Serviços Personalizados
Journal
Artigo
Indicadores
- Citado por SciELO
- Acessos
Links relacionados
- Similares em SciELO
Compartilhar
Botanical Sciences
versão On-line ISSN 2007-4476versão impressa ISSN 2007-4298
Resumo
JACOBO-PEREIRA, César et al. Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico. Bot. sci [online]. 2023, vol.101, n.4, pp.1115-1127. Epub 30-Out-2023. ISSN 2007-4476. https://doi.org/10.17129/botsci.3337.
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.
Palavras-chave : Climate change; mean germination time; riparian tree species; seed ecophysiology; water potential.