Journal Article

Suppression of Tiller Bud Activity in Tillering Dwarf Mutants of Rice

Shinji Ishikawa, Masahiko Maekawa, Tomotsugu Arite, Kazumitsu Onishi, Itsuro Takamure and Junko Kyozuka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 1, pages 79-86
Published in print January 2005 | ISSN: 0032-0781
Published online January 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci022
Suppression of Tiller Bud Activity in Tillering Dwarf Mutants of Rice

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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In this study, we analyzed five tillering dwarf mutants that exhibit reduction of plant stature and an increase in tiller numbers. We show that, in the mutants, axillary meristems are normally established but the suppression of tiller bud activity is weakened. The phenotypes of tillering dwarf mutants suggest that they play roles in the control of tiller bud dormancy to suppress bud activity. However, tillering dwarf mutants show the dependence of both node position and planting density on their growth, which implies that the functions of tillering dwarf genes are independent of the developmental and environmental control of bud activity. Map-based cloning of the D3 gene revealed that it encodes an F-box leucine-trich repeat (LRR) protein orthologous to Arabidopsis MAX2/ORE9. This indicates the conservation of mechanisms controlling axillary bud activity between monocots and eudicots. We suggest that tillering dwarf mutants are suitable for the study of bud activity control in rice and believe that future molecular and genetic studies using them may enable significant progress in understanding the control of tillering and shoot branching.

Keywords: Keywords: Axillary meristem — Bud activity — Bud dormancy — Rice — Tiller.; Abbreviations: LLR, leucine-rich region; RT–PCR, reverse transcriptase–polymerase cahin reaction; SAM, shoot apical meristem.

Journal Article.  5240 words.  Illustrated.

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

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