Journal Article

Revisiting Phase Transition during Flowering in <i>Arabidopsis</i>

Sung-Suk Suh, Kyu-Ri Choi and Ilha Lee

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 8, pages 836-843
Published in print August 2003 | ISSN: 0032-0781
Published online August 2003 | e-ISSN: 1471-9053 | DOI:
Revisiting Phase Transition during Flowering in Arabidopsis

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


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Single-phase transition during flowering has been suggested by Hempel and Feldman (1994) [Planta 192: 276]. When early flowering ecotypes of Arabidopsis were microscopically observed, a long day signal simultaneously induced the acropetal (bottom to top) production of flower primordia and the basipetal (top to bottom) differentiation of paraclades (axillary flowering shoots) from the axils of pre-existing leaf primordia. However, this model could not account for the production of an extra number of secondary shoots in the TERMINAL FLOWER 1 overexpressor line or AGL20 overexpressor line in Columbia background with a functional allele of FRIGIDA. We report here that Columbia with a functional allele of FRIGIDA under long days and Columbia under short days show an inflorescence-producing phase between the vegetative and the flower-producing phases, supporting two-step phase transition during flowering. In addition, a late-flowering mutant, fwa shows an inflorescence phase but fca, fy and fve follow a single-phase transition, suggesting flowering time mutations have different effects on phase transition during flowering.

Keywords: Keywords: Flowering — Inflorescence phase — Paraclade differentiation — Phase transition.; Abbreviations: F phase, flower-producing phase; I phase, inflorescence phase; V phase, vegetative phase.

Journal Article.  5311 words.  Illustrated.

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

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