温度和干旱胁迫对墨西哥西部濒危植物白玉兰发芽的影响

IF 1.1 4区 生物学 Q3 PLANT SCIENCES Botanical Sciences Pub Date : 2023-09-04 DOI:10.17129/botsci.3337
César Jacobo-Pereira, M. Muñiz-Castro, A. Muñoz-Urias, F. M. Huerta-Martínez, J. Vázquez-García, Joel Flores
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引用次数: 0

摘要

背景:白玉兰的数量正在减少,此外,据估计,在最严重的气候变化情况下,降水量将减少10%,温度将升高(2-4°C),这可能会影响发芽。假设:温度升高和水势降低的相互作用降低并延迟了白玉兰种子的发芽。研究物种:白玉兰,墨西哥西部特有的濒危物种。研究地点和日期:墨西哥萨卡特卡斯南部和哈利斯科中部。2019年4月。材料与方法:采用四氮唑试验评价种子活力。此外,还用因子方差分析法分析了温度(24、28和37°C)、PEG 8000的水势(0、-0.3、-0.6、-0.9、-1.2MPa)及其相互作用对发芽率和平均发芽时间的影响。结果:存活率为80%。温度和水势对发芽率和平均发芽时间的影响是显著的。在37°C时没有发芽。发芽率最高(78%)在24°C和-0.3MPa时,而发芽率最低(3%)在28°C和-0.16MPa时。对照处理(24°C和0 MPa)在较短的时间内(23.9±1.5天)促进了发芽。在28°C和-0.9 MPa下,平均发芽时间减慢了1.5倍。结论:低水势和高温之间的相互作用降低了蒲木兰的发芽能力,这是未来气候变化情景预测的条件,因此其灭绝的脆弱性可能会增加。
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Effect of temperature and drought stress on germination of Magnolia pugana, an endangered species from western Mexico
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 couldincrease.
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来源期刊
Botanical Sciences
Botanical Sciences Agricultural and Biological Sciences-Plant Science
CiteScore
1.90
自引率
21.40%
发文量
71
审稿时长
16 weeks
期刊介绍: Botanical Sciences welcomes contributions that present original, previously unpublished results in Botany, including disciplines such as ecology and evolution, structure and function, systematics and taxonomy, in addition to other areas related to the study of plants. Research reviews are also accepted if they summarize recent advances in a subject, discipline, area, or developmental trend of botany; these should include an analytical, critical, and interpretative approach to a specific topic. Acceptance for reviews will be evaluated first by the Review Editor. Opinion Notes and Book Reviews are also published as long as a relevant contribution in the study of Botany is explained and supported.
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