Effects of extracts and isolated molecules of two species of Gracilaria (Gracilariales, Rhodophyta) on early growth of lettuce

Autor(es)

Torres, Priscila ^[1] ; Novaes, Paula ^[1] ; Ferreira, Luciana Garcia ^[2] ; Santos, Janaina Pires ^[3] ; Mazepa, Ester ^[2] ; Duarte, Maria Eugenia R. ^[2] ; Noseda, Miguel D. ^[2] ; Chow, Fungyi ^[3] ; dos Santos, Deborah Y. A. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biosci, Dept Bot, Phytochem Lab, Sao Paulo, SP - Brazil

^[2] Univ Fed Parana, Dept Biochem & Mol Biol, Carbohydrate Chem Div, Curitiba, PR - Brazil

^[3] Univ Sao Paulo, Inst Biosci, Dept Bot, Lab Marine Algae Edison Jose de Paula, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS; v. 32, p. 142-149, JUN 2018.
• Citações Web of Science: 2

Resumo

Crude extracts using hexane, dichloromethane, methanol, 80% methanol or water of two agarophytes (Gracilaria caudata and Gracilaria domingensis) and their phase partitions were evaluated on early growth of lettuce. Hexane, methanol, 80% methanol and aqueous extracts of G. caudata and dichloromethane and aqueous extracts of G. domingensis were biostimulants. Palmitic acid, the major compound of non-polar extracts and phase partition, showed a significant stimulant activity in the concentrations tested (ranging from 0.49mM to 1.95 mM), increasing 83% of lettuce root length, comparing to control, at the highest concentration. The promoting effect of the aqueous extracts is probably related to the presence of agaran, a typical hydrocolloid polysaccharide from red algae, which is mostly an exclusive constituent of these extracts. The agarans of G. domingensis and G. caudata promoted an increase in lettuce root length of 60% and 40%, respectively (both at 1 mg.mL(-1) of extract). Differences in the effects promoted by these two agarans are probably related to the different content of sulfate groups (higher for polysaccharide from G. domingensis). These results suggest that structural features of agaran-type polysaccharides can elicit distinct responses. To the best of our knowledge, this is the first report on the identification of compounds with biostimulating potential from Gracilaria. (AU)

• Processo FAPESP: 13/50731-1 - Biodiversidade fisiológica e química de macroalgas ecológica e economicamente importantes
• Beneficiário: Fanly Fungyi Chow Ho
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 13/07543-0 - Atividades pesticida de acetogeninas de espécies de Annonaceae nativas do Cerrado
• Beneficiário: Déborah Yara Alves Cursino dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular