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We studied the chemical structure and yield of low-molecular-mass carbohydrates (LMMC) and soluble polysaccharides produced by green and red morphs of  Gracilaria domingensis . Red plants had higher amounts of the LMMC floridoside than green morphs (324.4±8.1 and 220.1±6.0 μmol g -1  dry biomass, respectively). The yield of polysaccharides was similar between morphs (46.3±5.8% for the red and 41.4±8.3% for the green) as was the monosaccharide composition. The same agaran (6- O -methylated and sulphated) was isolated from both morphs, as determined by  13 C NMR spectroscopy analysis. The floridean starch content (mg g -1  dry biomass) for the green morphs (116.2±1.7) was lower than that of the red morphs (143.9±1.8). This study showed that green and red morphs of  G. domingensis  are similar in their polysaccharide composition, but differ in the short-term storage compounds, starch and floridoside. These differences may be related to light and shade photosynthetic strategies, which lead to different storage accumulation.

Low-molecular-mass carbohydrates and soluble polysaccharides of green and red morphs of Gracilaria domingensis (Gracilariales, Rhodophyta)