Journal Article

The <i>FLOWERING LOCUS T</i>/<i>TERMINAL FLOWER 1</i> Family in Lombardy Poplar

Tomohiro Igasaki, Yumiko Watanabe, Mitsuru Nishiguchi and Nobuhiro Kotoda

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 3, pages 291-300
Published in print March 2008 | ISSN: 0032-0781
Published online March 2008 | e-ISSN: 1471-9053 | DOI:

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


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Genes in the FLOWERING LOCUS T (FT) and TERMINAL FLOWER 1 (TFL1) family have been shown to be important in the control of the switch between vegetative and reproductive growth in several plant species. We isolated nine members of the FT/TFL1 family from Lombardy poplar (Populus nigra var. italica Koehne). Sequence analysis of the members of the FT/TFL1 family revealed considerable homology within their coding regions both among family members and to the members of the same family in Arabidopsis, tomato and grapevine. Moreover, members of this family in all four species examined display a common exon–intron organization. Phylogenetic analysis revealed that the genes fall into four different clades: two into the TFL1 clade; five into the FT clade; and one each into the MOTHER OF FT AND TFL1 and BROTHER OF FT AND TFL1 clades. One gene in the TFL1 clade, PnTFL1, is expressed in vegetative meristems, and transgenic Arabidopsis that ectopically expressed PnTFL1 had a late-flowering phenotype. The expression patterns of two genes in the FT clade, PnFT1 and PnFT2, suggested a role for them in the promotion of flowering, and transgenic Arabidopsis that ectopically expressed either PnFT1 or PnFT2 had an early-flowering phenotype.

Keywords: Flowering control; FLOWERING LOCUS T (FT); Poplar; Populus nigra; TERMINAL FLOWER 1 (TFL1)

Journal Article.  5894 words.  Illustrated.

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

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