The use of in vitro culture to improve the propagation of Rhododendron ponticum subsp. baeticum (Boiss. & Reuter) |
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Authors: | Manuel Cantos Juana Linán José L García María García-Linán Miguel A Domínguez Antonio Troncoso |
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Institution: | (1) Instituto de Recursos Naturales y Agrobiología (CSIC), 41080 Sevilla, Spain |
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Abstract: | Rhododendron ponticum subsp. baeticum is endemic in the southern region of the Iberian Peninsula. The relict populations of this species are vulnerable, due mainly
to difficult conditions for the establishment of seedlings, resulting in a virtual lack of sexual recruitment. In order to
preserve the surviving populations, in vitro culture methods have been applied for both the sexual and the agamic propagation of the species. The in vitro germination of seeds was high when conducted with Anderson’s medium without plant growth regulators. The self-rooted seedlings
obtained were easily transplanted to outside conditions. The presence of growth regulators in the medium interfered with the
development of the seedlings, causing heavy callus formation. The in vitro growth of explants took place readily in Anderson’s medium plus 0.072 mg L−1 of BA and 0.036 mg L−1 of NAA although the explants did not form roots. Rooting was achieved by the basal dipping of the explants in hydroalcoholic
solutions of 500 mg L−1 IAA during the outside transplanting process. Therefore, the combination of in vitro grown explants together with ex vitro rooting, results in a good method for the agamic propagation of Rhododendron ponticum subsp. baeticum. |
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Keywords: | Rhododendron ponticum subsp baeticum in vitro culture endangered species seed germination rooting propagation |
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