Changes in the mycorrhizal fungal community in host roots over five host generations under low and high phosphorus conditions

文献类型： 外文期刊

第一作者： Liu, Shijun

作者： Liu, Shijun;Xu, Jing;Huang, Hong;Zhu, Jiani;Tang, Jianjun;Chen, Xin;Xu, Jing

作者机构：

关键词： Arbuscular mycorrhizal fungi; Host multi-generations; Community change; Mycorrhizal dependency; Low phosphorus environment; Medicago truncatula

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2020 年 456 卷 1-2 期

页码：

收录情况： SCI

摘要： Aims We tested whether arbuscular mycorrhizal fungal (AMF) community might shift as host plant generations advance under a low phosphorus (P) soil. Methods Two greenhouse experiments were conducted usingMedicago truncatulaas the host plant, six AMF species, and two soil P levels. Experiment 1 assessed changes in AMF composition in roots and soil during five generations of host plant grown in low-P (5.7 mg kg(-1)) and high-P soil (24.0 mg kg(-1)). Experiment 2 tested the effects of single AMF species on host plant growth in low-P and high-P soil. Results Experiment 1 showed that AMF species composition at the OTU level in roots and soil significantly changed as host generations advanced, and that the pattern of change differed in low-P vs. high-P soil. In low-P soil, the dominant OTU in both roots and soil shifted from OTU-50 (Glomus tortuosum) to OTU-49 (Funneliformis geosporum) as host generations advanced. In high-P soil, the AMF community in roots and soil was dominated by OTU-50 in first two generations but OTU-49 and OTU-50 were co-dominant in the last three generations. Experiment 2 showed that mycorrhizal dependency indices based on plant biomass and P content in plant biomass, and spore numbers were higher in host plants withF. geosporumthan other AMF fungal treatments in low-P soil. Conclusion As the hostM. truncatulagrew in a low-P soil over five generations, AMF community in root and soil shifted to a composition withF. geosporumas dominant species who was effective in foraging for P.

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