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Phenetic Analysis and the Phylogeny of the Diploid Species of Gossypium L. (Malvaceae)
Paul A. Fryxell
Vol. 25, No. 3 (Sep., 1971), pp. 554-562
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2407355
Page Count: 9
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The Wagner Divergence Index was used to evaluate phylogenetic patterns of the diploid species of Gossypium. This phenetic analysis was compared with previously proposed phylogenetic schemes for the genus that have largely been based on evidence from chromosome pairing of interspecific hybrids. The two approaches agree in broad outline but differ in certain particulars. Discussion was also devoted to the significance of data derived from the electrophoretic analysis of seed proteins of Gossypium spp. The most notable discrepancies concern the Australian species, which, in the phenetic analysis, fall into three widely divergent lineages. Previous studies, however, have generally grouped them monophyletically. A discussion of the strong and weak points of the two approaches concludes that the cytogenetic approach is less likely to be misled by parallel and convergent evolutionary patterns, but tends to overestimate the strength of species affinity. Phenetic analysis, on the other hand, has complementary qualities and presents a truer picture of species affinity, but it is capable of being misled by parallelism.
Evolution © 1971 Society for the Study of Evolution