Plant and Cell Physiology, 2002, Vol. 43, No. 2 239-244
© 2002 Oxford University Press
Short Communications |
Brassinosteroids Control the Proliferation of Leaf Cells of Arabidopsis thaliana
1 Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo, 113-0033 Japan 2 National Institute for Basic Biology/Center for Integrative Bioscience, Myodaiji-cho, Okazaki, 444-8585 Japan 3 Additional affiliations: ‘Form and Function’, PRESTO, Japan Science and Technology Corporation, Japan, and School of Advanced Sciences, the Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa, 240-0193 Japan 4 Laboratory of Plant Taxonomy and Evolution, Department of Botany, Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan
Abstract
The growth of leaves in the model plant, Arabidopsis thaliana (L.) Heynh., is determined by the extent of expansion of individual cells and by cell proliferation. Mutants of A. thaliana with known defects in the biosynthesis or perception of brassinosteroids develop small leaves. When the leaves of brassinosteroid-related mutants, det2 (de-etiolated2 = cro1) and dwf1 (dwarf1 = cro2) were compared to wild-type plants, an earlier cessation of leaf expansion was observed; a detailed anatomical analysis further revealed that the mutants had fewer cells per leaf blade. Treatment of the det2 mutants with the brassinosteroid, brassinolide, reversed the mutation and restored the potential for growth to that of the wild type. Restoration of leaf size could not be explained solely on the basis of an increase in individual cell volume, thus suggesting that brassinosteroids play a dual role in regulating cell expansion and proliferation.
Footnotes
5 Present address: Research Laboratory for Packaging, Technology Development Department, Production Division, Kirin Brewery Co., Ltd. 1-17-1 Namamugi Tsurumi-ku, Yokohama, 230-8628 Japan
6 Corresponding author: E-mail, tsukaya@nibb.ac.jp; Fax, +81-564-55-7512.
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