Geochemical cycles and sustainability of agricultural ecosystems from a view point of plant microbiology
2019
Ikeda, S. (Hokkaido Agricultural Research Center, NARO (Japan))
Diverse microorganisms are living as endophytes in plant tissues and as epiphytes on plant surfaces in nature. Analytical methods for plant associated bacterial community have been advanced by combining a bacterial cell enrichment procedure and culture-independent analyses in microbial ecology. In the present review, the ecological significance of plant microbiomes is briefly summarized. Then, the results for interdisciplinary works on the global diversity of bacteria associated with rice plants with different nitrogen application levels and symbiotic genotypes are discussed. A subpopulation of Alphaproteobacteria, such as Rhizobiales bacteria, was likely to be regulated through both the regulation systems for the nitrogen and the symbiosis signaling pathways, suggesting that each of crops accommodate a taxonomically characteristic microbial community through unknown plant-microbe communications. The significance and perspectives of community-based approaches are discussed to achieve sustainable agricultural system by a better understanding of plant-microbe interactions.
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