INVESTIGADORES
BERLI Federico Javier
congresos y reuniones científicas
Título:
Photosynthetic response of Aristotelia chilensis clones obtained from tres expossed to contrasting radiation environments in the Andean-Patagonian forests of Argentina
Autor/es:
ROLDAN C.; VARELA S.; CABALLE G.; BERLI F.
Lugar:
Santa Fé
Reunión:
Congreso; XXXIII Reunión Argentina de Fisiología Vegetal (RAFV); 2021
Institución organizadora:
Sociedad Argentina de Fisiología Vegetal (SAFV)
Resumen:
Maqui (Aristotelia chilensis) is a native berry of the Andean-Patagonian forests, with one of the highest antioxidant levels currently known for this region and great interest for domestication purposes. The objective of our study was to characterize the photosynthetic response of 6 maqui clones obtained from trees at two contrasting radiation environments (RE) of two natural forest (coihue forest: shady area and cypress forest: sunny area) after growing 1,5 years in a common garden at full sunlight. We hypothesize that clones from both RE will have high and equal values of maximum photosynthesis when grown under high light conditions. Curves of net photosynthesis vs. photosynthetically active radiation (PAR) were performed with an IRGA (LiCor-6400). Three mathematical models (nonrectangular hyperbolas) were used to evaluate the maximum photosynthetic rate (Pmax), dark respiration rate (RD), and quantum yield (Φ(I0)). Also, we measured specific leaf area (SLA) on full sun-exposed leaves of both groups of clones. Pmax was significantly different and the clones from sunny environments showed higher values than those from shady environments. RD and Φ(I0) were similar between clones of different RE. Clones from shady environments have higher SLA than clones from sunny environments, in correspondence with their parental environment. Under high radiation conditions, clones from shady environments maintain their leaf morphology with high SLA, but make partial physiological adjustments, with lower photosynthetic rate and the same RD than clones from sunny environments. These results showed more inefficient carbon assimilation and, therefore, lower growth potential for shady clones in full sun conditions.
