Phytochrome A increases tolerance to high evaporative demand

Stresses resulting from high transpiration demand induce adjustments in plants that lead to reductions of water loss. These adjustments, including changes in water absorption, transport and/or loss by transpiration, are crucial to normal plant development. Tomato wild type [WT] and phytochrome A [ph...

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Detalles Bibliográficos
Otros Autores: Auge, Gabriela Alejandra, Rugnone, Matías Leandro, Cortés, Leandro Emanuel, González, Carina Verónica, Zarlavsky, Gabriela Elena, Boccalandro, Hernán Esteban, Sánchez, Rodolfo Augusto
Formato: Artículo
Lenguaje:Inglés
Materias:
PHYTOCHROME A
WATER
ACCLIMATIZATION
COMPARATIVE STUDY
EVAPOTRANSPIRATION
GENETIC VARIABILITY
GENETICS
GENOTYPE
GROWTH, DEVELOPMENT AND AGING
METABOLISM
PHYSIOLOGICAL STRESS
PHYSIOLOGY
PLANT LEAF
PLANT ROOT
PLANT STEM
PLANT STOMA
SPECIES DIFFERENCE
SUNLIGHT
TOMATO
TRANSPORT AT THE CELLULAR LEVEL
XYLEM
BIOLOGICAL TRANSPORT
GENETIC VARIATION
PLANT LEAVES
PLANT ROOTS
PLANT STEMS
PLANT STOMATA
PLANT TRANSPIRATION
SPECIES SPECIFICITY
STRESS, PHYSIOLOGICAL
LYCOPERSICON ESCULENTUM
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Auge.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 Stresses resulting from high transpiration demand induce adjustments in plants that lead to reductions of water loss. These adjustments, including changes in water absorption, transport and/or loss by transpiration, are crucial to normal plant development. Tomato wild type [WT] and phytochrome A [phyA]-mutant plants, fri1-1, were exposed to conditions of either low or high transpiration demand and several morphological and physiological changes were measured during stress conditions. Mutant plants rapidly wilted compared to WT plants after exposure to high evaporative demand. Root size and hydraulic conductivity did not show significant differences between genotypes, suggesting that water absorption and transport through this organ could not explain the observed phenotype. Moreover, stomatal density was similar between genotypes, whereas transpiration and stomatal conductance were both lower in mutant than in WT plants. This was accompanied by a lower stem-specific hydraulic conductivity in mutant plants, which was associated to lower xylem vessel number and transversal area in fri1-1 plants, producing a reduction in water supply to the leaves, which rapidly wilted under high evaporative demand. PhyA signaling might facilitate the adjustment to environments differing widely in water evaporative demand in part through the modulation of xylem dimensions. 
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700 1 |9 68568  |a Auge, Gabriela Alejandra 
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700 1 |9 67603  |a Boccalandro, Hernán Esteban 
700 1 |a Sánchez, Rodolfo Augusto  |9 49417 
773 |t Physiologia Plantarum  |g vol.146, no.2 (2012), p.228-235 
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900 |a ^aGonzález^bC.V.^tLab. de Anatomia Vegetal Cátedra de Botánica Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina 
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