Allopatric hybridization and introgression between Juniperus maritima R. P. Adams and J. scopulorum Sarg: Evidence from nuclear and cpDNA and leaf terpenoids
Adams RP. 2015. Allopatric hybridization and introgression between Juniperus maritima R. P. Adams and J. scopulorum Sarg: Evidence from nuclear and cpDNA and leaf terpenoids. Phytologia. 97(1):55-66
Previous studies of leaf terpenoid variation from throughout the range of Juniperus scopulorum found the populations in Wallowa, OR and British Columbia (northern Rocky Mountains) were differentiated from the central Rocky Mountain populations. Re-assessment of that data in concert with the leaf essential oil of J. maritima, suggest the 'divergent' populations at Wallowa and British Columbia are in fact hybrids and/or introgressants. New data from nrDNA (ITS), maldehy, and petN-psbM (cpDNA) confirm that allopatric hybridization is occurring at Wallowa, eastern WA, and southeastern BC into w Montana. nrDNA was found to be of less use in detecting hybrids than a single copy nuclear gene (SCN), maldehy. This appears to be due to concerted evolution in nrDNA. The uniform presence of either J. maritima cpDNA in western BC and WA or J. scopulorum cpDNA in eastern BC, WA, OR, and MT suggests allopatric introgression by air-borne pollen.
- Type
- Journal Article
- Authors
- Adams, Robert
- Units
- OLYM
- Keywords
- DNA analysis, Hybridization, Juniperus maritima, Juniperus scopulorum, leaf terpenoids, Pleistocene refugia