Comparative study of the sympatric ferns Culcita macrocarpa and Woodwardia radicans: Sexual phenotype |
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Authors: | Luis G Quintanilla Emilia Pangua Javier Amigo Santiago Pajarn |
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Institution: | aDepartamento de Matemáticas y Física Aplicadas y Ciencias de la Naturaleza, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, E-28933 Móstoles, Spain;bFacultad de Biología, Universidad Complutense, Madrid, Spain;cFacultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain |
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Abstract: | The sexual phenotypes of 1152 gametophytes from four populations of Culcita macrocarpa and Woodwardia radicans were monitored over a 1-year period. Gametophytes were maintained under three experimental conditions: (1) isolated, (2) pairs from the same sporophyte, or (3) pairs from different sporophytes. The frequencies of the sexual phenotypes did not vary significantly among these three conditions, and although there were some quantitative differences between populations, the sexual-phenotype sequences observed were species-specific. Gametophytes of C. macrocarpa were first male and then hermaphrodite: this sequence, together with the absence of antheridiogens, favours intragametophytic selfing. Natural populations of C. macrocarpa are presumably androdioecious. Gametophytes of W. radicans were first female and then hermaphrodite: this sequence and antheridiogen activity favour intergametophytic and even xenogamous mating. Despite these laboratory findings, populations of W. radicans are probably trioecious (because of the effects of antheridiogen). Few sporophytes of W. radicans were obtained in the present study, and none of C. macrocarpa: this is attributable to limiting illumination or substrate. |
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Keywords: | Antheridiogen Breeding system Homosporous fern Dichogamy Sexual phenotype Spain |
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