AE-Bio Department of Agricultural and Environmental Biology close



Lab. Crop Ecology and Morphology
Dept. Agriculture and Environmental Biology

Associate Professor


1. University of Tokyo (MS)
2. University of Tokyo (Ph.D.)

Main Research
Molecular and Genetic Mechanisms Controlling Rice Panicle Development

In plants, organogenesis occurs throughout their lifetime. During the post-embryonic development, plants initiate a multitude of growth axes by forming new meristems which give rise to branch shoots and flowers. Therefore, the pattern of new meristem formation and the establishment of their identities are major determinants of plant form.
During the rice panicle development, new meristems sequentially initiate and they acquire their identities according to the genetically defined program. To understand molecular mechanisms controlling the rice panicle development, we are studying two genes, LAX PANCILE (LAX) and FRIZZY PANICLE (FZP), which are involved in the new meristem initiation and the determination of their identities, respectively. We have isolated LAX and FZP genes and showed that they encode transcription factors. Currently, molecular genetic and biochemical analysis of their functions are in progress.

Recent publications
  1. Arite T, Iwata H, Ohshima K, Maekawa M, Nakajima N, Kojima K, Sakakibara S, and Kyozuka J. DWARF 10, an RMS1/MAX4/DAD1 ortholog, controls lateral bud outgrowth in rice. Plant J. (2007 in press)
  2. Morita Y and Kyozuka J. (2007) Characterization of OsPID, the rice ortholog of PINOID, and its possible involvement in the control of polar auxin transport. Plant Cell Physiol. 48: 540-549.
  3. Kurakawa T, Ueda N, Maekawa M, Kobayashi K, Kojima M, Nagato Y, Sakakibara H and Kyozuka J. (2007) Direct control of shoot meristem activity by a cytokinin activating enzyme. Nature 455: 652-655.
  4. Furutani I, Sukegawa S and Kyozuka J. (2006) Genome-wide analysis of spatial and temporal gene expression in rice panicle development. Plant J. 46: 503-511.
  5. Ishikawa S, Maekawa M, Arite T, Ohnishi K, Takamure I and Kyozuka J. (2005) Suppression of tiller bud activity in tillering dwarf mutants of rice. Plant Cell Physiol. 46: 79-86.
  6. Gallavotti A, Zhau Q, Kyozuka J, Meeley R, Ritter MK, Doebley JF, Pe ME and Schmidt RJ. (2004) The role of barren stalk 1 in the architecture of maize. Nature 432: 630-635.
  7. Chujo Y, Chu Z, Kishino H, Shimamoto K and Kyozuka J. (2003) Partial conservation of LFY function between rice and Arabidopsis. Plant Cell Physiol. 44: 1311-1319.
  8. Komatsu,K, Maekawa M, Ujiie S, Satake Y, Okamoto H, Furutani I, Shimamoto K and Kyozuka J. (2003) LAX and SPA - major regulators of shoot branching in rice. Proc. Natl. Acad. Sci. USA 100: 11765-11770.
  9. Komatsu M, Chujo A, Shimamoto K and Kyozuka J. (2003) FRIZZY PANICLE is required to prevent the formation of axillary meristems and to establish floral meristem identity in rice spikelets. Development 130:3841-3850.
  10. Komatsu M, Shimamoto K, Kyozuka J. (2003) Two-step regulation and continuous transposition of the LINE-type retrotransposon Karma. Plant Cell 15:1934-1944.
  11. Shimamoto K, Kyozuka J. (2002). Rice as a model of comparative genomics of plants. Annual Review of Plant Physiology and Plant Molecular Biology 53: 399-419.
  12. Nakagawa M, Shimamoto K, and Kyozuka J. (2002). Over-expression of RCN1 and RCN2, rice TERMINAL FLOWER 1/CENTRORADIALIS homologs confers the delay of phase transition and altered panicle morphology in rice. Plant J. 29: 743-750.
  13. Kyozuka J, and Shimamoto K. (2002). Ectopic expression of OsMADS3, a rice ortholog of AGAMOUS, caused a homeotic transformation of lodicules to stamens in transgenic rice plants. Plant Cell Physiol.43: 130-135.
  14. Komatsu M, Maekawa M, Shimamoto and K, Kyozuka J. (2001). LAX1 and FRIZZY PANICLE 2 genes determine the inflorescence architecture of rice by controlling rachis-branch and spikelet development. Devel. Biol. 231: 364-373.
  15. Goto K, Kyozuka J, Bowman JL. (2001). Floral patterning: Are flowers and leaves convertible organs? Current Opinion of Genetics and Development 11: 449-456.
  16. Kyozuka J, Kobayashi T, Morita M, and Shimamoto K. (2000). Spatially and temporally regulated expression of rice MADS box genes with similarity to Arabidopsis class A, B, C genes. Plant Cell Physiol. 41: 710-718.


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