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Deviations in the life-history of Gracilaria sp. (Rhodophyta, Gigartinales), from Coquimbo, Chile, under different culture conditions

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Abstract

Cystocarpic branches of a species of Gracilaria from Coquimbo, Chile, were cultured in vitro. A Polysiphonia-like life history was completed in about 6 months, but some ‘abnormalities’ were observed: i. carpospores gave rise to plants producing either tetrasporangia and spermatangia, or tetrasporangia only; ii. tetraspores cultured without aeration developed into plants bearing spermatangia only; tetraspores cultured with aeration developed into 1:1 female and male gametophytes; iii. plant originated from tetraspore produced spermatangia and tetrasporangia; one of these tetraspores developed into a male gametophyte; iv. some tetraspores gave rise to spherical bodies instead of the ordinary cylindrical branches; one of them bore spermatangia after three months. The results show that environmental factors seem to be interfering with the mechanism of sex determination and induce the development of spermatangia on putative female gametophytes, or on putative tetrasporophytes.

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Authors and Affiliations

  1. Instituto de Biociências and CEBIMar, Universidade de São Paulo, Caixa Postal 11461, São Paulo, Brazil

    Estela M. Plastino & Eurico C. de Oliveira F°

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  1. Estela M. Plastino
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  2. Eurico C. de Oliveira F°
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Additional information

Noted added in proof: The Gracilaria sp. studied here was recently described as a new species, G. chilensis by Bird C. J., McLachlan, J & Oliveira, E. C. de, 1986. Can. J. Bot. 64: 2928–2934.

Noted added in proof: The Gracilaria sp. studied here was recently described as a new species, G. chilensis by Bird C. J., McLachlan, J & Oliveira, E. C. de, 1986. Can. J. Bot. 64: 2928–2934.

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Plastino, E.M., de Oliveira F°, E.C. Deviations in the life-history of Gracilaria sp. (Rhodophyta, Gigartinales), from Coquimbo, Chile, under different culture conditions. Hydrobiologia 164, 67–74 (1988). https://doi.org/10.1007/BF00014350

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  • DOI: https://doi.org/10.1007/BF00014350

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