Phytochrome B increases drought tolerance by enhancing ABA sensitivity in Arabidopsis thaliana

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Phytochrome B [phyB] can adjust morphological and physiological responses according to changes in the red:far-red [R:FR] ratio. phyB-driven acclimation of plants to open environments [high R:FR ratio] increases carbon gain at the expense of increased water loss. This behaviour alleviates stressful c...

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Detalles Bibliográficos
Otros Autores: González, Carina Verónica, Ibarra, Silvia Elizabeth, Piccoli, Patricia Noemí, Botto, Javier Francisco, Boccalandro, Hernán Esteban
Formato: Artículo
Lenguaje:Inglés
Materias:
ABA SIGNALING ELEMENTS
R:FR RATIO
WATER SHORTAGE
ABSCISIC ACID
ARABIDOPSIS PROTEIN
PHYB PROTEIN, ARABIDOPSIS
PHYTOCHROME B
WATER
DESICCATION
DICOTYLEDON
DROUGHT STRESS
MORPHOLOGY
PHYTOCHEMISTRY
SIGNAL
SOIL WATER
WATER AVAILABILITY
BIOLOGICAL MODEL
DRUG EFFECT
GENETICS
METABOLISM
PHYSIOLOGICAL STRESS
PHYSIOLOGY
PLANT STOMA
SIGNAL TRANSDUCTION
ARABIDOPSIS PROTEINS
MODELS, BIOLOGICAL
PLANT STOMATA
STRESS, PHYSIOLOGICAL
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Gonzalez.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Phytochrome B [phyB] can adjust morphological and physiological responses according to changes in the red:far-red [R:FR] ratio. phyB-driven acclimation of plants to open environments [high R:FR ratio] increases carbon gain at the expense of increased water loss. This behaviour alleviates stressful conditions generated by an excess of light, but increases the chances of desiccation. Here we evaluated how phyB modulates this drought-tolerance response by comparing wild-type Arabidopsis thaliana adult plants to the null phyB in response to water shortage. phyB wilted before the wild type, and this was due to phyB maintaining open stomata under a reduction in soil water availability. Although phyB presented enhanced ABA levels under well-watered conditions, this mutant was less sensitive than the wild type in diminishing stomatal conductance in response to exogenous ABA application. Reduced sensitivity to ABA in phyB correlated with a lower expression of ABCG22, which encodes a putative ABA influx transporter, and PYL5, which encodes a soluble ABA receptor. Furthermore, the expression of RAB18 and RD29A, both typical ABA-induced genes, was lower in phyB than the wild type after ABA treatment. We propose that phyB contributes to the acclimation of plants to open environments by enhancing ABA sensitivity when soil water becomes limiting. 
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