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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Sociedad Botánica de México A.C.
2023
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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 |
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Jacobo-Pereira,César Muñiz-Castro,Miguel Ángel Muñoz-Urias,Alejandro Huerta-Martínez,Francisco Martín Vázquez-García,J. Antonio Flores,Joel |
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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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