IBIS-Flora

Angiosperm Flora of India

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

Publication Type:Journal Article
Year of Publication:2010
Authors:Couso, LL, Gatti, ML, Cornaglia, PS, Schrauf, GE, Fernández, RJ
Journal:Grass and Forage Science
Volume:65
Issue:3
Date Published:2010
ISBN Number:1365-2494
Keywords:drought tolerance, Paspalum, Paspalum dilatatum, Phenotypic plasticity, plant breeding, Productivity, trade-off
Abstract:

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.

URL:http://dx.doi.org/10.1111/j.1365-2494.2010.00748.x
Short Title:Grass and Forage Science
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith