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Journal of Experimental Botany, Vol. 53, No. 369, pp. 683-687, April 1, 2002
© 2002 Oxford University Press

Original Papers

Positional effect of cell inactivation on root gravitropism using heavy-ion microbeams

Atsushi Tanaka1, Yasuhiko Kobayashi, Yoshihiro Hase and Hiroshi Watanabe

Department of Radiation Research for Environment and Resources, Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute (JAERI), Watanuki-machi 1233, Takasaki, Gunma 370-1292, Japan

When primary root apical tissues of Arabidopsis thaliana were irradiated by heavy-ion microbeams with 120 µm diameter, strong inhibition of root elongation and curvature were observed at the root tip. Irradiation of the cells that become the lower part of the root cap after gravistimulation showed strong inhibition of root curvature, whereas irradiation of the cells that become the upper part of the root cap after gravistimulation did not show severe damage in either root curvature or root growth. Further analysis using smaller area microbeams with 40 µm diameter indicated that the greatest inhibition of curvature occurred at the root tip and the next greatest inhibition occurred in the cells in the lower part of the root cap. These results indicate not only that the root tip and columella cells are the most sensitive sites for root gravity, but also that signalling of root gravity would go through the lower part of the cap cells after perception.

Key words: Arabidopsis, heavy ions, microbeam, root gravitropism, signalling.


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