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Genetic Divergence among Infraspecific Taxa of Sarracenia purpurea
Mary Jo W. Godt and J. L. Hamrick
Vol. 23, No. 4 (Oct. - Dec., 1998), pp. 427-438
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2419375
Page Count: 12
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Allozyme diversity and genetic divergence were estimated for eight populations within Sarracenia purpurea. Two populations of each infraspecific taxon (i.e., subsp. purpurea, and subsp. venosa vars. burkii, montana and venosa) were analyzed. In addition, genetic diversity was estimated in an ex situ collection of var. montana propagated for restoration purposes. Twenty-three allozyme loci were resolved using 14 enzyme systems. Striking genetic differences were found among infraspecific taxa; mean genetic identity among these taxa was 0.80 (SD = 0.07), whereas mean genetic identity between populations within taxa was 0.97 (SD = 0.04). Populations within each subsp. venosa variety clustered on a UPGMA phenogram, as did subsp. purpurea populations. The percentage of total genetic variation found among populations was higher than reported, on average, for outcrossing, insect-pollinated species (Gst = 0.55), indicating significant genetic divergence among populations, most (90%) of which was attributable to differences among infraspecific taxa. Overall genetic diversity was moderate within the S. purpurea complex (Ps = 60.9%, APs = 2.89 and Hes = 0.189). Compared with outcrossing animal-pollinated perennials, however, mean within-population genetic diversity was low (Pp = 23.4%, APp = 2.14, and Hep = 0.055). These genetic results, coupled with morphological differences described within this widespread species, indicate that the infraspecific taxa are genetically distinct entities. The high level of allozyme divergence among the named taxa suggests that taxonomic revision of the complex may be warranted and that the conservation status of the varieties should be evaluated. Finally, because genetic diversity was comparatively low within the ex situ collection of var. montana, the collection should be supplemented with propagules from other var. montana populations in the vicinity of the restoration site.
Systematic Botany © 1998 American Society of Plant Taxonomists