Redei, G.P. () Supervital mutants of Arabidopsis. Genetics, 47 Simpson, G.G. &Dean, C. () Arabidopsis, the Rosetta stone of flowering time?Science . casein protein kinase 2 alphasubunit genes. Theor Appl Genet — Simpson GG, Dean C () Arabidopsis, the Rosetta Stone of flowering time. [CrossRef] [PubMed] Simpson, G.G.; Dean, C. Arabidopsis, the Rosetta stone of flowering time? Science , , – [CrossRef] [PubMed] Valentin, F.L. .

Author: Makasa Grotaur
Country: Cyprus
Language: English (Spanish)
Genre: Education
Published (Last): 21 January 2006
Pages: 30
PDF File Size: 14.87 Mb
ePub File Size: 4.13 Mb
ISBN: 934-1-58892-711-8
Downloads: 44781
Price: Free* [*Free Regsitration Required]
Uploader: Kazikazahn

C, D Two-month-old tfl;ft-1 C and ft-1 D plants. Plant Cell 9, Days are relative to sowing, which is designated as day 0.

Epigenetic Regulation in the Control of Flowering

Many organisms use day length photoperiod information to prepare for seasonal changes []. Regulation of FTthrough activation by CO and repression by TFL2would provide a good model with which to reveal these molecular mechanisms.

GUS plants, indicating CO is expressed in vascular tissues. Phytohormones and age, two internal cues, also induce flowering. A proposed model for the flowering signaling pathway of sugarcane under photoperiodic control.

This was coincident with the reduction in the number of days taken to form visible flower buds between tfl2 and wild type Larsson et al. We report here that FT is upregulated in the tfl2 mutant, whereas CO and other floral pathway integrators are not affected. GUS was expressed in the petiole and petiole side of leaf blade, where cells were proliferating, but this expression disappeared in the mature leaves and GUS staining remained in the vascular tissue Fig.

Plant Cell 17, References Publications referenced by this paper. This drastic difference in developmental patterns enables us to assess the effects of genetic modification on the photoperiodic response more precisely.


The other is activating the stlne key regulator that peaks in late afternoon. In plants, mutants of chromatin factors show pleiotropic phenotypes, whereas in animals defects in these homologous genes are lethal Wagner Homeotic changes of flower, however, are not observed in tfl2 mutants.

View large Download slide. Anim Sci J 81, Histone methyltransferase activity of a Drosophila Polycomb group repressor complex.

We constructed the g TFL2: By microarray analysis, however, we did not detect an upregulation of heterochromatin genes in the tfl2 mutant. In transgenic Arabidopsis carrying a TFL2: Trends Plant Sci 11, The pleiotropic phenotypes of tfl2 mutants suggest that TFL2 function is required for timd regulation of multiple genes, and indeed we found that several floral homeotic genes are upregulated in the tfl2 mutant.

Arabidoppsis and conserved amino residues are indicated by bold and light shadows, respectively. Open and filled bars represent light and dark periods, respectively.

We first focused on the flowerin phenotype of tfl2which is relatively insensitive to day length, because this phenotype suggests that TFL2 gene may function to repress target gene s involved in the photoperiod pathway. Photoperiodic response was first described in plants in the early twentieth century [6].

A day-old plant Eroot apical meristem F and emerging lateral roots G are shown. Nat Rev Mol Cell Biol 4, The expression profile of the tfl2;ft double mutant plant was also examined to discriminate genes that were induced by the misexpression of FT or by the early progression of flowering as a result of FT misexpression.

Caroline Dean – Google Scholar Citations

These observations show that even a small misexpression of FT is sufficient for floral induction, and thus FT must be strictly maintained in a silent state during the non-inductive phase. Photochem Photobiol 9, Plant Cell 14 Suppl, S A From left to right, day-old tfltfl;ft-1ft-1 and WT Col plants. Plant Cell 15, Plant Cell 11, Each PCR assay was done twice.


Nat Genet 33, Annu Rev Genet 37, A thermosensory pathway controlling flowering time in Arabidopsis thaliana. Flowering pathways in the model plant Arabidopsis.

Schemske The New phytologist Invert Neurosci 3, In order to investigate which gene in the photoperiod pathway is affected by TFL2 function, we compared the expression of COFT and SOC1 between the tfl2 mutant and the wild type background.

The roots of transgenic Arabidopsis carrying TFL2: TFL2 gene is a unique gene in the Arabidopsis genome that encodes a protein with extensive homology to HP1.

Epigenetic Regulation in the Control of Flowering

We used the aerial tim of seedlings without leaves leaves were cut off at petioles or rosette leaves. EMBO J 27, The points of the pathways are fliwering. By clicking accept or continuing to use the site, you agree to the terms outlined in our Privacy PolicyTerms of Serviceand Dataset License. The abundance of both CO and FT transcripts in the wild type is very low, which suggests that a small amount of their misexpression is sufficient for floral induction Putterill et al.

Author: admin