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Abstract:

Phenotypic plasticity in morphophysiological leaf traits in response to wind was studied in two dominant shrub species of the Patagonian steppe, used as model systems for understanding effects of high wind speed on leaf water relations and hydraulic properties of small woody plants. Morpho-anatomical traits, hydraulic conductance and conductivity and water relations in leaves of wind-exposed and protected crown sides were examined during the summer with nearly continuous high winds. Although exposed sides of the crowns were subjected to higher wind speeds and air saturation deficits than the protected sides, leaves throughout the crown had similar minimum leaf water potential (ΨL). The two species were able to maintain homeostasis in minimum ΨL using different physiological mechanisms. Berberis microphylla avoided a decrease in the minimum ΨL in the exposed side of the crown by reducing water loss by stomatal control, loss of cell turgor and low epidermal conductance. Colliguaja integerrima increased leaf water transport efficiency to maintain transpiration rates without increasing the driving force for water loss in the wind-exposed crown side. Leaf physiological changes within the crown help to prevent the decrease of minimum ΨL and thus contribute to the maintenance of homeostasis, assuring the hydraulic integrity of the plant under unfavorable conditions. The responses of leaf traits that contribute to mechanical resistance (leaf mass per area and thickness) differed from those of large physiological traits by exhibiting low phenotypic plasticity. The results of this study help us to understand the unique properties of shrubs which have different hydraulic architecture compared to trees. © 2013 Springer-Verlag Berlin Heidelberg.

Registro:

Documento: Artículo
Título:Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: Water loss control vs. high hydraulic efficiency
Autor:Iogna, P.A.; Bucci, S.J.; Scholz, F.G.; Goldstein, G.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Grupo de Estudios Biofísicos y Eco-fisiológicos (GEBEF), Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina
Laboratorio de Ecología Funcional (LEF), FCEyN, Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Biology, University of Miami, P.O Box 249118, Coral Gables, FL, United States
Palabras clave:Hydraulic conductance; Osmotic potential; Patagonia; Stomatal conductance; Wind; adaptation; canopy architecture; desert; homeostasis; osmosis; phenotypic plasticity; saturation; shrub; stomatal conductance; water availability; Berberis; Berberis microphylla; Colliguaja integerrima; water; Argentina; article; Berberis; desert climate; Euphorbiaceae; evapotranspiration; histology; homeostasis; metabolism; nonparametric test; phenotype; physiology; plant leaf; plant stoma; pressure; wind; Argentina; Berberis; Desert Climate; Euphorbiaceae; Homeostasis; Phenotype; Plant Leaves; Plant Stomata; Plant Transpiration; Pressure; Statistics, Nonparametric; Water; Wind
Año:2013
Volumen:173
Número:3
Página de inicio:675
Página de fin:687
DOI: http://dx.doi.org/10.1007/s00442-013-2666-z
Título revista:Oecologia
Título revista abreviado:Oecologia
ISSN:00298549
CODEN:OECOB
CAS:water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v173_n3_p675_Iogna

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Citas:

---------- APA ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G. & Goldstein, G. (2013) . Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: Water loss control vs. high hydraulic efficiency. Oecologia, 173(3), 675-687.
http://dx.doi.org/10.1007/s00442-013-2666-z
---------- CHICAGO ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. "Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: Water loss control vs. high hydraulic efficiency" . Oecologia 173, no. 3 (2013) : 675-687.
http://dx.doi.org/10.1007/s00442-013-2666-z
---------- MLA ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. "Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: Water loss control vs. high hydraulic efficiency" . Oecologia, vol. 173, no. 3, 2013, pp. 675-687.
http://dx.doi.org/10.1007/s00442-013-2666-z
---------- VANCOUVER ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: Water loss control vs. high hydraulic efficiency. Oecologia. 2013;173(3):675-687.
http://dx.doi.org/10.1007/s00442-013-2666-z