The cotyledons produce sufficient FT protein to induce flowering: Evidence from cotyledon micrografting in arabidopsis

Seong Jeon Yoo, Sung Myun Hong, Hye Seung Jung, Ji Hoon Ahn

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In Arabidopsis, long-distance movement of FLOWERING LOCUS T (FT) protein from the leaf to the shoot apex triggers flower development. In wild-type Arabidopsis plants under long-day conditions, FT is mainly expressed in the cotyledon but is weakly expressed in the first true leaf prior to floral induction. To test the importance of the cotyledon in floral induction, we developed a cotyledon micrografting (Cot-grafting) method that, unlike other grafting methods, allows the FT protein from the graft to be transported via its native route from leaves to the shoot apex. By using Cot-grafting, we found that grafting a single wild-type cotyledon onto an ft-10 mutant strongly suppressed the ft-10 late flowering phenotype. Neither Y-grafting wild-type shoots nor butt-grafting wild-type roots to ft-10 plants resulted in comparably accelerated flowering in the ft-10 recipient plants. ft-10 mutants grafted with a 35S::FT cotyledon flowered as early as wild-type plants. When phloem-specific tracers were applied to a donor cotyledon, the tracers were detected in the vein of the true leaf of recipient plants 6 d after Cot-grafting. Also, macromolecule trafficking of an FT:yellow fluorescent protein:hemagglutinin fusion occurred across the graft junction 6 d after Cot-grafting. These results suggest that Cot-grafting, which allows protein movement in a manner consistent with the natural flow of FT protein from the leaf to the shoot apex, can efficiently suppress the late flowering of ft-10 mutants. Our results further suggest that in Arabidopsis, the cotyledon is an important organ for producing FT protein to induce flowering.

Original languageEnglish
Pages (from-to)119-128
Number of pages10
JournalPlant and Cell Physiology
Volume54
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Cotyledon
Arabidopsis
cotyledons
flowering
Proteins
proteins
grafting (plants)
shoots
leaves
mutants
tracer techniques
Transplants
Phloem
Plant Leaves
Hemagglutinins
hemagglutinins
plant veins
phloem
Veins
Phenotype

Keywords

  • Cotyledon
  • FLOWERING LOCUS T (FT)
  • Flowering time
  • Long-distance signaling
  • Micrografting

ASJC Scopus subject areas

  • Plant Science
  • Physiology
  • Cell Biology

Cite this

The cotyledons produce sufficient FT protein to induce flowering : Evidence from cotyledon micrografting in arabidopsis. / Yoo, Seong Jeon; Hong, Sung Myun; Jung, Hye Seung; Ahn, Ji Hoon.

In: Plant and Cell Physiology, Vol. 54, No. 1, 01.01.2013, p. 119-128.

Research output: Contribution to journalArticle

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abstract = "In Arabidopsis, long-distance movement of FLOWERING LOCUS T (FT) protein from the leaf to the shoot apex triggers flower development. In wild-type Arabidopsis plants under long-day conditions, FT is mainly expressed in the cotyledon but is weakly expressed in the first true leaf prior to floral induction. To test the importance of the cotyledon in floral induction, we developed a cotyledon micrografting (Cot-grafting) method that, unlike other grafting methods, allows the FT protein from the graft to be transported via its native route from leaves to the shoot apex. By using Cot-grafting, we found that grafting a single wild-type cotyledon onto an ft-10 mutant strongly suppressed the ft-10 late flowering phenotype. Neither Y-grafting wild-type shoots nor butt-grafting wild-type roots to ft-10 plants resulted in comparably accelerated flowering in the ft-10 recipient plants. ft-10 mutants grafted with a 35S::FT cotyledon flowered as early as wild-type plants. When phloem-specific tracers were applied to a donor cotyledon, the tracers were detected in the vein of the true leaf of recipient plants 6 d after Cot-grafting. Also, macromolecule trafficking of an FT:yellow fluorescent protein:hemagglutinin fusion occurred across the graft junction 6 d after Cot-grafting. These results suggest that Cot-grafting, which allows protein movement in a manner consistent with the natural flow of FT protein from the leaf to the shoot apex, can efficiently suppress the late flowering of ft-10 mutants. Our results further suggest that in Arabidopsis, the cotyledon is an important organ for producing FT protein to induce flowering.",
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