Thermal stress thresholds and physiological response in seedlings of Abies hickelii (Flous & Gaussen), an endangered species
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| Autori: | , |
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| Format: | artículo original |
| Status: | Versión publicada |
| Datum izdanja: | 2026 |
| Opis: | Abies hickelii is an endemic, endangered species that is highly sensitive to climatic fluctuations. Increasing drought and extreme temperature events may threaten its long-term survival. This study evaluated the thermal sensitivity of A. hickelii seedlings under controlled conditions. Individuals were exposed to four thermal treatments (control, 28 °C, 32 °C, and 36 °C), and both the time required to reach maximum thermal stress and the rate of foliar damage were assessed. Temperature explained more than 60% of the variability in the time to maximum stress. At 36 °C, seedlings exhibited the highest stress levels and a five-fold increase in damage rate compared to the control, indicating that a critical thermal threshold had been surpassed. Additionally, the progression of damage slowed after exceeding 90% foliar loss, suggesting the presence of a physiological inflection point. Although no significant differences were found among the control, 28 °C, and 32 °C treatments, smaller seedlings showed signs of greaterresistance. Overall, these results highlight the species’ high vulnerability to extreme heat events and provide essential information for guiding conservation and reforestation strategies under climate-change scenarios. |
| Zemlja: | Portal de Revistas TEC |
| Institucija: | Instituto Tecnológico de Costa Rica |
| Repositorio: | Portal de Revistas TEC |
| Jezik: | Español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/8441 |
| Online pristup: | https://revistas.tec.ac.cr/index.php/kuru/article/view/8441 |