Tissue growth and branch induction of the red seaweed Gracilariopsis persica and Gp. chorda

Abstract

Tissue growth, branch induction and tolerance of Gracilariopsis chorda from Korea were investigated under a variation of temperature (10-35°C), light irradiation (10-80 μmol.m-2.s-1), salinity (20-45‰), light period (0-24L), and medium volume (10-100%) in unialgal culture. Gp. chorda shown maximum growth rates with 20°C under 40μmol.m-2.s-1 with 16L:8D in 27‰ salinity. The relevance observed between light irradiation as an enhancement factor on branch induction that optimum ranges was 10μmol.m-2.s-1 for Gp. chorda. Daily growth rates of Gp. chorda was 2.1% day-1. To provide axenic unialgal culture, effects of several preservative chemical as contamination inhibitor and influence on relative growth rates of samples examined.