AtBBX21 and COP1 genetically interact in the regulation of shade avoidance
Plants grown at high densities perceive the reduction in the ratio of red [R] to far-red [FR] light as a warning of competition. This light signal triggers morphological responses such as hypocotyl and stem elongation, and acceleration of flowering, which are known collectively as the shade-avoidanc...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Crocco.pdf LINK AL EDITOR |
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| 022 | |a 1365-313X (en línea) | ||
| 022 | |a 0960-7412 (impreso) | ||
| 024 | |a 10.1111/j.1365-313X.2010.04360.x | ||
| 040 | |a AR-BaUFA |c AR-BaUFA | ||
| 245 | 1 | 0 | |a AtBBX21 and COP1 genetically interact in the regulation of shade avoidance |
| 520 | |a Plants grown at high densities perceive the reduction in the ratio of red [R] to far-red [FR] light as a warning of competition. This light signal triggers morphological responses such as hypocotyl and stem elongation, and acceleration of flowering, which are known collectively as the shade-avoidance syndrome [SAS]. Mutations in the photomorphogenic repressor COP1 suppress the SAS, but how COP1 modulates these responses is uncertain. We identified a new mutant with altered responses to natural shade, named lhus [long hypocotyl under shade]. lhus seedlings have longer hypocotyls than wild-type under a low R:FR ratio, but not under sunlight or darkness. The lhus phenotype is due to a mutation affecting a B-box zinc finger transcription factor encoded by At1g75540, a gene previously reported as AtBBX21 that interacts with COP1 to control de-etiolation. Mutations in genes encoding other members of this protein family also result in impaired SAS regulation. Under short-term canopy shade, LHUS/BBX21 acts as positive regulator of SAS genes such as PAR1, HFR1, PIL1 and ATHB2. In contrast, global expression analysis of wild-type and lhus/bbx21 seedlings revealed that a large number of genes involved in hormonal signalling pathways are negatively regulated by LHUS/BBX21 in response to long-term canopy shade, and this observation fits well with the phenotype of lhus/bbx21 seedlings grown under a low R:FR ratio. Moreover, the bbx21 bbx22 double mutation restored the SAS in the cop1 background. We propose that LHUS/BBX21 and other B-box-containing proteins, such as BBX22, act downstream of COP1, and play a central role in early and long-term adjustment of the SAS in natural environments. | ||
| 650 | |2 Agrovoc |9 26 | ||
| 653 | 0 | |a ARABIDOPSIS | |
| 653 | 0 | |a B-BOX ZINC FINGER PROTEINS | |
| 653 | 0 | |a CANOPY LIGHT | |
| 653 | 0 | |a PAR GENES | |
| 653 | 0 | |a SHADE-AVOIDANCE SYNDROME | |
| 653 | 0 | |a T-DNA MUTANTS | |
| 653 | 0 | |a GENES | |
| 653 | 0 | |a SEED | |
| 653 | 0 | |a TRANSCRIPTION FACTORS | |
| 653 | 0 | |a ZINC | |
| 653 | 0 | |a TRANSCRIPTION | |
| 653 | 0 | |a ARABIDOPSIS PROTEIN | |
| 653 | 0 | |a BASIC HELIX LOOP HELIX TRANSCRIPTION FACTOR | |
| 653 | 0 | |a BBX21 PROTEIN, ARABIDOPSIS | |
| 653 | 0 | |a COP1 PROTEIN, ARABIDOPSIS | |
| 653 | 0 | |a PAR1 PROTEIN, ARABIDOPSIS | |
| 653 | 0 | |a TRANSCRIPTION FACTOR | |
| 653 | 0 | |a UBIQUITIN PROTEIN LIGASE | |
| 653 | 0 | |a GENE EXPRESSION PROFILING | |
| 653 | 0 | |a GENE EXPRESSION REGULATION | |
| 653 | 0 | |a GENETICS | |
| 653 | 0 | |a GROWTH, DEVELOPMENT AND AGING | |
| 653 | 0 | |a METABOLISM | |
| 653 | 0 | |a MUTATION | |
| 653 | 0 | |a PHOTOTROPISM | |
| 653 | 0 | |a PLANT GENE | |
| 653 | 0 | |a SUNLIGHT | |
| 653 | 0 | |a UPREGULATION | |
| 653 | 0 | |a ARABIDOPSIS PROTEINS | |
| 653 | 0 | |a BASIC HELIX-LOOP-HELIX TRANSCRIPTION FACTORS | |
| 653 | 0 | |a GENE EXPRESSION REGULATION, PLANT | |
| 653 | 0 | |a GENES, PLANT | |
| 653 | 0 | |a UBIQUITIN-PROTEIN LIGASES | |
| 653 | 0 | |a UP-REGULATION | |
| 700 | 1 | |a Crocco, Carlos Daniel |9 37590 | |
| 700 | 1 | |a Holm, Magnus |9 69361 | |
| 700 | 1 | |a Yanovsky, Marcelo J. |9 11465 | |
| 700 | 1 | |a Botto, Javier Francisco |9 65609 | |
| 773 | |t The Plant Journal |g Vol.64, no.4 (2010), p.551-562 | ||
| 856 | |u http://ri.agro.uba.ar/files/intranet/articulo/2010Crocco.pdf |i En reservorio |q application/pdf |f 2010Crocco |x MIGRADOS2018 | ||
| 856 | |u http://www.wiley.com/ |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 942 | 0 | 0 | |c ARTICULO |
| 942 | 0 | 0 | |c ENLINEA |
| 976 | |a AAG | ||