Differential water-use strategies and drought resistance in Trichloris crinita plants from contrasting aridity origins

Authors
Quiroga, Raul Emiliano; Fernandez, Roberto J.; Golluscio, Rodolfo A.; Blanco, Lisandro Javier
Publication Year
2013
Language
English
Format
article
Status
Published version
Description
In arid environments, water availability is the main limiting factor for primary production, and it is expected that not only drought-resistance, but also plant strategies for soil water use will be under natural selection. Our aim was to investigate the strategies of soil water use and the responses to water shortage that lead to variability in drought resistance in Trichloris crinita plants (a native forage grass of northwestern Argentina) from sites with contrasting aridity. We established a common-garden experiment with plants from relatively “arid” and “humid” sites (326 and 625 mm mean annual precipitation, respectively). During 6 weeks, plants were subjected to two contrasting watering levels: control and drought. We found different water use strategies and drought resistance between plants from arid and humid sites: the former used water more conservatively and grew more under drought. During the first 2 weeks of the drought treatment, plants from arid sites dried out the soil slower than those from humid sites. Plants from arid sites subjected to drought showed less leaf senescence and a greater leaf elongation rate and biomass of green leaves than those from humid sites. This variability in adaptation to drought in T. crinita plants could be used to select plant materials for arid land revegetation or to be incorporated into breeding programs for forage purposes.
EEA Catamarca
Fil: Quiroga, Raul Emiliano. INTA. Estación Experimental Agropecuaria Catamarca; Argentina
Fil: Fernandez, Roberto J. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de investigación Fisiológicas y Ecológicas Vinculado a la Agricultura; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Ecología; Argentina
Fil: Golluscio, Rodolfo A. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de investigación Fisiológicas y Ecológicas Vinculado a la Agricultura; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Forrajicultura; Argentina
Fil: Blanco, Lisandro Javier. INTA. Estación Experimental Agropecuaria La Rioja; Argentina
Source
Plant Ecology 214 (8) : 1027–1035 (August 2013)
Subject
Gramineas
Resistencia a la Sequía
Uso del Agua
Zona Arida
Grasses
Drought Resistance
Water Use
Arid Zones
Trichloris Crinita
Access level
Restricted access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/2745