIA （ 影响因子：1.812； 五年影响因子：3.096 ）

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收录情况： SCI

摘要： Both arbuscular mycorrhizal (AM) fungi and ammonia oxidizers are important soil microbial groups in regulating soil N cycling. However, knowledge of their interactions, especially the direct influences of AM fungi on ammonia oxidizers is very limited to date. In the present study, a controlled microcosm experiment was established to examine the effects of AM fungi and N supply level on the abundance and community structure of ammonia oxidizing bacteria (AOB) and archaea (AOA) in the rhizosphere of alfalfa plants (Medicago sativa L.) inoculated with AM fungus Glomus intraradices. Effects were studied using combined approaches of quantitative polymerase chain reaction (qPCR) and terminal-restriction fragment length polymorphism (T-RFLP). The results showed that inoculation with AM fungi significantly increased the plant dry weights, total N and P uptake. Concomitantly, AM fungi significantly decreased the amoA gene copy numbers of AOA and AOB in the root compartment (RC) but not in the hyphal compartment (HC). Moreover, AM fungi induced some changes in AOA community structure in HC and RC, while only marginal variations in AOA composition were observed to respond to N supply level in HC. Neither RC nor HC showed significant differences in AOB composition irrespective of experimental treatments. The experimental results suggested that AM fungi could directly shape AOA composition, but more likely exerted indirect influences on AOA and AOB abundance via the plant pathway. In general, AM fungi may play an important role in mediating ammonia oxidizers, but the AOA community appeared to be more sensitive than the AOB community to AM fungi.

分类号： S154

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