Thinking in the sustainability of Nothofagus antarctica silvopastoral systems, how differ the responses of seedlings from different provenances to water shortage?

Authors
Bahamonde, Héctor Alejandro; Sánchez-Gómez, David; Gyenge, Javier Enrique; Peri, Pablo Luis; Cellini, Juan Manuel; Aranda, Ismael
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
Nothofagus antarctica, is the most important species of the silvopastoral systems of southern Patagonia. However, there is limited information on the ecophysiological response mechanisms of seedlings for survival under different resource availability regimes, and whether such processes may differ between provenances. In this study, we evaluated the functional response to water shortage of seedlings of four N. antarctica provenances grown under controlled conditions. After an initial full irrigation period, seedlings were subjected to a water shortage cycle. Measurements of the diameter at the base of the stem, net photosynthesis (An), stomatal conductance to water vapour (gs), predawn water potential (Ψpd), osmotic potential at maximum and zero turgor (Π100; Π0), relative water content at zero turgor (RWC0) and maximum modulus of elasticity (Emax) were carried out during the experimental period. Differences between provenances concerning An and gs rates were recorded under full irrigation conditions, but were not detected in association with drought stress. All provenances had similar osmotic potential values (Π100 and Π0) at full irrigation, but water shortage led to significant osmotic potential differences between provenances. During the whole experimental period, no significant differences on RWC0 and Emax values were recorded among provenances. Under full irrigation conditions, all N. antarctica provenances had a similar physiological performance which suggests that environmental conditions may be the main driver for phenotypic differences in this species. From the osmotic adjustment results gathered, it is derived that a major osmoregulation capacity in response to water shortage is a common feature of all the N. antarctica provenances evaluated.
EEA Santa Cruz
EEA Balcarce
Fil: Bahamonde, Héctor Alejandro. INTA. Estación Experimental Agropecuaria Santa Cruz; Argentina. Universidad Nacional de la Patagonia Austral; Argentina
Fil: Sánchez-Gómez, David. Instituto Nacional de Investigaciones Agrarias y Tecnologías Agroalimentarias (INIA). Centro de Investigación Forestal. Department of Forest Ecology and Genetics; España. Instituto Regional de Investigación y Desarrollo Agroalimentario y Forestal de Castilla La Mancha (IRIAF). Centro de Investigación Agroforestal de Albaladejito (CIAF); España
Fil: Gyenge, Javier Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. INTA. Estación Experimental Agropecuaria Balcarce. Agencia de Extensión Rural Tandil; Argentina
Fil: Peri, Pablo Luis. INTA. Estación Experimental Agropecuaria Santa Cruz; Argentina. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Cellini, Juan Manuel. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Laboratorio de Investigacion en Sistemas Ecologicos y Ambientales; Argentina
Fil: Aranda, Ismael. Instituto Nacional de Investigaciones Agrarias y Tecnologías Agroalimentarias (INIA). Centro de Investigación Forestal. Department of Forest Ecology and Genetics; España
Source
Agroforestry Systems 93 (2) : 689–701 (April 2019)
Subject
Nothofagus
Sistemas Silvopascícolas
Sostenibilidad
Plántulas
Agotamiento del Agua
Déficit
Silvopastoral Systems
Sustainability
Seedlings
Water Depletion
Shortages
Nothofagus antarctica
Sistemas Silvopastoriles
Access level
Restricted access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/2343