Daily and seasonal variations of optimum quantum yield and phenolic compounds in Cystoseira tamariscifolia (Phaeophyta) |
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Authors: | R T Abdala-Díaz A Cabello-Pasini E Pérez-Rodríguez R M Conde Álvarez F L Figueroa |
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Institution: | (1) Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, Campus Universitario de Teatinos s/n, 29071 Málaga, Spain;(2) Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, A.P. 453, Ensenada, Baja California, 22800, México |
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Abstract: | Effects of solar radiation on phenolic compound concentrations and photosynthetic activity, estimated as in vivo chlorophyll
fluorescence, in the brown alga Cystoseira tamariscifolia (Hudson) Papenfuss were analyzed in southern Spain from June 1988 to July 2000. Annual and diurnal variations of optimum
quantum yield were negatively correlated with incident irradiance. Optimum quantum yield decreased as irradiance increased
at noon, and yield values recovered in the afternoon suggesting a dynamic photoinhibition. The annual and daily fluctuations
of phenolic compound concentration in the tissue of C. tamariscifolia showed contrasting patterns. There was an annual cycle of phenolic compound concentration in the apical thallus, which was
positively correlated with incident irradiance. The increase in phenolic compounds, however, was twofold greater in the first
half of the year than the decrease during the second half of the year. In contrast to the annual cycle, there appeared to
be a negative correlation between phenolic compound concentration and irradiance in the summer months while no specific relationship
was observed in the fall–winter months. Loss of phenolic compounds from the tissue to the surrounding water was increased
as irradiation dosage increased. This suggests that the decrease of phenolic compounds during the diurnal cycle might be regulated
by the exudation of these compounds at high irradiances in the field. Collectively, our results suggest that, like dynamic
photoinhibition, the rapid synthesis and turnover time of phenolic compounds in the tissue of C. tamariscifolia might serve as photoprotective mechanisms against high irradiances. |
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