Repositorio UFRO · Omeka S

Drought effects on water use efficiency, freezing tolerance and survival of Eucalyptus globulus and Eucalyptus globulus x nitens cuttings

Primer Autor	Rubilar, Rafael A.
Co-autores	Navarrete-Campos, Dario Bravo, Leon A. Emhart, Veronica Sanhueza, Rebeca
Título	Drought effects on water use efficiency, freezing tolerance and survival of Eucalyptus globulus and Eucalyptus globulus x nitens cuttings
Editorial	SPRINGER
Revista	NEW FORESTS
Lenguaje	en
Resumen	Genetic improvement of Eucalyptus genotypes for drought and frost resistance is essential for successful intensive management of commercial plantations. Understanding the physiological mechanisms that relate water use and frost resistance for highly deployed genotypes may allow for better prediction of their future performance, genetic selection and seedling management for site specific purposes. We studied whether instantaneous water use efficiency (WUE (i) ) may serve as drought, freezing and photoinhibition tolerance predictor by studying its response on six E. globulus clones (Eg1-Eg6) and four E. globulus x E. nitens hybrid seedlings (Egn1-Egn4) under drought and irrigated (control) treatments. Net photosynthesis (A) and transpiration (E) were studied using a gas exchange system in order to calculate WUE (i) (A/E). Simultaneous chlorophyll a fluorescence measurements were performed to assess the non photochemical quenching components. Frost tolerance of plants under control and drought treatments were evaluated by measuring temperatures that exert 50% photoinactivation of photosystem II. Finally, drought tolerance was evaluated by plant survival within each genotype after rehydration. Our results showed significant genotype variability in the rate of soil and xylem water potential decrease during drought. While most of the genotypes reached -4.0 MPa in about 35 days of drought, genotypes Eg6 and Egn4 required 56 days of drought to reach this xylem water potential. WUE (i) exhibited significant differences among genotypes and irrigation treatments. Genotypes Eg5 and Egn4 increased their WUE (i) between 70 and 80% after drought. This was associated with a more conservative control of water loss at the stomatal level combined with maintenance of relatively higher rates of net photosynthesis than the other genotypes under drought conditions. Plants exposed to drought were more freezing tolerant than control plants, having in average 3A degrees C lower LT50 than well irrigated ones. There was no a clear correlation between WUE (i) and drought tolerance or drought-induced photoinhibition, however WUE (i) was inversely correlated with LT50. Our results suggest that WUE (i) is not suitable by itself to select drought tolerant genotypes, but may provide evidence for discarding drought sensitive genotypes. In addition, it could provide valuable information to select for freezing tolerance.
Tipo de Recurso	Artículo original
Description	This research was funded and supported by FONDECYT project No. 1085093, Forestal Mininco S.A., the Faculty of Forest Sciences and the Faculty of Natural and Oceanographic Sciences at the Universidad de Concepcion. All are gratefully acknowledged for his contributions and support. Esta investigación fue financiada y respaldada por el proyecto FONDECYT n.° 1085093, Forestal Mininco S.A., la Facultad de Ciencias Forestales y la Facultad de Ciencias Naturales y Oceanográficas de la Universidad de Concepción. Se agradece profundamente a todos ellos sus contribuciones y apoyo.
doi	10.1007/s11056-012-9305-0
Formato Recurso	pdf
Palabras Claves	Frost Acclimation Drought E. globulus E. nitens CARBON-ISOTOPE DISCRIMINATION FIELD PERFORMANCE COLD-ACCLIMATION LEAF PRODUCTIVITY RESPONSES GRANDIS CLONES FOREST GROWTH Helada Aclimatación Sequía E. globulus nitens DISCRIMINACIÓN DE ISÓTOPOS DE CARBONO RENDIMIENTO EN CAMPO ACLIMATACIÓN AL FRÍO HOJA PRODUCTIVIDAD RESPUESTAS GRANDIS CLONES BOSQUE CRECIMIENTO
Ubicación del archivo	http://dx.doi.org/10.1007/s11056-012-9305-0
Materias	Frost Acclimation Drought E. globulus E. nitens CARBON-ISOTOPE DISCRIMINATION FIELD PERFORMANCE COLD-ACCLIMATION LEAF PRODUCTIVITY RESPONSES GRANDIS CLONES FOREST GROWTH Helada Aclimatación Sequía E. globulus nitens DISCRIMINACIÓN DE ISÓTOPOS DE CARBONO RENDIMIENTO EN CAMPO ACLIMATACIÓN AL FRÍO HOJA PRODUCTIVIDAD RESPUESTAS GRANDIS CLONES BOSQUE CRECIMIENTO
Disciplinas de la OCDE	Silvicultura Genética y Herencia
Título de la cita (Recomendado-único)	Drought effects on water use efficiency, freezing tolerance and survival of Eucalyptus globulus and Eucalyptus globulus x nitens cuttings
Revista/Libro	NEW FORESTS
Tipo de ruta	hibrida verde
Access Rights	restringido
Derechos de acceso	restringido
Idioma	en
Identificador del recurso (Mandatado-único)	Artículo original
Versión del recurso (Recomendado-único)	versión publicada
Entidad financiadora	ANID CONICYT FONDECYT 1085093#Forestal Mininco S.A.#UdeC Faculty of Forest Sciences#UdeC, Faculty of Natural and Oceanographic Sciences
Referencia del Financiador (Mandatado si es aplicable-repetible)	ANID CONICYT FONDECYT 1085093 Forestal Mininco S.A. UdeC Faculty of Forest Sciences UdeC, Faculty of Natural and Oceanographic Sciences
Editorial	SPRINGER
ISSN	0169-4286
Página de inicio (Recomendado-único)	119
Página final (Recomendado-único)	134
Categoría WOS	Silvicultura Forestry
Formato	pdf
Id de Web of Science	WOS:000312786800009