Mechanical Stress and Gibberellin : Regulation of Hollowing Induction in the Stem of a Bean Plant, Phaseolus vulgaris L. : GROWTH AND DEVELOPMENT : ENVIRONMENTAL AND STRESS RESPONSES

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概要

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• In pole bean plants, mechanical stress (MS) inhibited stem elongation and induced radial thickening of the stem. Application of uniconazole, an inhibitor of gibberellin biosynthesis, also reduced stem growth but had no effect on stem diameter. Both MS and uniconazole significantly reduced hollowing of the first internodes, but only the former increased ethylene evolution from the first internode. Application of GA_3 increased the length of the first internode and decreased its diameter in bush bean plants; this was accompanied by a significant promotion of stem hollowing. Aminooxyacetic acid (AOA) decreased ethylene evolution from the GA_3-treated internodes, though it did not reduce the GA_3-induced hollowing of the first internodes. Application of GA_3 affected neither ethylene evolution nor cellulase activity in the first internodes of bush bean plants. Application of GA_3 Stimulated much greater cell elongation in the center of pith tissue than in the outer surrounding tissues, suggesting a possible physical breakage of the inner cells, which leads the hollowing of bean stems. These results suggest that gibberellin is a factor responsible for stem hollowing in bean plants. Because MS is known to reduce gibberellin content in bean plants [Suge (1978) Plant Cell Physiol. 21: 303] MS may inhibit stem hollowing by reducing the amount of endogenous gibberellin.

• 日本植物生理学会の論文

著者

• Takahashi Hideyuki

  Graduate School Of Life Sciences Tohoku University

• TAKAHASHI Hideyuki

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• TAKANO Mamoru

  Institute of Genetic Ecology, Tohoku Universtiy

• Suge Hiroshi

  Graduate School of Life Sciences, Tohoku University

• Suge H

  Graduate School Of Life Sciences Tohoku University

• Suge Hiroshi

  Institute For Agricultural Research Tohoku University

• Murata Takao

  Department Of Applied Physiology National Institute Of Agrobiological Resources

• Takahashi Hideyuki

  Institute For Agricultural Research Tohoku University

• Takahashi Hirokazu

  Laboratory Of Plant Molecular Genetics Graduate School Of Agricultural And Life Sciences The Univers

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