Department of Environmental Life Sciences
Division of Genetic Ecology

Environmental Microbiology 分野

Masayuki Sugawara
キャンパス Katahira キャンパス
専攻分野 Soil Microbiology, Genome Microbiology
連絡先 022-217-5687

I have returned to my hometown for the first time in seven years. I spent my graduate student days in this laboratory, and was working on the study of the symbiotic interactions of root nodule bacteria and legumous plants. In my postdoctoral fellow days, I have studied not only root nodule bacteria but also various beneficial bacteria, and I was further attracted to the potential capacity of microorganisms to do plant growth promotion and environmental cleanup. My aim is to gain a better understanding of the mechanisms of symbiotic interactions between microbes and plants.


1997.4 – 2001.3   Ishinomaki Senshu University, Faculty of Science and Engineering (B.S)
2001.4 – 2003.3   Tohoku University, Graduate School of Life Sciences, (M.S. in Life Sciences) 
2004.4 – 2007.3   Tohoku University, Graduate School of Life Sciences, (Ph.D. in Life Sciences) 
2007.5 – 2012.3   Postdoctoral fellow, University of Minnesota, BioTechnology Institute
2012.4 – 2014.5   Postdoctoral fellow, Hokkaido University, Faculty of Environmental Earth Science 
2014.6 – current    Assistant Professor, Tohoku University, Graduate School of Life Sciences

  1. Suzuki W, Sugawara M, Miwa K, Morikawa M. Plant growth-promoting bacterium Acinetobacter calcoaceticus P23 increases the chlorophyll content of the monocot Lemna minor (duckweed) and the dicot Lactuca sativa (lettuce). J. Biosci. Bioeng. (in press)
  2. Sugawara M, Sadowsky MJ. Enhanced nodulation and nodule development by nolR mutants of Sinorhizobium medicae on specific Medicago host genotypes. Mol. Plant Microbe Interact. 27:328-335 (2014)
  3. Sugawara M, Epstein B, Badgley BD, Unno T, Xu L, Reese J, Gyaneshwar P, Denny R, Mudge J, Bharti AK, Farmer AD, May GD, Woodward JE, Médigue C, Vallenet D, Lajus A, Rouy Z, Martinez-Vaz B, Tiffin P, Young ND, Sadowsky MJ. Comparative genomics of the core and accessory genomes of 48 Sinorhizobium strains comprising five genospecies. Genome Biol. 14: R17 (2013)
  4. Sugawara M, Sadowsky MJ. Influence of elevated atmospheric carbon dioxide on transcriptional responses of Bradyrhizobium japonicum in the soybean rhizoplane. Microbes Environ. 28: 217-227  (2013)
  5. Sugawara M, Shah GR, Sadowsky MJ, Paliy O, Speck J, Vail AW, Gyaneshwar P. Expression and functional roles of Bradyrhizobium japonicum genes involved in the utilization of inorganic and organic sulfur compounds in free-living and symbiotic conditions. Mol. Plant Microbe Interact. 24: 451-457  (2011)
  6. Sugawara M, Cytryn EJ, Sadowsky MJ. Functional role of Bradyrhizobium japonicum trehalose biosynthesis and metabolism genes during physiological stress and nodulation. Appl. Environ. Microbiol. 76: 1071-1081 (2010)
所属学会 Japan Society for Environmental Biotechnology, American Society for Microbiology, Japanese Society of Microbial Ecology
担当講義 Coexisting Gene Ecology (graduate students)


Many bacteria live in soil environments, and many beneficial plant growth-promoting bacteria also reside there. The symbiotic relationship between microorganisms and plants plays an important role for sustainable food production. In particular, bacteria belonging to the Bradyrhizobium genus are known to have a deep relationship with plants. Although the Bradyrhizobium strain is generally known as a nitrogen-fixing root nodule bacterium, it turns out that many plant-associated bacteria, such as endophytes, plant growth-promoting rhizobacteria, and Aeschynomene nodule symbionts also belong in the genus. My aim is to gain a better understanding of the mechanisms of symbiotic interactions of the Bradyrhizobium strain and plants.