Journal Article

Photoregulation of Asymmetric Cell Division Followed by Rhizoid Development in the Fern <i>Ceratopteris</i> Prothalli

Takashi Murata and Michizo Sugai

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 12, pages 1313-1320
Published in print December 2000 | ISSN: 0032-0781
Published online December 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcd063
Photoregulation of Asymmetric Cell Division Followed by Rhizoid Development in the Fern Ceratopteris Prothalli

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  • Biochemistry
  • Molecular and Cell Biology

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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.

Keywords: Key words: Asymmetric division — Ceratopteris — Fern gametophyte — Phytochrome – Rhizoid.; Abbreviations: B, blue light; DAPI, 4,6-diamidinophenylindole; FR, far-red light; HIR, high irradiance response; LFR, low-fluence response; R, red light, VLFR, very low-fluence response; W, white light.

Journal Article.  5087 words.  Illustrated.

Subjects: Plant Sciences and Forestry ; Biochemistry ; Molecular and Cell Biology

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