Phenotypic plasticity as an index of drought tolerance in three Patagonian steppe grasses

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Background and Aims: Despite general agreement regarding the adaptive importance of plasticity, evidence for the role of environmental resource availability in plants is scarce. In arid and semi-arid environments, the persistence and dominance of perennial species depends on their capacity to tolera...

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Detalles Bibliográficos
Autor principal: Couso, Luciana Laura
Otros Autores: Fernández, Roberto Javier
Formato: Artículo
Lenguaje:Inglés
Materias:
BROMUS PICTUS
DRYLAND
MECHANISTIC TRAITS
PAPPOSTIPA SPECIOSA
PERENNIAL GRASSES
PERFORMANCE TRAITS
POA LIGULARIS
TRADE-OFF
WATER
ABOVEGROUND BIOMASS
ADAPTIVE RADIATION
ARID REGION
DROUGHT RESISTANCE
ENVIRONMENTAL CHANGE
FITNESS
GRASS
PERENNIAL PLANT
PERSISTENCE
PHENOTYPIC PLASTICITY
RESOURCE AVAILABILITY
SEMIARID REGION
SOIL SURFACE
STEPPE
TILLERING
WATER AVAILABILITY
ADAPTATION
ARGENTINA
BIOMASS
BROMUS
DROUGHT
GROWTH, DEVELOPMENT AND AGING
METABOLISM
PHENOTYPE
PHYSIOLOGY
PLANT
PLANT ROOT
POA
POACEAE
SOIL
ADAPTATION, PHYSIOLOGICAL
DROUGHTS
PLANT COMPONENTS, AERIAL
PLANT ROOTS
PATAGONIA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Couso.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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100 1 |9 33611  |a Couso, Luciana Laura 
245 0 0 |a Phenotypic plasticity as an index of drought tolerance in three Patagonian steppe grasses 
520 |a Background and Aims: Despite general agreement regarding the adaptive importance of plasticity, evidence for the role of environmental resource availability in plants is scarce. In arid and semi-arid environments, the persistence and dominance of perennial species depends on their capacity to tolerate drought: tolerance could be given on one extreme by fixed traits and, on the other, by plastic traits. To understand drought tolerance of species it is necessary to know the plasticity of their water economy-related traits, i.e. the position in the fixedplastic continuum. Methods: Three conspicuous co-existing perennial grasses from a Patagonian steppe were grown under controlled conditions with four levels of steady-state water availability. Evaluated traits were divided into two groups. The first was associated with potential plant performance and correlated with fitness, and included above-ground biomass, total biomass, tillering and tiller density at harvest. The second group consisted of traits associated with mechanisms of plant adjustment to environmental changes and included root biomass, shoot/root ratio, tiller biomass, length of total elongated leaf, length of yellow tissue divided by time and nal length divided by the time taken to reach nal length. Key, Results and Conclusions: The most plastic species along this drought gradient was the most sensitive to drought, whereas the least plastic and slowest growing was the most tolerant. This negative relationship between tolerance and plasticity was true for fitness-related traits but was trait-dependent for underlying traits. Remarkably, the most tolerant species had the highest positive plasticity [i.e. opposite to the default response to stress] in an underlying trait, directly explaining its drought resistance: it increased absolute root biomass. The niche differentiation axis that allows the coexistence of species in this group of perennial dryland grasses, all limited by soil surface moisture, would be a functional one of fixed versus plastic responses. 
653 0 |a BROMUS PICTUS 
653 0 |a DRYLAND 
653 0 |a MECHANISTIC TRAITS 
653 0 |a PAPPOSTIPA SPECIOSA 
653 0 |a PERENNIAL GRASSES 
653 0 |a PERFORMANCE TRAITS 
653 0 |a POA LIGULARIS 
653 0 |a TRADE-OFF 
653 0 |a WATER 
653 0 |a ABOVEGROUND BIOMASS 
653 0 |a ADAPTIVE RADIATION 
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653 0 |a DROUGHT RESISTANCE 
653 0 |a ENVIRONMENTAL CHANGE 
653 0 |a FITNESS 
653 0 |a GRASS 
653 0 |a PERENNIAL PLANT 
653 0 |a PERSISTENCE 
653 0 |a PHENOTYPIC PLASTICITY 
653 0 |a RESOURCE AVAILABILITY 
653 0 |a SEMIARID REGION 
653 0 |a SOIL SURFACE 
653 0 |a STEPPE 
653 0 |a TILLERING 
653 0 |a TRADE-OFF 
653 0 |a WATER AVAILABILITY 
653 0 |a ADAPTATION 
653 0 |a ARGENTINA 
653 0 |a BIOMASS 
653 0 |a BROMUS 
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653 0 |a METABOLISM 
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653 0 |a PLANT 
653 0 |a PLANT ROOT 
653 0 |a POA 
653 0 |a POACEAE 
653 0 |a SOIL 
653 0 |a ADAPTATION, PHYSIOLOGICAL 
653 0 |a DROUGHTS 
653 0 |a PLANT COMPONENTS, AERIAL 
653 0 |a PLANT ROOTS 
653 0 |a PATAGONIA 
653 0 |a BROMUS PICTUS 
700 1 |9 6385  |a Fernández, Roberto Javier 
773 |t Annals of Botany  |g Vol.100, no.4 (2012), p.849-857 
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900 |a ^aCouso^bL. L. 
900 |a ^aFernández^bR. J. 
900 |a ^aCouso, L.L.^tCátedra de Ecología e IFEVA-CONICET, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, Buenos Aires 1417DSE, Argentina 
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900 |a 857 
900 |a BROMUS PICTUS 
900 |a DRYLAND 
900 |a MECHANISTIC TRAITS 
900 |a PAPPOSTIPA SPECIOSA 
900 |a PERENNIAL GRASSES 
900 |a PERFORMANCE TRAITS 
900 |a POA LIGULARIS 
900 |a TRADE-OFF 
900 |a WATER 
900 |a ABOVEGROUND BIOMASS 
900 |a ADAPTIVE RADIATION 
900 |a ARID REGION 
900 |a DROUGHT RESISTANCE 
900 |a ENVIRONMENTAL CHANGE 
900 |a FITNESS 
900 |a GRASS 
900 |a PERENNIAL PLANT 
900 |a PERSISTENCE 
900 |a PHENOTYPIC PLASTICITY 
900 |a RESOURCE AVAILABILITY 
900 |a SEMIARID REGION 
900 |a SOIL SURFACE 
900 |a STEPPE 
900 |a TILLERING 
900 |a TRADE-OFF 
900 |a WATER AVAILABILITY 
900 |a ADAPTATION 
900 |a ARGENTINA 
900 |a BIOMASS 
900 |a BROMUS 
900 |a DROUGHT 
900 |a GROWTH, DEVELOPMENT AND AGING 
900 |a METABOLISM 
900 |a PHENOTYPE 
900 |a PHYSIOLOGY 
900 |a PLANT 
900 |a PLANT ROOT 
900 |a POA 
900 |a POACEAE 
900 |a SOIL 
900 |a ADAPTATION, PHYSIOLOGICAL 
900 |a DROUGHTS 
900 |a PLANT COMPONENTS, AERIAL 
900 |a PLANT ROOTS 
900 |a PATAGONIA 
900 |a BROMUS PICTUS 
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