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Analysis of bacterial communities associated with spores of Gigaspora margarita and Gigaspora rosea

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Abstract

The spores of arbuscular mycorrhizal fungi (AMF) form a unique microhabitat that is suitable for the colonization by many species of bacteria. The aim of the current study was to analyze the bacterial communities associated with the surface of spores of the AMF species Gigaspora margarita MAFF 520054 and Gigaspora rosea JP1. The two AMF species were propagated with tobacco (Nicotiana tabacum) grown in a mixture of sand and soil. In another experiment, G. margarita was propagated with tobacco or alfalfa (Medicago sativa) grown in vermiculite or a mixture of sand and soil. The bacterial community composition of the new-formed spores and sand/soil substrate was analyzed using PCR of 16S rDNA fragments and denaturing gradient gel electrophoresis (DGGE). Clustering analysis revealed that the bacterial communities on the surface of G. margarita spores was different form that in the substrate or on the surface of the G. rosea spores, and both the host plant and the substrate could influence the composition of spore-associated bacterial populations of the G. margarita. Sequence analysis of the major DGGE bands of G. margarita spore samples revealed that most of the bacterial sequences were affiliated with the phyla Proteobacteria (Azospirillum, Azovibrio, Polyangium, Ramlibacter, Rubrivivax, Sphingomonas, and Rhizobium) and Actinobacteria (Streptomyces, Amycolatopsis, and Pseudonocardia).

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Acknowledgments

Financial support was provided by the Natural Science Foundation of Guangdong Province, China (No. E05202480, 07000509).

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Correspondence to Yuncan Ai.

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Responsible Editor: David E. Crowley.

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Long, L., Zhu, H., Yao, Q. et al. Analysis of bacterial communities associated with spores of Gigaspora margarita and Gigaspora rosea . Plant Soil 310, 1–9 (2008). https://doi.org/10.1007/s11104-008-9611-7

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