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

2007; De Gruyter; Volume: 50; Issue: 5-6 Linguagem: Inglês

10.1515/bot.2007.036

1437-4323

Melina Guimarães, Adriano Gonçalves Viana, Maria Eugênia R. Duarte, Sérgio Donizeti Ascêncio, Estela M. Plastino, Miguel D. Noseda,

Algal biology and biofuel production

Abstract 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.