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Plant and Cell Physiology, 2000, Vol. 41, No. 12 1313-1320
© 2000 Oxford University Press

Photoregulation of Asymmetric Cell Division Followed by Rhizoid Development in the Fern Ceratopteris Prothalli

Takashi Murata ,1,3 and Michizo Sugai2

1 Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, 153-8902 Japan 2 Department of Biology, Faculty of Science, Toyama University, Toyama, 930-8555 Japan

Strap-shaped prothalli of Ceratopteris richardii grown in the dark have an apical meristem, a subapical elongation zone and a basal growth cessation zone [Murata et al. (1997) Plant Cell Physiol. 38: 201]. When the dark-grown prothalli were irradiated with continuous white light, marginal cells of the elongation zone divided asymmetrically, and the resulting smaller cells developed into rhizoids. The asymmetric division was also induced by brief irradiation of red light. The effect of red light was cancelled by subsequent irradiation of far-red light, indicating that the asymmetric division was regulated by phytochrome. Since the response to red light was not observed at 101 J m–2 and saturated at 102 J m–2 and the response is photoreversible by far-red light, the photoresponse was classified as a low-fluence response of phytochrome. Although the asymmetric division was induced by brief irradiation of red light, continuous irradiation of white, blue or red light was necessary to induce rhizoid growth. These results indicate that asymmetric division and subsequent cell growth are independently regulated by light in Ceratopteris prothalli.

3 Corresponding author: E-mail, ctmura@bio.c.u-tokyo.ac.jp; Fax, +81-3-5454-6647.


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