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Intraspecific diversity of the gracilarioid algae (Gracilariales, Rhodophyta)

Grant number: 10/50175-3
Support Opportunities:BIOTA-FAPESP Program - Regular Research Grants
Duration: October 01, 2010 - September 30, 2013
Field of knowledge:Biological Sciences - Botany
Principal Investigator:Estela Maria Plastino
Grantee:Estela Maria Plastino
Host Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The strain selection in seaweeds is a recent activity and it is restricted to oriental countries. In Brazil, many attempts of mariculture have failed; one of the reasons would be the absence of previous studies in laboratory. Recent approaches that include strain selection in gracilarioid algae (Gracilariales, Rhodophyta) in the Laboratório de Algas Marinhas (IBUSP) have shown promising results and can contribute to agarophyte mariculture. In this project, we will focus on two species: Gracilaria birdiae and G. caudata. Strains of G. birdiae have already shown satisfactory performance in laboratory and at sea (Ubatuba, SP); however, they have never been evaluated in localities where its populations occur (Northeastern Brazil). We intend to study the potential of strain cultivation at sea for future mariculture projects that will benefit communities and promote a better utilization of this economic resource. Moreover, we intend to evaluate the population dynamics. Other approaches will employ laboratory culture techniques in G. caudata for the analysis of intraspecific diversity caused by intrinsic characteristics in many rhodophythes that, although with a triphase life-history, show two isomorphic phases, haploid and diploid, that are present in the same population. Moreover, these studies will produce results about the occurrence of ecotypes in this species, since we intend to evaluate individuals from two populations in regions 20° of latitude apart. The integration of this information will allow interpretations about the adaptive advantages in maintaining haplo-diploid history cycles and will enable strain selection that will be utilized in practical applications. (AU)

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Scientific publications (8)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FARIA, ANDRE V. F.; BONOMI-BARUFI, JOSE; PLASTINO, ESTELA M.. Ecotypes of Gracilaria caudata (Gracilariales, Rhodophyta): physiological and morphological approaches considering life history phases. JOURNAL OF APPLIED PHYCOLOGY, v. 29, n. 2, p. 707-719, . (10/50175-3)
FARIA, ANDRE V. F.; PLASTINO, ESTELA M.. Physiological assessment of the mariculture potential of a Gracilaria caudata (Gracilariales, Rhodophyta) variant. JOURNAL OF APPLIED PHYCOLOGY, v. 28, n. 4, p. 2445-2452, . (10/50175-3)
ARAUJO, F. O.; URSI, S.; PLASTINO, E. M.. Intraspecific variation in Gracilaria caudata (Gracilariales, Rhodophyta): growth, pigment content, and photosynthesis. JOURNAL OF APPLIED PHYCOLOGY, v. 26, n. 2, p. 849-858, . (10/50175-3)
AYRES-OSTROCK, L. M.; MAUGER, S.; PLASTINO, E. M.; OLIVEIRA, M. C.; VALERO, M.; DESTOMBE, C.. Development and characterization of microsatellite markers in two agarophyte species, Gracilaria birdiae and Gracilaria caudata (Gracilariaceae, Rhodophyta), using next-generation sequencing. JOURNAL OF APPLIED PHYCOLOGY, v. 28, n. 1, p. 653-662, . (11/10189-8, 10/50175-3)
MARCHI, FABIANA; PLASTINO, ESTELA M.. Codominant inheritance of polymorphic color mutant and characterization of a bisexual mutant ofGracilaria caudata(Gracilariales, Rhodophyta). JOURNAL OF APPLIED PHYCOLOGY, v. 32, n. 6, p. 4385-4398, . (10/50175-3)
AYRES-OSTROCK, LIGIA M.; VALERO, MYRIAM; MANGER, STEPHANE; OLIVEIRA, MARIANA C.; PLASTINO, ESTELA M.; GUILLEMIN, MARIE-LAURE; DESTOMBE, CHRISTOPHE. Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata. JOURNAL OF PHYCOLOGY, v. 55, n. 5, . (10/50175-3, 11/10189-8)

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