Quantitative estimation of the contribution of the phloem in cadmium transport to grains in rice plants (Oryza sativa L.)

  1. Kensuke TANAKA†,
  2. Shu FUJIMAKI‡,
  3. Toru FUJIWARA§,
  4. Tadakatsu YONEYAMA,
  5. Hiroaki HAYASHI

Article first published online: 11 JAN 2007

DOI: 10.1111/j.1747-0765.2007.00116.x

Issue

Soil Science & Plant Nutrition

Soil Science & Plant Nutrition

Volume 53, Issue 1, pages 72–77, February 2007

Additional Information

How to Cite

TANAKA, K., FUJIMAKI, S., FUJIWARA, T., YONEYAMA, T. and HAYASHI, H. (2007), Quantitative estimation of the contribution of the phloem in cadmium transport to grains in rice plants (Oryza sativa L.). Soil Science & Plant Nutrition, 53: 72–77. doi: 10.1111/j.1747-0765.2007.00116.x

Author Information

  1. Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan

    Process Development Department, Engineering and Process Development Division, Suntory Limited, 57 Imaikami-cho, Nakahara-ku, Kawasaki, Kanagawa 211-0067, Japan. ‡Radiation-Applied Biology Division, Quantum Beam Science Directorate and Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan. §Biotechnology Research Center, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan and Solution Oriented Research for Science and Technology (SORST), Japan Science and Technology Agency (JST). 694 Futago, Aki, Kunisaki, Oita 873-0356, Japan.

* : Dr S. FUJIMAKI, Radiation-Applied Biology Division, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan. Email: fujimaki.shu@jaea.go.jp

Publication History

  1. Issue published online: 11 JAN 2007
  2. Article first published online: 11 JAN 2007
  3. Received 9 August 2006. Accepted for publication 29 October 2006.

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Keywords:

  • cadmium;
  • grain;
  • phloem;
  • rice (Oryza sativa L.);
  • translocation

Abstract

The contribution of the phloem in translocation of cadmium (Cd) to grains of rice plants (Oryza sativa L. cv. Kantou) was estimated. We measured Cd concentrations in phloem sap collected from the uppermost internode of rice plants at the grain-filling stage. Cadmium concentration was 17.8 ± 4.5 µmol L−1 in plants treated with a nutrient solution containing 10 µmol L−1 Cd for 2 days. Subsequently, distribution ratios of 109Cd between the grains and the glumes were determined after feeding of 109Cd to the cut ends of the uppermost internodes or onto the surface of the flag leaves or to the roots. The results suggested that 91–100% of the Cd in the grains was deposited from the phloem. To our knowledge, this is the first determination of Cd concentrations in phloem sap transported to grains, and the first estimation of the contribution of the phloem in Cd transport to rice grains.

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