Phylogenetic analysis and evolution of the genusJuglans (Juglandaceae) as determined from nuclear genome RFLPs

RFLPs were studied in 13Juglans species to determine phylogenetic relationships inJuglans. Allele frequency data were used to generate genetic distance matrices and fragment data were used to generate genetic distances based upon shared-fragments and to perform parsimony analysis. Although similar cluster analyses result from analysing allelic and shared-fragment distance, the two types of distance values displayed variable correspondence with each other. Parsimony analysis produced a tree similar to distance data trees, but with additional phylogenetic resolution agreeing with previous systematic studies. All analyses indicate an ancient origin ofJ. regia, previously considered a recently derived species.