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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Xiao, Ke Holtgräwe, Daniela Dally, Nadine Jung, Christian |
| Description | Author Affiliation: Dally N ( Plant Breeding Institute, Kiel University, D-24108 Kiel, Germany); Xiao K ( Plant Breeding Institute, Kiel University, D-24108 Kiel, Germany); Holtgräwe D ( CeBiTec and Department of Biology, Bielefeld University, D-33594 Bielefeld, Germany.); Jung C ( Plant Breeding Institute, Kiel University, D-24108 Kiel, Germany); |
| Abstract | Sugar beet (Beta vulgaris) is a biennial root crop that grows vegetatively in the first year and starts shoot elongation (bolting) and flowering after exposure to cold temperatures over winter. Early bolting before winter is controlled by the dominant allele of the B locus. Recently, the BOLTING TIME CONTROL 1 (BTC1) gene has been cloned from this locus. BTC1 promotes early bolting through repression of the downstream bolting repressor B. vulgaris FLOWERING LOCUS T1 (BvFT1) and activation of the downstream floral activator BvFT2. We have identified a new bolting locus B2 acting epistatically to B. B2 houses a transcription factor which is diurnally regulated and acts like BTC1 upstream of BvFT1 and BvFT2. It was termed BvBBX19 according to its closest homolog from Arabidopsis thaliana. The encoded protein has two conserved domains with homology to zinc finger B-boxes. Ethyl methanesulfonate-induced mutations within the second B-box caused up-regulation of BvFT1 and complete down-regulation of BvFT2. In Arabidopsis, the expression of FT is promoted by the B-box containing protein CONSTANS (CO). We performed a phylogenetic analysis with B-box genes from beet and A. thaliana but only BvCOL1 clustered with CO. However, BvCOL1 had been excluded as a CO ortholog by previous studies. Therefore, a new model for flowering induction in beet is proposed in which BTC1 and BvBBX19 complement each other and thus acquire a CO function to regulate their downstream targets BvFT1 and BvFT2. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 28 |
| Volume Number | 111 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2014-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Beta Vulgaris Genetics Genetic Loci Physiology Phylogeny Plant Proteins Transcription Factors Zinc Fingers Arabidopsis Metabolism Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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