Natural hybridization among subspecies of turnera sidoides l. (passifloraceae) revealed by morphological and genetic evidence
Fecha
2015Autor
Moreno, Ercilia María Sara
Speranza, Pablo Rafael
Roggero Luque, Juan Manuel
Solís Neffa, Viviana Griselda
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Turnera sidoides is a complex of outcrossing, perennial, rhizomatous herbs that is widely distributed in southern South America. Five subspecies are recognized
taxonomically based on morphological features and geographical distribution. In certain regions, the areas of distribution of the subspecies overlap partially. In such contact zones, the extent of reproductive barriers among subspecies is still largely unknown, but morphologically intermediate individuals have been found in the field, indicating that hybridization may actually occur between subspecies. Crossability among subspecies of T. sidoides has been shown by experimental studies with cultivated plants, but the mechanisms involved in natural populations are still
unknown. To investigate the mechanisms that underlie
gene flow within the T. sidoides complex, in this paper we analyze the morphological and genetic variation, as well as the crossability among taxa in a contact zone between
subspecies pinnatifida and sidoides, in southeastern Uruguay. Our results constitute the first evidences of ongoing
natural hybridization between subspecies of T. sidoides and suggest that, although hybridization may not have been of significance in the early phase of the species differentiation, reticulate evolution is ongoing enhancing the current morphological and genetic variability of the complex.
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