Shade promotes Phototropism through Phytochrome B-controlled Auxin production

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Phototropism is an asymmetric growth response enabling plants to optimally position their organs. In flowering plants, the phototropin (phot) blue light receptors are essential to detect light gradients. In etiolated seedlings, the phototropic response is enhanced by the red/far-red (R/FR)-sensing p...

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Detalles Bibliográficos
Otros Autores: Goyal, Anupama, Karayekov, Elizabeth, Galvao, Vinicius Costa, Ren, Hong, Casal, Jorge José, Fankhauser, Christian
Formato: Artículo
Lenguaje:Inglés
Materias:
PHOTOTROPISM
SHADE AVOIDANCE
PHOTORECEPTOR CROSSTALK
PHITOTROPIN 1
PHYTOCHROME B
PHYTOCHROME INTERACTING FACTORs
YUCCAS
ARABIDOPSIS THALIANA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2016goyal.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Shade promotes Phototropism through Phytochrome B-controlled Auxin production 
520 |a Phototropism is an asymmetric growth response enabling plants to optimally position their organs. In flowering plants, the phototropin (phot) blue light receptors are essential to detect light gradients. In etiolated seedlings, the phototropic response is enhanced by the red/far-red (R/FR)-sensing phytochromes (phy) with a predominant function of phyA. In this study, we analyzed the influence of the phytochromes on phototropism in green (deetiolated) Arabidopsis seedlings. Our experiments in the laboratory and outdoors revealed that, in open environments (high R/FR ratio), phyB inhibits phototropism. In contrast, under foliar shade, where access to direct sunlight becomes important, the phototropic response was strong. phyB modulates phototropism, depending on the R/FR ratio, by controlling the activity of three basic-helix-loop-helix (bHLH) transcription factors of the PHYTOCHROME INTERACTING FACTORs (PIFs) family. Promotion of phototropism depends on PIF-mediated induction of several members of the YUCCA gene family, leading to auxin production in the cotyledons. Our study identifies PIFs and YUCCAs as novel molecular players promoting phototropism in photoautotrophic, but not etiolated, seedlings. Moreover, our findings reveal fundamental differences in the phytochrome-phototropism crosstalk in etiolated versus green seedlings. We propose that in natural conditions where the light environment is not homogeneous, the uncovered phytochrome-phototropin co-action is important for plants to adapt their growth strategy to optimize photosynthetic light capture. 
653 |a PHOTOTROPISM 
653 |a SHADE AVOIDANCE 
653 |a PHOTORECEPTOR CROSSTALK 
653 |a PHITOTROPIN 1 
653 |a PHYTOCHROME B 
653 |a PHYTOCHROME INTERACTING FACTORs 
653 |a YUCCAS 
653 |a ARABIDOPSIS THALIANA 
700 1 |9 67480  |a Goyal, Anupama  |u University of Lausanne. Faculty of Biology and Medicine. Center for Integrative Genomics. Lausanne, Switzerland. 
700 1 |9 67481  |a Karayekov, Elizabeth  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  
700 1 |a Galvao, Vinicius Costa  |u University of Lausanne. Faculty of Biology and Medicine. Center for Integrative Genomics. Lausanne, Switzerland.  |9 67482 
700 1 |a Ren, Hong  |u Plant Biology Laboratory. Salk Institute for Biological Studies. La Jolla, USA.  |9 67483 
700 1 |9 792  |a Casal, Jorge José  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.   |u CONICET - Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires. Buenos Aires, Argentina. 
700 1 |9 67487  |a Fankhauser, Christian  |u University of Lausanne. Faculty of Biology and Medicine. Center for Integrative Genomics. Lausanne, Switzerland. 
773 |t Current biology  |g Vol.26 (2016), p.3280–3287, grafs. 
856 |f 2016goyal  |i En reservorio  |q application/pdf  |u http://ri.agro.uba.ar/files/intranet/articulo/2016goyal.pdf  |x ARTI201807 
856 |u https://www.cell.com/  |z LINK AL EDITOR 
942 |c ARTICULO 
942 |c ENLINEA 
976 |a AAG 

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