Geographic patterns of genetic variation in native pecans |
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Authors: | L J Grauke Maria Azucena Mendoza-Herrera Allison J Miller Bruce W Wood |
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Institution: | (1) USDA ARS Pecan Breeding and Genetics, 10200 FM 50, Somerville, TX 77879, USA;(2) Norman Borlaug Center for Southern Crop Improvement, Texas A&M University, College Station, TX 77843-2123, USA;(3) Department of Biology, Saint Louis University, 3507 Laclede Ave, St. Louis, MO 63103, USA;(4) USDA ARS Southeastern Fruit and Tree Nut Research Lab, 21 Dunbar Road, Byron, GA 31008, USA |
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Abstract: | A structured collection of 80 seedling pecan trees Carya illinoinensis (Wangenh.) K. Koch], representing 19 putatively native pecan populations across the species range, was evaluated at three
plastid and 14 nuclear microsatellite (simple sequence repeat, SSR) loci. Data were analyzed using a priori population designations
and also within a Bayesian framework, in which individuals were assigned to clusters regardless of population of origin. Population
genetic analyses using a priori populations, clusters based on chloroplast microsatellite data (cpSSR), and clusters based
on nuclear microsatellite data (nSSR) yielded consistent results. For all groupings, cpSSR variation exhibited more geographic
structure than the nSSR data. Furthermore, cpSSR microsatellite diversity decreased with increasing latitude, but this pattern
was not observed with the nuclear data. Contrasting patterns in plastid and nuclear genetic diversity demonstrate unique aspects
of postglacial recolonization reflected in the movement of seeds versus pollen. These data suggest that plastid SSRs are useful
tools for identifying population structure in pecan and hold promise for ongoing efforts to identify and conserve representative
germplasm in ex situ collections. |
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