The combined effect of water stress and temperature on seed germination of Chihuahuan Desert species
Autor: | R.M. Pérez-Sánchez, Joel Flores, Enrique Jurado |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
Ecology biology Moisture Agave salmiana Prosopis laevigata biology.organism_classification Echinocactus platyacanthus 010603 evolutionary biology 01 natural sciences Acacia schaffneri Horticulture Water potential Germination Agave lechuguilla Botany Ecology Evolution Behavior and Systematics 010606 plant biology & botany Earth-Surface Processes |
Zdroj: | Journal of Arid Environments. 146:95-98 |
ISSN: | 0140-1963 |
DOI: | 10.1016/j.jaridenv.2017.07.009 |
Popis: | Interactions between temperature and moisture on seed germination are not clearly understood. We hypothesized that high temperatures and low moisture would inhibit seed germination. We analyzed germination under four temperatures (18–36 °C) and under five water limiting conditions, using Polyethylene glycol (PEG) 6000 (0.0–1.0 MPa) for eight dominant species from Cactaceae ( Isolatocereus dumortieri , Echinocactus platyacanthus , and Ferocactus histrix ), Asparagaceae ( Yucca decipiens , Agave salmiana , and Agave lechuguilla ) and Fabaceae ( Acacia schaffneri and Prosopis laevigata ) from the Chihuahuan Desert. We used the September (when seed germination is more likely to occur) mean (18 °C), the historic highest mean temperature for this month (25 °C), the maximum temperature registered for the month (32 °C), and 36 °C, considering a 4 °C increase. Species had fewer seeds germinating with decreasing moisture and high temperature. Prosopis laevigata however, showed high germination across temperatures and on almost all water potentials. Isolatocereus dumortieri and E. platyacanthus had few seeds germinating at 18 °C but with a negative effect of low water potential for 18 °C and 36 °C. This is the first study including the combined effect of water potential and temperatures on germination of a set of Chihuahuan Desert species. |
Databáze: | OpenAIRE |
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