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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci022
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights researved.
Received October 29, 2004
Accepted November 11, 2004

Rapid Paper

Suppression of Tiller Bud Activity in Tillering Dwarf Mutants of Rice

Shinji Ishikawa 1, Masahiko Maekawa 2, Tomotsugu Arite 3, Kazumitsu Onishi 4, Itsuro Takamure 4, and Junko Kyozuka 1*

1 Graduate School of Agriculture and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan; CREST, Japan Science and Technology Corporation, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
2 Research Institute for Bioresources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046, Japan
3 Graduate School of Agriculture and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
4 Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan


  Abstract

In this study we analyzed five tillering dwarf mutants that exhibit the reduction of plant stature and increase of tiller numbers. We show that axillary meristems are normally established but the suppression of tiller bud activity is weakened in the mutants. 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 node-position and planting density dependence of their growth implies that the functions of tillering dwarf genes are independent of developmental and environmental control of bud activity. Map-based cloning of D3 gene revealed that it encodes an F-box 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 future molecular and genetic studies with them may enable significant progress in understanding the control of tillering, and to shoot branching.

Keywords: axillary meristem; bud dormancy; bud activity; tiller; rice.
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