Título do Trabalho
COMPARISON OF PRIMARY METABOLITES BETWEEN ENDEMIC AND NON-ENDEMIC ANTARCTIC RED ALGAE
Autores
CESAR BERTAGIA PASQUALETTI, MARIA ANGELA MACHADO DE CARALHO, PIO COLEPICOLO, NAIR SUMIE YOKOYA
Modalidade
Resumo
Área Temática
1 BIODIVERSIDADE, FILOGENIA E ECOFISIOLOGIA
Data de Publicação
26/11/2018
País da Publicação
Brasil
Idioma da Publicação
Português
Página do Trabalho
http://sbfic.org.br/anais_show/143
ISSN
Aguardando...
Palavras-Chave
Curdiea racovitzae, Iridaea cordata, proteins, pigments, carbohydrates, Antarctica
Resumo
To survive in extreme conditions, the benthic marine macroalgae from Antarctica require biochemical and physiological strategies. Studies on species of Rhodophyta have shown that the quantity and quality of pigments vary according to the life history stages and geographic regions. These factors also influence the quality of compounds of economic interest, such as agar and carrageenan, which are wall polysaccharides produced by red algae. However, little is known about the interaction among metabolites, mainly carbohydrate metabolism of species subjected to these extreme climatic conditions. Therefore, this study aimed to analyze the contents of pigments, soluble proteins and carbohydrates at fertile and non-fertile stages of the Antarctic endemic species Curdiea racovitzae Hariot and non-endemic species Iridaea cordata (Turner) Bory de Saint-Vincent collected in a latitudinal gradient at Antarctic region. I. cordata showed higher concentrations of phycobilins (varying from 0.49±0.14 to 4.3±1.1 mg g-1 DW), than C. racovitzae (from 0.2±0.09 to 0.84±0.13 mg g-1 DW). However, the Antarctic endemic species showed higher concentrations of soluble proteins and floridean starch (from 2.64±0.85 to 26.2±4.5 mg g-1 DW and from 113.3±37.85 to 372.12±16.05 mg g-1 DW, respectively) than I. cordata (from 0.43±0.1 to 3.33±0.67 mg g-1 DW and 2.42±0.83 to 206.38±49.38 mg g-1 DW). The floridean starch concentration is higher in fertile than non-fertile plants, for the both species. The low molecular weight carbohydrate (LMWC) concentration was higher in C. racovitzae (from 19.33±4.1 to 46.19±6.57 mg g-1 DW) than in I. cordata (from 7.18±1.3 to 17.36±6.25 mg g-1 DW). In addition, high concentrations of LMWC were found in fertile plants from the high latitude and in non-fertile plants from the collecting sites with low latitudes. I. cordata had the highest concentrations of polysaccharides (from 2.89±0.33 to 29.95±4.76 mg g-1 DW), which presented higher levels of 3,6 anhydrogalactose (from 2.89±0.33 to 29.95±4.76 mg g-1 DW) and sulfate (from 21.4±2.49 to 45.72±5.38 mg g-1 DW) than the polysaccharides from C. racovitzae (from 2.93±0.15 to 6.55±1.03 mg g-1 DW). Polysacharides from non-fertile I. cordata presented higher sulfate levels than the fertile plants. Therefore, the highest floridean starch concentration in the fertile plants and higher concentration of phycobilins in the non-fertile plants for both species could be related with the metabolism of each reproductive phase.
