From recent research, we know that plants respond to environmental changes such as low nitrogen, and select symbiotic microorganisms. When microorganisms acquire symbiotic associations with plants, they acquire an enhanced risk of genome instability. Even more interestingly, plant root-associated microbes are deeply connected to N and C transformation in the rhizosphere, wherein greenhouse gases (N2O and CH4) are produced and extinguished. My aim is to discover diversity and functions of dynamic plant-associated microorganisms, and to develop multidisciplinary sciences for application to environmental microbiology for the purposes of sustainable agriculture and environmental conservation.
1983 Assistant Professor, Faculty of Agriculture, Ibaraki University
1990 Associate Professor, Faculty of Agriculture, Ibaraki University
1996 Professor, Institute of Genetic Ecology, Tohoku University
2001 Professor, Graduate School of Life Science, Tohoku University
- Minamisawa et al. 2016. Are symbiotic methanotrophs key microbes for N acquisition in paddy rice root? Microbes Environ. 31: 4-10.
- Akiyama et al. 2016. Mitigation of soil N2O emission by inoculation with a mixed culture of indigenous Bradyrhizobium diazoefficiens. Scientific Reports 6: 32869.
- Igai et al. 2016. Nitrogen fixation and nifH diversity in human gut microbiota. Scientific Reports 6: 31942.
- Hidaka et al. 2015. Visualization of NO3－/NO2－ dynamics in living cells by fluorescence resonance energy transfer (FRET) imaging employing a rhizobial two-component regulatory system. J. Biol. Chem. 291: 2260-2269.
- Anda et al. 2015. Bacterial clade with the ribosomal RNA operon on a small plasmid rather than the chromosome. Proceedings of the National Academy of Sciences, 112: 14343-14347.
- Iida et al. 2015. Symbiosis island shuffling with abundant insertion sequences in the genomes of extra-slow-growing strains of soybean bradyrhizobia. Appl. Environ. Microbiol. 81:4143-4154.
- Okubo et al. 2015. Elevated atmospheric CO2 levels affect community structure of rice root-associated bacteria. Front. Microbiol. 6: 136.
- Shiina et al. 2014. Correlation between soil type and N2O reductase genotype (nosZ) of indigenous soybean bradyrhizobia: nosZ-minus populations are dominant in Andosols. Microbes Environ. 29: 420-426.
- Sanchez et al. 2014. The nitrate-sensing NasST system regulates nitrous oxide reductase and periplasmic nitrate reductase in Bradyrhizobium japonicum. Environ. Microbiol. 16: 3263-3274
- Bao et al. 2014. Metaproteomic identification of diazotrophic methanotrophs and their localization in root tissues of field-grown rice plants. Appl. Environ. Microbiol. 80: 5043-5052. (Research Highlight selected)
- Bao et al. 2014. A rice gene for microbial symbiosis, Oryza sativa CCaMK, reduces CH4 flux in a paddy field with low nitrogen input. Appl. Environ. Microbiol. 80: 1995-2003. (Research Highlight selected)
- Ikeda et al. 2014. Low nitrogen fertilization adapts rice root microbiome to low nutrient environment by changing biogeochemical functions. Microbes Environ. 29: 50-59.
- Itakura et al. 2013. Mitigation of nitrous oxide emissions from soils by Bradyrhizobium japonicum inoculation. Nature Climate Change 3: 208-212.
- Okubo et al. 2013. Genome anlaysis suggests that the soil oligotrophic bacterium Agromonas oligotrophica (Bradyrhizobium oligotrophicum) is a nitrogen-fixing symbiont of Aeschynomene indica. Appl. Environ. Microbiol. 79: 2542-2551.
- Ikeda, S., T. Ohkubo, T. Kaneko, S. Inaba, T. Maekawa, S. Eda, S. Sato, S. Tabata, H. Mitsui, and K. Minamisawa. 2010. Community shifts of soybean stem-associated bacteria responding to different nodulation phenotypes and N levels. ISME Journal 4: 315-26.
- Itakura et al. 2009. Genomic comparison of Bradyrhizobium japonicum strains with different symbiotic nitrogen-fixing capabilities and other Bradyrhizobiaceae members. ISME J. 3: 326-339.
Activities in Academic Societies
Japanese Society of Microbial Ecology, Japan Society of Plant Microbe Interactions, Japan Society of Soil Science and Plant Nutrition, Japanese Society of Soil Microbiology, Japan Society for Bioscience, Biotechnology and Agrochemistry, International Society of Microbial Ecology (ISME)