Título
High tolerance to high-light conditions for the protected species Ariocarpus kotschoubeyanus (Cactaceae)
Autor
ERIKA ARROYO PEREZ
JOEL DAVID FLORES RIVAS
CLAUDIA GONZALEZ SALVATIERRA
MARIA LORAINE MATIAS PALAFOX
CECILIA LEONOR JIMÉNEZ SIERRA
Nivel de Acceso
Acceso Abierto
Identificador alterno
doi: https://doi.org/10.1093/conphys/cox042
Materias
Resumen o descripción
"We determined the seasonal ecophysiological performance under perennial plants and under high solar radiation for adult individuals from the ‘living rock’ cactus Ariocarpus kotschoubeyanus, which occurs equally under nurse plants and in open spaces. We evaluated the effective quantum yield of photosystem II (ΦPSII) and the dissipation of thermal energy [non-photochemical quenching (NPQ)] thorough the year. The maximum apparent electron transport rate (ETRmax) and the saturating photosynthetically active photon flux density for PSII (PFDsat) were also determined from rapid light curves. We found that although the ΦPSII was higher in shaded sites under potential nurse plants than in exposed sites, all values were close to the optimal value of 0.83. The high ΦPSII found for A. kotschoubeyanus plants suggests that they use a great proportion of the absorbed light for photosynthesis, under nurse plants as well as in open spaces. We also found higher NPQ values in exposed sites than in shaded ones but only in Autumn, thus reducing the risk of photoinhibition. In addition, the PFDsat was higher in exposed sites than in shaded ones in Spring, Summer and Autumn, but in Winter there were no differences between treatments. We also found high saturating light levels for ETR (PFDsat higher than 1378 μmol m−2 s−1) in all seasons but in winter for shaded and non-shaded plants. Our findings indicate that A. kotschoubeyanus plants use a great proportion of the light that they absorb for photosynthesis. This high tolerance to high-light conditions could explain why A. kotschoubeyanus do not show preferences for protected sites under nurse plants."
Editor
Oxford University Press
Fecha de publicación
julio de 2017
Tipo de publicación
Artículo
Versión de la publicación
Versión publicada
Recurso de información
Formato
application/pdf
Sugerencia de citación
Erika Arroyo-Pérez, Joel Flores, Claudia González-Salvatierra, María L. Matías-Palafox, Cecilia Jiménez-Sierra; High tolerance to high-light conditions for the protected species Ariocarpus kotschoubeyanus (Cactaceae), Conservation Physiology, Volume 5, Issue 1, 1 January 2017, cox042, https://doi.org/10.1093/conphys/cox042
Repositorio Orígen
Repositorio IPICYT
Descargas
359