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Título

Regulation of photosynthesis and stomatal and mesophyll conductance under water stress and recovery in olive trees: Correlation with gene expression of carbonic anhydrase and aquaporins

Autor Pérez Martín, Alfonso ; Michelazzo, C.; Torres Ruiz, José Manuel ; Flexas, Jaume; Fernández Luque, José Enrique ; Sebastiani, Lorenzo; Díaz-Espejo, Antonio
Palabras clave Mesophyll conductance
Olea
OePIP
AQP
Photosynthesis limitations
Stomatal conductance
Water stress.
CA
Fecha de publicación may-2014
EditorOxford University Press
Citación Journal of Experimental Botany 65: 3143- 3156 (2014)
ResumenThe hypothesis that aquaporins and carbonic anhydrase (CA) are involved in the regulation of stomatal (gs) and mesophyll (gm) conductance to CO2 was tested in a short-term water-stress and recovery experiment in 5-year-old olive plants (Olea europaea) growing outdoors. The evolution of leaf gas exchange, chlorophyll fluorescence, and plant water status, and a quantitative analysis of photosynthesis limitations, were followed during water stress and recovery. These variables were correlated with gene expression of the aquaporins OePIP1.1 and OePIP2.1, and stromal CA. At mild stress and at the beginning of the recovery period, stomatal limitations prevailed, while the decline in gm accounted for up to 60% of photosynthesis limitations under severe water stress. However, gm was restored to control values shortly after rewatering, facilitating the recovery of the photosynthetic rate. CA was downregulated during water stress and upregulated after recovery. The use of structural equation modelling allowed us to conclude that both OePIP1.1 and OePIP2.1 expression could explain most of the variations observed for gs and gm. CA expression also had a small but significant effect on gm in olive under water-stress conditions. © The Author 2014.
Descripción 14 páginas.-- 8 figuras.-- 61 referencias.-- Supplementari data in http://jxb.oxfordjournals.org/content/suppl/2014/03/21/eru160.DC1/jexbot113605_file001.pdf
Versión del editorhttp://dx.doi.org/10.1093/jxb/eru160
URI http://hdl.handle.net/10261/115810
DOI10.1093/jxb/eru160
Identificadoresdoi: 10.1093/jxb/eru160
issn: 1460-2431
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