Planta

, 228:929 | Cite as

Two FLOWERING LOCUS T (FT) homologs in Chenopodium rubrum differ in expression patterns

  • David Cháb
  • Jan Kolář
  • Matthew S. Olson
  • Helena Štorchová
Original Article

Abstract

FLOWERING LOCUS T (FT) like genes are crucial regulators (both positive and negative) of flowering in angiosperms. We identified two FT homologs in Chenopodium rubrum, a short-day species used as a model plant for the studies of photoperiodic flower induction. We found that CrFTL1 gene was highly inducible by a 12-h dark period, which in turn induced flowering. On the other hand, photoperiodic treatments that did not induce flowering (short dark periods, or a permissive darkness interrupted by a night break) caused only a slight increase in CrFTL1 mRNA level. We demonstrated diurnal oscillation of CrFTL1 expression with peaks in the middle of a light period. The oscillation persisted under constant darkness. Unlike FT homologs in rice and Pharbitis, the CrFTL1 expression under constant darkness was very low. The CrFTL2 gene showed constitutive expression. We suggest that the CrFTL1 gene may play a role as a floral regulator, but the function of CrFTL2 remains unknown.

Keywords

Chenopodium FLOWERING LOCUS T homologs Flower induction Gene expression Night break 

Abbreviations

AP1

APETALA1

ATC

Arabidopsis thaliana CENTRORADIALIS homolog

BFT

BROTHER OF FT AND TFL1

CEN

CENTRORADIALIS

CrFL

FLORICAULA/LEAFY

FT

FLOWERING LOCUS T

FTL

FLOWERING LOCUS T- like

Hd1

Heading date 1

Hd3a

Heading date 3a

MFT

MOTHER OF FT AND TFL1

SP

SELF PRUNING

TFL

TERMINAL FLOWER

TSF

TWIN SISTER OF FT

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • David Cháb
    • 1
  • Jan Kolář
    • 1
  • Matthew S. Olson
    • 2
    • 3
  • Helena Štorchová
    • 1
    • 3
  1. 1.Institute of Experimental Botany v.v.iAcademy of Sciences of the Czech RepublicPrague 6Czech Republic
  2. 2.Department of Biology and WildlifeUniversity of Alaska at FairbanksFairbanksUSA
  3. 3.Institute of Arctic BiologyUniversity of Alaska at FairbanksFairbanksUSA

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