Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico

Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico

Abstract Background: Magnolia pugana populations are declining, in addition, it is estimated that precipitation will decrease by up to 10 % and temperatures will increase (2-4 °C) under the most severe climate change scenario, which may affect germination. Hypotheses: The interaction of increased temperature and decreased water potential reduces and delays the germination of Magnolia pugana seeds. Studied species: Magnolia pugana, an endangered species endemic to western Mexico. Study site and dates: Southern Zacatecas and central Jalisco, Mexico. April 2019. Materials and methods: Seed viability was evaluated with tetrazolium test. In addition, the effects of temperature (24, 28, and 37 °C), water potential with PEG 8000 (0, -0.3, -0.6, -0.9, -1.2 MPa) and its interaction on the percentage and mean germination time were analyzed with factorial ANOVA tests. Results: Viability was 80 %. The interactions between temperature and water potential on germination percentage and mean germination time were significant. There was no germination at 37 °C. The highest germination (78 %) was at 24 °C and -0.3 MPa, while the lowest (3 %) was at 28 °C and -0.6 MPa. The control treatment (24 °C and 0 MPa) facilitated germination in a shorter time (23.9 ± 1.5 days). At 28 °C and -0.9 MPa, the mean germination time was slowed by 1.5 times. Conclusions: Magnolia pugana germinability was reduced by the interaction between low water potentials and increased temperature, conditions predicted by future climate change scenarios, therefore its vulnerability to extinction could increase.

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Main Authors: Jacobo-Pereira,César, Muñiz-Castro,Miguel Ángel, Muñoz-Urias,Alejandro, Huerta-Martínez,Francisco Martín, Vázquez-García,J. Antonio, Flores,Joel
Format: Digital revista
Language:English
Published: Sociedad Botánica de México A.C. 2023
Online Access:http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S2007-42982023000401115
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spelling oai:scielo:S2007-429820230004011152023-10-24Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western MexicoJacobo-Pereira,CésarMuñiz-Castro,Miguel ÁngelMuñoz-Urias,AlejandroHuerta-Martínez,Francisco MartínVázquez-García,J. AntonioFlores,Joel Climate change mean germination time riparian tree species seed ecophysiology water potential Abstract Background: Magnolia pugana populations are declining, in addition, it is estimated that precipitation will decrease by up to 10 % and temperatures will increase (2-4 °C) under the most severe climate change scenario, which may affect germination. Hypotheses: The interaction of increased temperature and decreased water potential reduces and delays the germination of Magnolia pugana seeds. Studied species: Magnolia pugana, an endangered species endemic to western Mexico. Study site and dates: Southern Zacatecas and central Jalisco, Mexico. April 2019. Materials and methods: Seed viability was evaluated with tetrazolium test. In addition, the effects of temperature (24, 28, and 37 °C), water potential with PEG 8000 (0, -0.3, -0.6, -0.9, -1.2 MPa) and its interaction on the percentage and mean germination time were analyzed with factorial ANOVA tests. Results: Viability was 80 %. The interactions between temperature and water potential on germination percentage and mean germination time were significant. There was no germination at 37 °C. The highest germination (78 %) was at 24 °C and -0.3 MPa, while the lowest (3 %) was at 28 °C and -0.6 MPa. The control treatment (24 °C and 0 MPa) facilitated germination in a shorter time (23.9 ± 1.5 days). At 28 °C and -0.9 MPa, the mean germination time was slowed by 1.5 times. Conclusions: Magnolia pugana germinability was reduced by the interaction between low water potentials and increased temperature, conditions predicted by future climate change scenarios, therefore its vulnerability to extinction could increase.info:eu-repo/semantics/openAccessSociedad Botánica de México A.C.Botanical Sciences v.101 n.4 20232023-12-01info:eu-repo/semantics/articletext/htmlhttp://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S2007-42982023000401115en10.17129/botsci.3337
institution SCIELO
collection OJS
country México
countrycode MX
component Revista
access En linea
databasecode rev-scielo-mx
tag revista
region America del Norte
libraryname SciELO
language English
format Digital
author Jacobo-Pereira,César
Muñiz-Castro,Miguel Ángel
Muñoz-Urias,Alejandro
Huerta-Martínez,Francisco Martín
Vázquez-García,J. Antonio
Flores,Joel
spellingShingle Jacobo-Pereira,César
Muñiz-Castro,Miguel Ángel
Muñoz-Urias,Alejandro
Huerta-Martínez,Francisco Martín
Vázquez-García,J. Antonio
Flores,Joel
Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
author_facet Jacobo-Pereira,César
Muñiz-Castro,Miguel Ángel
Muñoz-Urias,Alejandro
Huerta-Martínez,Francisco Martín
Vázquez-García,J. Antonio
Flores,Joel
author_sort Jacobo-Pereira,César
title Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
title_short Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
title_full Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
title_fullStr Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
title_full_unstemmed Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
title_sort effect of temperature and drought stress on germination of magnolia pugana, an endangered species from western mexico
description Abstract Background: Magnolia pugana populations are declining, in addition, it is estimated that precipitation will decrease by up to 10 % and temperatures will increase (2-4 °C) under the most severe climate change scenario, which may affect germination. Hypotheses: The interaction of increased temperature and decreased water potential reduces and delays the germination of Magnolia pugana seeds. Studied species: Magnolia pugana, an endangered species endemic to western Mexico. Study site and dates: Southern Zacatecas and central Jalisco, Mexico. April 2019. Materials and methods: Seed viability was evaluated with tetrazolium test. In addition, the effects of temperature (24, 28, and 37 °C), water potential with PEG 8000 (0, -0.3, -0.6, -0.9, -1.2 MPa) and its interaction on the percentage and mean germination time were analyzed with factorial ANOVA tests. Results: Viability was 80 %. The interactions between temperature and water potential on germination percentage and mean germination time were significant. There was no germination at 37 °C. The highest germination (78 %) was at 24 °C and -0.3 MPa, while the lowest (3 %) was at 28 °C and -0.6 MPa. The control treatment (24 °C and 0 MPa) facilitated germination in a shorter time (23.9 ± 1.5 days). At 28 °C and -0.9 MPa, the mean germination time was slowed by 1.5 times. Conclusions: Magnolia pugana germinability was reduced by the interaction between low water potentials and increased temperature, conditions predicted by future climate change scenarios, therefore its vulnerability to extinction could increase.
publisher Sociedad Botánica de México A.C.
publishDate 2023
url http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S2007-42982023000401115
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