Gracilaria domingensis (Kützing) Sonder ex Dickie is widely distributed in the Brazilian coast and is one of a few Gracilaria species with occurrence in the southern region of the country. Its commercial importance is in the use in human food (in natura) and knowledge of the physiology is fundamental to make its cultivation successful. The objectives of the present work were to determine the limits of tolerance to temperature and irradiance variations and to evaluate comparatively their effects on growth rates and contents of total soluble proteins and pigments in female gametophytes of G. domingensis from Brazilian tropical region (ES strain) and from −2 −1 subtropical region (SC strain). Variations in temperature (from 15 to 35 °C) and irradiance (from 20 to 250 μmol photons m s ) were tested. Both strains tolerated temperature variation from 15 to 30 °C, but died at 35 °C. The ES strain had higher growth rates −1 −1 (from 3.1 to 6.1% day ) in relation to the SC strain (from 1.3 to 4.1% day ), but the two strains had the highest growth rate at 25 °C. The ES strain had higher concentrations of total soluble proteins at low temperature (15 °C),
Journal of Applied Phycology – Springer Journals
Published: May 31, 2018
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