Trillium (Melanthiaceae) is a highly diverse genus in the Southeast and includes many local endemics. Previous studies on Trillium in eastern North America identified significant genetic structure associated with limited seed dispersal and historical landscape barriers. In this study, genetic structure was examined in Trillium cuneatum and T. stamineum across Mississippi and western Alabama to look for further evidence that landscape features influence genetic structure at local scales. DNA sequence variation in the trnL intron and trnL-trnF intergenic region was examined across 12 populations of T. cuneatum and six populations of T. stamineum. Samples of Trillium ludovicianum and Trillium foetidissimum were included for comparison. Five and four haplotypes were discovered in T. cuneatum and T. stamineum, respectively, but most populations were fixed for a single haplotype. Haplotypes from T. cuneatum in southwestern Mississippi were also present in congeneric species. Significant geographic structure was found in both species, and divergent haplotypes found on either side of the Tombigbee and Black Warrior Rivers suggest barriers to gene flow in the study area. Strong population differentiation suggests that seed dispersal is limited in both species. Given the strong degree of genetic structure detected in both species and their preference of mesic forests, it is expected that both species will continue to diverge at local scales.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 78 • No. 2