Anais CBFic - Volume 1 - 2018

Sociedade Brasileira de Ficologia - SBFic

Publicado em 26/11/2018

Volume 1 - 2019

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

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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.