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26 results on '"Pérez-García, Félix"'

3. Evaluation of reproductive success and conservation strategies for Senecio coincyi (Asteraceae), a narrow and threatened endemic plant of central western Spain

Author

Pérez-García Félix, Guerrero-García Silvia, and Martínez-García Felipe

Subjects
Cypsela germination, intraspecific variability, plant conservation, reproductive biology, Senecio coincyi, Spain, Biology (General), QH301-705.5
Abstract

Senecio coincyi (Asteraceae) is a threatened endemic plant of central western Spain. The reproductive biology of this species in relation to the characteristics of its habitats and the possible strategies for its conservation, were studied. The area of occupancy, habitat types and size of 13 known subpopulations of S. coincyi was evaluated. Germination tests were carried out to assess the effect of temperature and light regimes, and the possible intraspecific variation on the cypsela germination. Cypselas reached very high germination percentages (90-100%) from 15ºC to 30ºC. However, the germination decreased (by about 19%) at 10ºC. The light conditions assayed did not significantly affect cypsela germination. In conclusion, S. coincyi showed high sexual reproduction ability, and therefore its conservation problems are not due to agents related to its reproductive biology, but to others, such as the alteration of its habitat caused by the presence of livestock.

Published
2012
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7. Variabilidad en el tono muscular del recto femoral mediante el tratamiento con kinesiotaping frente a la Aplicación con Richelli´s pain reliever, en jugadores del Cordoba B

Author

Pérez García, Félix and González Pérez, Israel

Subjects
Quadriceps, Máster universitario en fisioterapia y readaptación en el deporte, kinesiotape, Fisioterapia, Muscle tone, Instrument-assisted
Abstract

El objetivo de esta investigación fue evaluar la variabilidad del tono muscular en el recto anterior del cuádriceps de la pierna dominante con la aplicación de vendaje neuromuscular (VN) o Kinesio Taping (KT) frente a la aplicación de la técnica manual instrumentalizada con Richelli´s Pain Reliever. (PR). Se obtiene una muestra aleatoria de 16 futbolistas del Córdoba B con edades de 21.56 ± 1.31 años. Las mediciones se realizan con el Myoton Pro. Se hace una medición previa al tratamiento, posteriormente se le realiza el tratamiento específico a cada uno de ellos. En un plazo de 24 horas se realiza una nueva medición. Se procede a analizar los datos obtenidos encontrándose cambios estadísticamente significativos en la disminución del tono muscular del recto anterior del cuádriceps en la pierna dominante con la aplicación de PR frente a KT (p=0.045).

Published
2018

9. Seed dormancy and germination of Heliotropium europaeum L. (Boraginaceae), a Widespread Summer-annual weed

Author

Veiga-Barbosa, Luciana and Pérez-García, Félix

Subjects
Seed imbibition, Physiological dormancy, Common heliotrope, Cold stratification, food and beverages, Gibberellic acid
Abstract

Heliotropium europaeum L. (Boraginaceae) is a summer-annual weed of European origin. The aim of this study was to investigate the germination requirements of H. europaeum and to determine if seeds present some type of dormancy. Cold stratification and soaking in gibberellic acid (GA3) were used as pre-sowing treatments for breaking dormancy in H. europaeum seeds. Untreated seeds showed an extremely high dormancy at all tested incubation temperatures (only ≤ 2% of them germinated after 8 weeks of incubation), and GA3 and cold stratification drastically improved germination percentages (≥ 80%). The highest germination percentages of H. europaeum seeds soaked in GA3 were achieved at the highest constant temperature (30ºC) and alternating temperatures (25/15ºC and 30/20ºC). Moreover, the lowest germination rates were observed at the two lowest constant temperatures (15ºC and 20ºC). Germination of seeds soaked in GA3 increased as concentration of acid increased (from 10 to 1000 mg L -1 ). Similarly, cold stratification increased germination at all tested stratification periods (from 7 to 360 days). Since embryos are fully developed and seed mass increased 52% after 24 hours of imbibition, showing that seed coat is water permeable, we conclude that H. europaeum seeds present physiological dormancy. Cold stratification and treatment with GA3 were two effective methods for overcoming the physiological dormancy in seeds of H. europaeum. Knowledge of germination requirements may aid in developing tools and strategies for management of this weed.

Published
2016

26. Seed cryopreservation of Halimium and Helianthemum species.

Author

Pérez-García F and González-Benito ME

Subjects
Germination physiology, Mediterranean Region, Nitrogen, Cistaceae physiology, Cryopreservation methods, Seeds
Abstract

Seed germination of four Halimium species [H. atriplicifolium, H.hHalimifolium, H. ocymoides, H. umbellatum] and eight Helianthemum species [H. almeriense pau, H. appeninum.,H. cinereum, H. hirtum, H. marifolium, H. nummularium, H. syriacum, H. squamatum], all cistaceae species from the mediterranean region, was studied after seed storage in liquid nitrogen (Ln, -196C) for four months. In all samples assayed, mechanical scarification of the seed coat was carried out to enhance seed germination. For most samples studied, final germination percentages were unaffected by storage of seeds in Ln, both for intact seeds and for scarified seeds. The germination rate of cryopreserved seeds, expressed as days to reach 50 percent of the final germination percentage, was lower only for four samples of intact seeds and for three samples of scarified seeds. Therefore, this study shows that seed cryopreservation could be a suitable procedure for the long-term seed conservation of several Halimium and Helianthemum species.

Published
2008

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