Artículo
Phytochrome B enhances photosynthesis at the expense of water-use efficiency in Arabidopsis
Boccalandro, Hernan Esteban
; Rugnone, Matias Leandro
; Moreno, Javier Edgardo
; Ploschuk, Edmundo Leonardo; Serna, Laura; Yanovsky, Marcelo Javier
; Casal, Jorge José
Fecha de publicación:
04/2009
Editorial:
American Society of Plant Biologist
Revista:
Plant Physiology
ISSN:
0032-0889
e-ISSN:
1532-2548
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In open places, plants are exposed to higher fluence rates of photosynthetically active radiation and to higher red to far-red ratios than under the shade of neighbor plants. High fluence rates are known to increase stomata density. Here we show that high, compared to low, red to far-red ratios also increase stomata density in Arabidopsis (Arabidopsis thaliana). High red to far-red ratios increase the proportion of phytochrome B (phyB) in its active form and the phyB mutant exhibited a constitutively low stomata density. phyB increased the stomata index (the ratio between stomata and epidermal cells number) and the level of anphistomy (by increasing stomata density more intensively in the adaxial than in the abaxial face). phyB promoted the expression of FAMA and TOO MANY MOUTHS genes involved in the regulation of stomata development in young leaves. Increased stomata density resulted in increased transpiration per unit leaf area. However, phyB promoted photosynthesis rates only at high fluence rates of photosynthetically active radiation. In accordance to these observations, phyB reduced long-term water-use efficiency estimated by the analysis of isotopic discrimination against (13)CO(2). We propose a model where active phyB promotes stomata differentiation in open places, allowing plants to take advantage of the higher irradiances at the expense of a reduction of water-use efficiency, which is compensated by a reduced leaf area.
Palabras clave:
Phytochrome B
,
Photosynthesis
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Articulos(IBAM)
Articulos de INST.DE BIOLOGIA AGRICOLA DE MENDOZA
Articulos de INST.DE BIOLOGIA AGRICOLA DE MENDOZA
Articulos(IIBBA)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Citación
Boccalandro, Hernan Esteban; Rugnone, Matias Leandro; Moreno, Javier Edgardo; Ploschuk, Edmundo Leonardo; Serna, Laura; et al.; Phytochrome B enhances photosynthesis at the expense of water-use efficiency in Arabidopsis; American Society of Plant Biologist; Plant Physiology; 150; 2; 4-2009; 1083-1092
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