Skip to Main Content
Genetic homogeneity in Juglans nigra(Juglanaceae) at nuclear microsatellitesAuthor(s): Erin R. Victory; Jeffrey C. Glaubitz; Olin E., Jr. Rhodes; Keith E. Woeste
Source: American Journal of Botany 93(1):118-126.
Publication Series: Scientific Journal (JRNL)
Station: North Central Research Station
PDF: Download Publication (119.42 KB)
DescriptionBroad-scale studies of genetic structure and diversity are indicative of the recent evolutionary history of a species and are relevant to conservation efforts. We have estimated current levels of genetic diversity and population structure for black walnut (Juglans nigra L.), a highly valuable timber species, in the central hardwood region of the United States. Black walnut trees from 43 populations across this region were genotyped at 12 highly polymorphic microsatellite loci. Genetic diversity was high and populations only slightly deviated from Hardy-Weinberg proportions (FIS= 0.017). Considering the scale of our sampling, the species was remarkably genetically homogenous: FST was quite low (0.017), and in a Bayesian analysis the optimal higher-order partition was into a single group comprised of all 43 populations. Although black walnut is predominantly a bottomland species, very little genetic variance was partitioned among broad-scale hydrologic regions (FPT= 0.002). However, a weak, but statistically significant pattern of isolation by distance was detected. The results are consistent with a scenario in which black walnut recolonized its current range from a single glacial refugium, and where subsequent genetic effects associated with deforestation and habitat fragmentation have been mitigated by high levels of pollen flow. Nuclear microsatellites alone may be insufficient to identify hotspots for black walnut conservation.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationVictory, Erin R.; Glaubitz, Jeffrey C.; Rhodes, Olin E., Jr.; Woeste, Keith E. 2006. Genetic homogeneity in Juglans nigra(Juglanaceae) at nuclear microsatellites. American Journal of Botany 93(1):118-126.
KeywordsBlack walnut, central hardwood region, genetic distance, Juglandaceae, microsatellites, Midwestern flora
- Different histories but similar genetic diversity and structure for black walnut in Indiana and Missouri
- Designing specific chloroplast markers for black walnut from a set of universal primers
- The genetic effects of a diameter limited cut on black walnut
XML: View XML