Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters

Abstract Sensitivity to water availability is a key physiological trait for grassland species located in arid and semiarid environments, where successful germination is closely related to rainfall dynamics. Festuca pallescens inhabits diverse environments along a steep precipitation gradient in Nort...

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Autores principales:	Aldana S. López, D. R. López, M. V. Arana, D. Batlla, P. Marchelli
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d224a9d3501041cd80feefa4381208d8
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spelling	oai:doaj.org-article:d224a9d3501041cd80feefa4381208d82021-12-02T15:53:01ZGermination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters10.1038/s41598-021-89901-12045-2322https://doaj.org/article/d224a9d3501041cd80feefa4381208d82021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89901-1https://doaj.org/toc/2045-2322Abstract Sensitivity to water availability is a key physiological trait for grassland species located in arid and semiarid environments, where successful germination is closely related to rainfall dynamics. Festuca pallescens inhabits diverse environments along a steep precipitation gradient in North Patagonia, thus offering a suitable model for the study of germination behavior in response to water availability. By analyzing germination in nine populations using a hydrotime model approach, we aimed to find within-species variation. Seed population behavior was analyzed under different hydric conditions using hydrotime model parameters (hydrotime, mean base water potential and its standard deviation). We estimated the mean base water potential for F. pallescens (ψb(50) = − 2.79 ± 0.45 MPa), which did not differ significantly between populations. However, the hydrotime parameter (θH) varied markedly, suggesting physiological adaptation to local environments. Higher values of θH were found in populations located at the extremes of the distribution gradient, indicating that germination may be prevented or delayed in conditions that are suboptimal for the species. Since the variation in hydrotime model parameters did not follow a cline, micro-environmental cues may have the greatest influence on the physiological behavior of the species, rather than the macroscale rainfall gradient.Aldana S. LópezD. R. LópezM. V. AranaD. BatllaP. MarchelliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aldana S. López D. R. López M. V. Arana D. Batlla P. Marchelli Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
description	Abstract Sensitivity to water availability is a key physiological trait for grassland species located in arid and semiarid environments, where successful germination is closely related to rainfall dynamics. Festuca pallescens inhabits diverse environments along a steep precipitation gradient in North Patagonia, thus offering a suitable model for the study of germination behavior in response to water availability. By analyzing germination in nine populations using a hydrotime model approach, we aimed to find within-species variation. Seed population behavior was analyzed under different hydric conditions using hydrotime model parameters (hydrotime, mean base water potential and its standard deviation). We estimated the mean base water potential for F. pallescens (ψb(50) = − 2.79 ± 0.45 MPa), which did not differ significantly between populations. However, the hydrotime parameter (θH) varied markedly, suggesting physiological adaptation to local environments. Higher values of θH were found in populations located at the extremes of the distribution gradient, indicating that germination may be prevented or delayed in conditions that are suboptimal for the species. Since the variation in hydrotime model parameters did not follow a cline, micro-environmental cues may have the greatest influence on the physiological behavior of the species, rather than the macroscale rainfall gradient.
format	article
author	Aldana S. López D. R. López M. V. Arana D. Batlla P. Marchelli
author_facet	Aldana S. López D. R. López M. V. Arana D. Batlla P. Marchelli
author_sort	Aldana S. López
title	Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
title_short	Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
title_full	Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
title_fullStr	Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
title_full_unstemmed	Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters
title_sort	germination response to water availability in populations of festuca pallescens along a patagonian rainfall gradient based on hydrotime model parameters
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d224a9d3501041cd80feefa4381208d8
work_keys_str_mv	AT aldanaslopez germinationresponsetowateravailabilityinpopulationsoffestucapallescensalongapatagonianrainfallgradientbasedonhydrotimemodelparameters AT drlopez germinationresponsetowateravailabilityinpopulationsoffestucapallescensalongapatagonianrainfallgradientbasedonhydrotimemodelparameters AT mvarana germinationresponsetowateravailabilityinpopulationsoffestucapallescensalongapatagonianrainfallgradientbasedonhydrotimemodelparameters AT dbatlla germinationresponsetowateravailabilityinpopulationsoffestucapallescensalongapatagonianrainfallgradientbasedonhydrotimemodelparameters AT pmarchelli germinationresponsetowateravailabilityinpopulationsoffestucapallescensalongapatagonianrainfallgradientbasedonhydrotimemodelparameters
_version_	1718385538986147840

Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters

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