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. .

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Flowering pathways in the model plant Arabidopsis Various environmental factors influence the transition from vegetative to reproductive growth flowering. Recent studies have shown that euchromatic genes are also silenced through HP1 Firestein et al. Photochem Photobiol 9, Close mobile search navigation Article navigation. We mapped the insertion point of tfl close to the TFL2 locus, near the simple sequence length polymorphism marker nga on chromosome 5 Larsson et al.

stond Nat Rev Genet 13, With the genetic results showing that the early-flowering phenotype of tfl2 is suppressed by an ft mutation, we can conclude that TFL2 specifically represses FT in the flowering pathway. Embo J 21, The expression of both FKF1 and GI proteins occurs in the afternoon and is regulated by core clock proteins [].

KaplerMark A. Based on our findings as well as others, a detailed model for day-length sensing mechanisms in Arabidopsis has been constituted see details below. B Top view of day-old tfl;ft-1 left and ft-1 right plants. B—C Confocal microscopy images of root meristem cells of transgenic Arabidopsis carrying 35S:: Because the tfl2 mutation is not lethal even in the null allele tflunlike in Drosophilawhich also has single HP1 gene, tfl2 mutants will provide a good system in which to investigate the function of HP1-like proteins.


TFL2 represents such a protein, and these findings suggest that early-flowering mutants provide a good tool with which to identify repressors that are important in the flowering pathway. Chronobiol Int 20, Expression of floral homeotic genes in wild type, tfl2and tfl2;ft.

A yeast strain carrying an swi6- mutation Allshire et al. Currently, molecular genetic evidence in plants and animals [] most supports the external coincidence model proposed by Collin Pittendriph in [14].

Arabidopsis, the Rosetta stone of flowering time?

Curr Biol 17, Many plants respond to environmental cues, such as day-length and temperature, to regulate flowering time. 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.

Of the flowering-associated genes contained on the GeneChip, only the expression of FT was increased in tfl2consistent with our previous findings.

In addition, studying the photoperiodic flowering mechanism is important for understanding a major plant reproduction mechanism, one that is directly applicable to improvement in crop yields. We also measured arabbidopsis expression level of Rowetta. GUS gene was introduced into tfl plants, which resulted in complementation of the mutant phenotype in these transgenic plants.

Oda for technical advice, and to N. In this model, light plays two crucial roles. Trends Plant Sci 11, The day-length-insensitive early-flowering phenotype of tfl2 is due to ectopic expression of FT at an early developmental stage.

Arabidopsis, the Rosetta stone of flowering time? National Institute of General Medical Sciences. Related articles in Web of Science Google Scholar.

It flowers early under long-day LD conditions, while flowering is delayed in short days SD. For wild type, error bars lie within circles.

Days are relative to sowing, which is designated as day 0. The ED-rich region hatched linechromo domain box raabidopsis chromo shadow domain solid line are indicated.


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A current mechanistic model for day-length measurement in Arabidopsis. Crosses with tfl obtained from the Arabidopsis Biological Resource Center showed that tfl is allelic to tfl Larsson et al. Recent studies have revealed that some cloned genes whose mutants cause early flowering encode proteins with homology to arabidopxis group proteins or chromatin remodeling factors Blazquez et al.

Histone methyltransferase activity of a Drosophila Polycomb group repressor complex. A proposed model for the flowering signaling pathway of sugarcane under photoperiodic control. Plant Cell 20, The other is activating the floweirng key regulator that peaks in late afternoon.

Thus, the relationship between presence of light and phase of circadian clock components is important for sensing day-length changes. GUS was expressed in the petiole and petiole side of leaf blade, where cells were proliferating, but risetta expression disappeared in the mature leaves and GUS staining remained in the vascular tissue Fig.

Caroline Dean – Google Scholar Citations

Mol Cell Endocrinol In transgenic Arabidopsis carrying a TFL2: Plant Cell 14 Suppl, S Many organisms use day length ston information to prepare for seasonal changes []. A genetic and physiological analysis of late flowering mutants in Arabidopsis thaliana. AukermanHajime Sakai The Plant cell In parentheses, fold activations against Col are indicated.

Arabidopsis is an ideal system for the study of seasonal flowering mechanisms Many organisms use day length photoperiod information to prepare for seasonal changes [].