April 1, 2015


Tomohito ARAO, Dr.

Affiliation/Job Title

Principal Research Coordinator

Present research projects

Genotypic differences in cadmium levels of crops and mechanism of cadmium uptake by crops.
Biogeochemistry of arsenic in paddy soil and mechanism of arsenic uptake by rice.

Recent publication (after 2003)

(Refereed Publications)

  1. Baba, K., Arao T., Yamaguchi, N., Watanabe, E., Eun, H., Ishizaka, M. 2014. Chromatographic Separation of Arsenic Species with Pentafluorophenyl Column and Application to Rice. J. Chromatogr. A, DOI: 10.1016/j.chroma.2014.05.072
  2. Yamaguchi N., Ohkura T., Takahashi Y., Maejima Y., Arao T. 2014. Arsenic Distribution and Speciation near Rice Roots Influenced by Iron Plaques and Redox Conditions of the Soil Matrix. Environ Sci Technol., 48, 1549-1556.
  3. Ishikawa S., Ishimaru Y., Igura M., Kuramata M., Abe T., Senoura T., Hase Y., Arao T., Nishizawa N.K. and Nakanishi H. 2012. Ion-beam irradiation, gene identification, and marker-assisted breeding in the development of low-cadmium rice. Proc. Natl. Acad. Sci. (USA) 109, 19166-19171.
  4. Yamaguchi N., Ishikawa S., Abe T., Baba K., Arao T., Terada Y., 2012. Role of the node in controlling traffic of cadmium, zinc, and manganese in rice., J Exp Bot., 63, 2729-37
  5. Arao, T., Maejima, Y., and Baba, K. 2011. Reduction in uptake by rice and soybean of aromatic arsenicals from diphenylarsinic acid contaminated soil amended with activated charcoal. Environ. Pollut., 159, 2449-2453.
  6. Arao, T., Kawasaki, A., Baba, K., and Matsumoto, S. 2011. Effects of Arsenic Compound Amendment on Arsenic Speciation in Rice Grain. Environ. Sci. Tech., 45, 1291-1297.
  7. Maejima, Y., Murano, H., Iwafune, T., Arao, T., and Baba, K. 2011. Adsorption and mobility of aromatic arsenicals in Japanese agricultural soils. Soil Sci. Plant Nutri., 57, 429-435.
  8. Yamaguchi N., Mori S., Baba K., Kaburagi-Yada S., Arao T., Kitajima N., Hokura A. and Terada Y. 2011. Cadmium distribution in the root tissues of solanaceous plants with contrasting root-to-shoot Cd translocation efficiencies, Environ. Exp. Bot., 71, 198-206.
  9. Abe K., Nakamura K., Arao T., Sakurai Y., Nakano A., Suginuma C., Tawarada K. and Sasaki K. 2011. Immunochromatography for the rapid determination of cadmium concentrations in wheat grain and eggplant. J. Sci. Food Agric., 91, 1392-1397
  10. Maejima, Y., Arao, T., and Baba, K. 2011. Transformation of diphenylarsinic acid in agricultural soils. J. Environ. Qual., 40, 76-82.
  11. Yamaguchi, H., Fukuoka, H., Arao, T., Ohyama, A., Nunome, T., Miyatake, K., and Negoro, S. 2010. Gene expression analysis in cadmium-stressed roots of a low cadmium-accumulating solanaceous plant, Solanum torvum, J. Exp. Bot., 61, 423-437.
  12. Arao, T., Kawasaki, A., Baba, K., Mori, S., and Matsumoto, S. 2009. Effects of water management on cadmium and arsenic accumulation and dimethylarsinic acid concentrations in Japanese rice, Environ. Sci. Tech., 43, 9361-9367.
  13. Arao, T., Maejima, Y., and Baba, K. 2009. Uptake of aromatic arsenicals from soil contaminated with diphenylarsinic acid by rice, Environ. Sci. Tech., 43, 1097-1101.
  14. Mori, S., Uraguchi, S., Ishikawa, S., and Arao, T. 2009. Xylem loading process is a critical factor in determining Cd accumulation in the shoots of Solanum melongena and Solanum torvum, Environ. Exp. Bot., 67, 127-132.
  15. Mori, S., Kawasaki, A., Ishikawa, S., and Arao, T. 2009. A new method for evaluating symplastic cadmium absorption in roots of Solanum melongena using enriched isotopes 113Cd and 114Cd. Soil Sci. Plant Nutri., 55, 294-299.
  16. Murakami, M., Nakagawa, F., Ae, N., Ito, M., and Arao, T. 2009. Phytoextraction by rice capable of accumulating Cd at high levels: Reduction of Cd content of rice grain, Environ. Sci. Tech., 43, 5878-5883.
  17. Uraguchi, S., Mori, S., Kuramata, M., Kawasaki, A., Arao, T., and Ishikawa, S. 2009. Root-to-shoot Cd translocation via the xylem is the major process determining shoot and grain cadmium accumulation in rice, J. Exp. Bot., 60, 2677-2688.
  18. Arao, T., Takeda, H., and Nishihara, E. 2008. Reduction of cadmium translocation from roots to shoots in Eggplant (Solanum melongena) by grafting onto Solanum torvum rootstock, Soil Sci. Plant Nutri., 54, 555-559.
  19. Baba, K., Arao, T., Maejima, Y., Watanabe,E., Eun, H., and Ishizaka, M. 2008. Arsenic Speciation in Rice and Soil Containing Related Compounds of Chemical Warfare Agents. Anal. Chem., 80: 5768-5775.
  20. Yada, S., Arao, T., Kawasaki, A., Saito, T., Nagai, H., Mano, M., Hamada, Y. 2008. Natural cadmium loading and balance in a non-polluted rice paddy field in Japan. Water Sci Technol., 58, 2243-2249.
  21. Sugiyama, M., Ae, N., and Arao, T. 2007. Role of roots in differences in seed cadmium concentration among soybean cultivars-proof by grafting experiment, Plant Soil, 295, 1-11.
  22. Ishikawa S., Ae N., Sugiyama M., Murakami M., and Arao T. 2005. Genotypic variation in shoot cadmium concentration in rice and soybean in soils with different levels of cadmium contamination. Soil Sci. Plant Nutr., 51, 101-108.
  23. Arao, T., and Ae, N. 2003. Genotypic variations in cadmium levels of rice grain. Soil Sci. Plant Nutri., 49,473-479.
  24. Arao, T., Ae, N., Sugiyama, M., and Takahashi, M. 2003. Genotypic differences in cadmium uptake and distibution in soybeans. Plant Soil, 251,247-253.

(Other Articles and Publications)

  1. Arao, T., Kawasaki, A., Baba, K., and Matsumoto, S, Maejima, Y. 2011. Arsenic contamination in soils and crops in Japan and various countermeasures. Pedologist, 54, 202-213.
  2. Arao, T., Ishikawa, S., Murakami, M., Abe, K., Maejima, Y., and Makino, T. 2010. Heavy metal contamination of agricultural soil and countermeasures in Japan. Paddy Water Environ., 8, 247-257.
  3. Arao, T., and Ishikawa, S. 2006. Genotypic differences in Cd concentration and distribution of soybean and rice. Jpn. Agr. Res. Q., 40, 21-30.

Professional Awards

The 57th Achievement Award of the Japan Society of Soil Science and Plant Nutrition 2012