Responses and Differences in Tolerance to Water Shortage under Climatic Dryness Conditions in Seedlings from Quercus spp. and Andalusian Q. ilex Populations
| Autor: | Rosa Sánchez-Lucas, María Ángeles Castillejo, Bonoso San-Eufrasio, Cristina López-Hidalgo, Jesús V. Jorrín-Novo, María-Dolores Rey, Ana M. Maldonado-Alconada, Victor M. Guerrero-Sánchez |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Stomatal conductance abiotic stress Drought tolerance drought Biology Photosynthesis 01 natural sciences Field capacity Quercus spp 03 medical and health sciences Perlite Quercus ilex Climate change Sugar 030304 developmental biology biodiversity 0303 health sciences Drought Abiotic stress Humidity food and beverages Forestry lcsh:QK900-989 Biodiversity Horticulture climate change lcsh:Plant ecology perlite 010606 plant biology & botany |
| Zdroj: | Forests 11(6), 707 (2020) Forests Volume 11 Issue 6 Scopus RUO: Repositorio Institucional de la Universidad de Oviedo Universidad de Oviedo (UNIOVI) Helvia. Repositorio Institucional de la Universidad de Córdoba instname RUO. Repositorio Institucional de la Universidad de Oviedo Helvia: Repositorio Institucional de la Universidad de Córdoba Universidad de Córdoba Forests, Vol 11, Iss 707, p 707 (2020) |
| Popis: | Analyzing differences in tolerance to drought in Quercus spp., and the characterization of these responses at the species and individual population level, are imperative for the selection of resilient elite genotypes in reforestation programs. The main objective of this work was to evaluate differences in the response and tolerance to water shortage under in five Quercus spp. and five Andalusian Q. ilex populations at the inter- and intraspecies level. Six-month-old seedlings grown in perlite were subjected to drought treatments by withholding water for 28 days under mean 37 ° C temperature, 28 W m-2 solar irradiance, and 41% humidity. The use of perlite as the substrate enabled the establishment of severe drought stress with reduction in water availability from 73% (field capacity) to 28% (dryness), corresponding to matric potentials of 0 and &minus 30 kPa. Damage symptoms, mortality rate, leaf water content, photosynthetic, and biochemical parameters (amino acids, sugars, phenolics, and pigments) were determined. At the phenotypic level, based on damage symptoms and mortality, Q. ilex behaved as the most drought tolerant species. Drought caused a significant decrease in leaf fluorescence, photosynthesis rate, and stomatal conductance in all Quercus spp. analyzed, being less pronounced in Q. ilex. There were not differences between irrigated and non-irrigated Q. ilex seedlings in the content of sugar and photosynthetic pigments, while the total amino acid and phenolic content significantly increased under drought conditions. As a response to drought, living Q. ilex seedlings adjust stomata opening and gas exchange, and keep hydrated, photosynthetically active, and metabolically competent. At the population level, based on damage symptoms, mortality, and physiological parameters, the eastern Andalusian populations were more tolerant than the western ones. These observations inform the basis for the selection of resilient genotypes to be used in breeding and reforestation programs. |
| Databáze: | OpenAIRE |
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