Evidencia morfológica e isoenzimática de hibridación natural entre Nothofagus antarctica y N. pumilio en el noroeste Patagónico

QUIROGA MP, R VIDAL RUSSEL, A PREMOLI

BOSQUE (VALDIVIA)

Lugar: Valdivia, Chile; Año: 2005 vol. 26 p. 25 - 32

0304-8799

We studied the possible hybridization between N. pumilio and N. antarctica by analyzingmorphological and isozyme characteristics of a high altitude population at Laguna Negra innorthwestern Patagonia, Argentina. Samples collected from this population formorphological and genetic analyses were compared to pure populations of N. pumilio andN. antarctica. Pure species were statistically different from each other in leafcharacteristics. A multivariate analysis indicated greater similarity between the hybrids andN. antarctica. Polymorphism at Laguna Negra for 13 loci was 61% which was higher thanthat for N. antarctica and N. pumilio (58 and 43%, respectively). We found diagnosticalleles of each pure species and the hybrids resulted similar to N. antarctica. These resultsindicate that natural hybridization between N. antarctica and N. pumilio, and introgressioninto N. antarctica take place in Laguna Negra.