Plant Molecular Biology

, Volume 56, Issue 6, pp 839–848 | Cite as

Characterization of fructose-bisphosphate aldolase regulated by gibberellin in roots of rice seedling

  • Hirosato Konishi
  • Hisakazu Yamane
  • Masayoshi Maeshima
  • Setsuko Komatsu
Article

Abstract

Fructose-bisphosphate aldolase is a glycolytic enzyme whose activity increases in rice roots treated with gibberellin (GA). To investigate the relationship between aldolase and root growth, GA-induced root aldolase was characterized. GA3 promoted an increase in aldolase accumulation when 0.1 μ M GA3 was added exogenously to rice roots. Aldolase accumulated abundantly in roots, especially in the apical region. To examine the effect of aldolase function on root growth, transgenic rice plants expressing antisense aldolase were constructed. Root growth of aldolase-antisense transgenic rice was repressed compared with that of the vector control transgenic rice. Although aldolase activity increased by 25% in vector control rice roots treated with 0.1 μ M GA3, FBPA activity increased very little by 0.1 μ M GA3 treatment in the root of aldolase-antisense transgenic rice. Furthermore, aldolase co-immunoprecipitated with antibodies against vacuolar H+-ATPase in rice roots. In the root of OsCDPK13-antisense transgenic rice, aldolase did not accumulate even after treatment with GA3. These results suggest that the activation of glycolytic pathway function accelerates root growth and that GA3-induced root aldolase may be modulated through OsCDPK13. Aldolase physically associates with vacuolar H-ATPase in roots and may regulate the vacuolar H-ATPase mediated control of cell elongation that determines root length.

Keywords

fructose-bisphosphate aldolase gibberellin glycolytic pathway rice root growth 

Abbreviations

CBB

Comassie brilliant blue

CDPK

Ca2+-dependent protein kinase

GA

gibberellin

V-ATPase

vacuolar H2+-ATPase

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Copyright information

© Springer 2005

Authors and Affiliations

  • Hirosato Konishi
    • 1
  • Hisakazu Yamane
    • 2
  • Masayoshi Maeshima
    • 3
  • Setsuko Komatsu
    • 1
  1. 1.Department of Molecular GeneticsNational Institute of Agrobiological SciencesTsukubaJapan
  2. 2.Biotechnology Research CenterThe University of TokyoBunkyo-kuJapan
  3. 3.Laboratory of Cell Dynamics, Graduate School of Bioagricultural SciencesNagoya UniversityNagoyaJapan

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