Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability

We studied morphological and growth responses to drought of two sub-populations of Bromus pictus from communities with soils with different water availability from the Patagonian steppe. After a process of acclimatization common to both sub-populations, individuals from both sub-populations were sub...

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Autores principales:	ROTUNDO,JOSÉ L, CIPRIOTTI,PABLO A, GUNDEL,PEDRO E
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2006
Materias:	arid lands drought ecotypes genetic variation soil depth
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100006
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spelling	oai:scielo:S0716-078X20060001000062006-04-25Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availabilityROTUNDO,JOSÉ LCIPRIOTTI,PABLO AGUNDEL,PEDRO E arid lands drought ecotypes genetic variation soil depth We studied morphological and growth responses to drought of two sub-populations of Bromus pictus from communities with soils with different water availability from the Patagonian steppe. After a process of acclimatization common to both sub-populations, individuals from both sub-populations were subjected to three levels of water availability during 44 days. Independently of the water availability treatment, the sub-population from the community of high soil water availability showed higher aboveground relative growth rate (RGR) and higher leaf size (area and weight) compared to the sub-population from the community of low soil water availability. These results prove the expected evolution of higher growth rates and leaf sizes in resource rich environments. The sub-population from the community with low water availability also showed a higher tillering rate and a more prostrate morph than the sub-population from the community with high water availability. A higher number of small tillers may be a useful strategy for a quick response to water inputs and for distribute the risk of drought-induced mortality. A more prostrate morph may also present advantages like reducing the area exposed to dry air. The results obtained showed that soil heterogeneity may promote genetic variation. We were unable to detect statistically significant interactions between population and water availability treatments. The genetic variation found between the populations may be useful to develop breeding programs of a native species and may also increase the evolutionary potential of a native species to adapt to environmental changesinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.79 n.1 20062006-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100006en10.4067/S0716-078X2006000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	arid lands drought ecotypes genetic variation soil depth
spellingShingle	arid lands drought ecotypes genetic variation soil depth ROTUNDO,JOSÉ L CIPRIOTTI,PABLO A GUNDEL,PEDRO E Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
description	We studied morphological and growth responses to drought of two sub-populations of Bromus pictus from communities with soils with different water availability from the Patagonian steppe. After a process of acclimatization common to both sub-populations, individuals from both sub-populations were subjected to three levels of water availability during 44 days. Independently of the water availability treatment, the sub-population from the community of high soil water availability showed higher aboveground relative growth rate (RGR) and higher leaf size (area and weight) compared to the sub-population from the community of low soil water availability. These results prove the expected evolution of higher growth rates and leaf sizes in resource rich environments. The sub-population from the community with low water availability also showed a higher tillering rate and a more prostrate morph than the sub-population from the community with high water availability. A higher number of small tillers may be a useful strategy for a quick response to water inputs and for distribute the risk of drought-induced mortality. A more prostrate morph may also present advantages like reducing the area exposed to dry air. The results obtained showed that soil heterogeneity may promote genetic variation. We were unable to detect statistically significant interactions between population and water availability treatments. The genetic variation found between the populations may be useful to develop breeding programs of a native species and may also increase the evolutionary potential of a native species to adapt to environmental changes
author	ROTUNDO,JOSÉ L CIPRIOTTI,PABLO A GUNDEL,PEDRO E
author_facet	ROTUNDO,JOSÉ L CIPRIOTTI,PABLO A GUNDEL,PEDRO E
author_sort	ROTUNDO,JOSÉ L
title	Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
title_short	Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
title_full	Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
title_fullStr	Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
title_full_unstemmed	Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability
title_sort	morphological and growth responses to water stress of two sub-populations of bromus pictus from soils with contrasting water availability
publisher	Sociedad de Biología de Chile
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100006
work_keys_str_mv	AT rotundojosel morphologicalandgrowthresponsestowaterstressoftwosubpopulationsofbromuspictusfromsoilswithcontrastingwateravailability AT cipriottipabloa morphologicalandgrowthresponsestowaterstressoftwosubpopulationsofbromuspictusfromsoilswithcontrastingwateravailability AT gundelpedroe morphologicalandgrowthresponsestowaterstressoftwosubpopulationsofbromuspictusfromsoilswithcontrastingwateravailability
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Morphological and growth responses to water stress of two sub-populations of Bromus pictus from soils with contrasting water availability

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