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Mycorrhizal compatibility and symbiotic reproduction of Gavilea australis, an endangered terrestrial orchid from south Patagonia

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Abstract

Gavilea australis is a terrestrial orchid endemic from insular south Argentina and Chile. Meeting aspects of mycorrhizal fungi identity and compatibility in this orchid species is essential for propagation and conservation purposes. These knowledge represent also a first approach to elucidate the mycorrhizal specificity of this species. In order to evaluate both the mycorrhizal compatibility and the symbiotic seed germination of G. australis, we isolated and identified its root endophytic fungal strains as well as those from two sympatric species: Gavilea lutea and Codonorchis lessonii. In addition, we tested two other strains isolated from allopatric terrestrial orchid species from central Argentina. All fungal strains formed coilings and pelotons inside protocorms and promoted, at varying degrees, seed germination, and protocorm development until seedlings had two to three leaves. These results suggest a low mycorrhizal specificity of G. australis and contribute to a better knowledge of the biology of this orchid as well as of other sympatric Patagonian orchid species, all of them currently under serious risk of extinction.

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Acknowledgments

We thank Amelia Chemisquy for providing the pictures of Gavilea australis in their natural habitat.

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Authors and Affiliations

  1. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica, CRILAR-CONICET, Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina

    Sebastián Fracchia & Adriana Aranda-Rickert

  2. Instituto de Botánica del Nordeste (CONICET—Consejo Nacional de Investigaciones Científicas y Técnicas), Facultad de Ciencias Agrarias (UNNE—Universidad Nacional del Nordeste), CC 209, 3400, Corrientes, Argentina

    Eduardo Flachsland & Graciela Terada

  3. Instituto de Botánica Darwinion, Labardén 200, San Isidro, B1642HYD, Buenos Aires, Argentina

    Silvana Sede

Authors
  1. Sebastián Fracchia
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  2. Adriana Aranda-Rickert
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  3. Eduardo Flachsland
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  4. Graciela Terada
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  5. Silvana Sede
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Corresponding author

Correspondence to Sebastián Fracchia.

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Fracchia, S., Aranda-Rickert, A., Flachsland, E. et al. Mycorrhizal compatibility and symbiotic reproduction of Gavilea australis, an endangered terrestrial orchid from south Patagonia. Mycorrhiza 24, 627–634 (2014). https://doi.org/10.1007/s00572-014-0579-2

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  • DOI: https://doi.org/10.1007/s00572-014-0579-2

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