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Epi-endophytic symbiosis between Laminariocolax aecidioides (Ectocarpales, Phaeophyceae) and Undaria pinnatifida (Laminariales, Phaeophyceae) growing on Argentinian coasts

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Abstract

The present is the first study on epi-endophytic algae on thalli of Undaria pinnatifida growing along Argentinian coasts. The main goal is to describe the nature and the morphology of this symbiosis. Individuals of Laminariocolax aecidioides were detected in both June and December 2004, growing on U. pinnatifida sporophytes. In nature, the epi-endophyte were macroscopically observed as dark zones that partially covered the hosts’ fronds. L. aecidioides vegetative thalli were irregularly branched uniseriate filaments. The life cycle is described from laboratory cultures started from Patagonian populations. Caryology revealed that the sporophytic diploid phase presented 16 chromosomes whereas the gametophytic haploid phase presented 8 chromosomes. Isolates made from thalli growing in the interior of infected hosts developed into filamentous, branched sporophytes that reproduced by both unispores and plurispores that were produced in unilocular and plurilocular sporangia, respectively. The results of this paper also allowed us to conclude that L. aecidioides uses the thalli of U. pinnatifida as a proper substrate. The penetration of endophitic filaments among the host´s cortical cells produced a lateral compression and, finally, their thalli development generated perforations in the host tissues. The effects of the epi-endophytic infection of L. aecidioides on U. pinnatifida are neither severe nor deleterious.

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Acknowledgements

M.C.G. has a fellowship of the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET). E.R.P. is Research Member of the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET). E.J.C. is Research Member of the Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, República Argentina (CIC). The Secretary of Science and Technology of the Universidad Nacional del Sur provided funds by grant PGI CSU-24 B/119 to E.R.P.

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  1. Laboratorio de Ecología Acuática, Universidad Nacional del Sur-Instituto Argentino de Oceanografía (CONICET), 8000, Bahía Blanca, Argentina

    M. Cecilia Gauna & Elisa R. Parodi

  2. Laboratorio de Ficología y Micología, Universidad Nacional del Sur, CIC. 8000, Bahía Blanca, Argentina

    Eduardo J. Cáceres

  3. Laboratorio de Ficología, Instituto de Argentino de Oceanografía (I.A.D.O.), Camino Carrindanga Km 7,5, 8000, Bahía Blanca, Argentina

    M. Cecilia Gauna

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  1. M. Cecilia Gauna
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Correspondence to M. Cecilia Gauna.

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Gauna, M.C., Parodi, E.R. & Cáceres, E.J. Epi-endophytic symbiosis between Laminariocolax aecidioides (Ectocarpales, Phaeophyceae) and Undaria pinnatifida (Laminariales, Phaeophyceae) growing on Argentinian coasts. J Appl Phycol 21, 11–18 (2009). https://doi.org/10.1007/s10811-007-9298-9

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