Journal Article

Regulation of Root Growth by Gibberellin in <i>Lemna minor</i>

Sayaka Inada, Motoki Tominaga and Teruo Shimmen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 6, pages 657-665
Published in print June 2000 | ISSN: 0032-0781
Published online June 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/41.6.657
Regulation of Root Growth by Gibberellin in Lemna minor

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Hormonal control of root growth was studied in Lemna minor. Although addition of gibberellic acid (GA3) to the culture medium did not promote the root growth, a gibberellin biosynthesis inhibitor, uniconazole P (Un-P), significantly inhibited root growth. Both length and diameter of roots in Un-P-treated plants were significantly smaller than those in control plants, mainly caused by inhibition of cell division. In epidermal cells, the length was slightly decreased and the width increased by Un-P treatment, indicating inhibition of elongation growth. GA3 completely nullified the inhibition caused by Un-P. Transverse cortical microtubules (CMTs) of epidermal cells in the elongation zone were significantly fragmented by treatment with Un-P, but not by that in the presence of GA3. The cellulose microfibril array in the Un-P-treated cells was more random and more oblique than that in the control cells. These results suggested that root growth in L.minor is regulated by endogenous gibberellin.

Keywords: Cell wall extensibility; Cellulose microfibril; Cortical microtubule; Gibberellin; Lemna minor; Root growth

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

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