Are more productive varieties of Paspalum dilatatum less tolerant to drought?

Authors
Couso, Luciana Laura; Gatti, María Laura; Cornaglia, Patricia Susana; Schrauf, Gustavo Enrique; Fernandez Alduncin, Roberto Javier
Publication Year
2010
Language
English
Format
article
Status
Published version
Description
Paspalum dilatatum Poir., is a perennial C4 grass widely distributed in the Argentinean Pampas. The response to water availability for materials developed with forage-production purposes is unknown. We hypothesized that genetic differences between commercial varieties are reflected in their regrowth capacity under water stress. The effect of five levels of constant water supply on three plant varieties (two derived from apomictic materials: 'Relincho' and 'Alonso' and one from sexually-derived material: 'Primo') were examined in the greenhouse. Leaf- and plant-response traits were followed during 38 d after a single defoliation event. Seven response variables were measured: three of them were morphogenetic (leaf elongation rate, leaf appearance rate and leaf elongation duration) and four were structural (number of live leaves, lamina length, tiller biomass and tiller production). The sexual material showed higher values for growth variables than the apomictic varieties (leaf elongation rate, leaf length and tiller biomass) across the environmental range. Apomictic varieties showed a proportionally similar drought response to the sexual material for the seven variables. No intra-specific trade-off (statistical interaction) was found between growth under high water availability conditions and drought tolerance.
Fil: Couso, Luciana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Fil: Gatti, María Laura. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Fil: Cornaglia, Patricia Susana. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Fil: Schrauf, Gustavo Enrique. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Fil: Fernandez Alduncin, Roberto Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
Subject
DROUGHT TOLERANCE
PASPALUM DILATATUM
PHENOTYPIC PLASTICITY
PLANT BREEDING
PRODUCTIVITY
TRADE-OFF
Agricultura
Agricultura, Silvicultura y Pesca
CIENCIAS AGRÍCOLAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/71422