Abstract
Three populations of the brown seaweed Canistrocarpus cervicornis along 1800 km of the southwestern Atlantic coast were studied. Phylogenetic analysis based on the plastid and mitochondrial genes rbcL and nad1, respectively, confirmed that these populations were composed of the same taxon. Crude ethyl acetate extracts were analysed by gas chromatography coupled to a mass spectrometer (GC/MS), which revealed 13 detectable products whose fragment patterns were compatible with those expected for diterpenes. The analysis of fragment patterns identified the diterpenoid 4,7-diacetoxy-14-hydroxydolastane-1 (15), 8-diene as the major product in all the populations. Furthermore, the concentration of this diterpenoid and other products were highly variable among the three populations. However, this plasticity was not observed in sample morphology, which was generally conserved among the populations. Therefore, GC/MS enabled the detection of differences in diterpene chemodiversity within geographically distinct populations of C. cervicornis, and even though natural product abundance varied greatly, molecular markers and morphology were highly conserved.
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Acknowledgments
The authors thank Roberta Pacheco Silva and Samara Ribeiro da Silva for their help in the molecular biology laboratory, Dr. Silvia Mattos Nascimento for the comments that improved our manuscript, and the Program for Technological Development in Tools for Health-PDTISFIOCRUZ (Fundação Oswaldo Cruz) for use of its facilities. This work was supported by the Fundação Carlos Chagas Filho de Apoio à Pesquisa do Estado do Rio de Janeiro (BIOTA 2012 – FAPERJ E-26/111.397/2012) and a Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) scholarship to JMA.
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de Araujo, J.M., Tappin, M.R.R., da Rocha Fortes, R. et al. Chemodiversity of the brown algae Canistrocarpus cervicornis (Dictyotaceae, Phaeophyceae) in tropical and subtropical populations along the southwestern Atlantic coast of Brazil. J Appl Phycol 30, 611–618 (2018). https://doi.org/10.1007/s10811-017-1249-5
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DOI: https://doi.org/10.1007/s10811-017-1249-5