Abstract
A strain selection procedure using Gracilaria verrucosa gametophytic sporelings was found to be an efficient tool for the improvement of Gracilaria strains. Two strains, C-2 and A-18, which were isolated and grown clonally, showed higher growth rates under high and low temperature conditions, respectively, than the local Gracilaria conferta. Growth rate, photosynthesis and chlorophyll, which were measured under different temperature and photon flux densities, demonstrated an overall advantage of the selected strains over the wild type strains of both G. verrucosa and G. conferta. Growth rates were also generally in positive correlation with the carboxylase activity of Rubisco. The G. verrucosa wild type also had a 40% higher agar content than G. conferta. The selected strains thus showed higher potential for outdoor cultivation than local wild type populations.
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Levy, I., Beer, S. & Friedlander, M. Strain selection in Gracilaria spp. 2. Selection for high and low temperature resistance in G. verrucosa sporelings. J Appl Phycol 2, 163–171 (1990). https://doi.org/10.1007/BF00023378
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DOI: https://doi.org/10.1007/BF00023378