Abstract Detail

Biogeography

Barfield, Keri [1], Williams, Dean [2], Kroh, Glenn [3].

Phylogeographic study of Pinus ponderosa & P. jeffreyi.

Pinus jeffreyi (Grev. & Balf.) is a high elevation pine found from Oregon to northern Baja California in Mexico. This species is morphologically similar to Pinus ponderosa (Douglas ex P. Lawson & C. Lawson) which occurs at lower elevations, although some molecular and biochemistry work have placed P. jeffreyi in the Sabinianae group rather than the Ponderosae group. P. jeffreyi and P. ponderosa often come into contact at the margins of these species distributions and there is some morphological and molecular evidence for introgression between these species. We sampled P. jeffreyi throughout much of its range as well as nearby P. ponderosa var. ponderosa and a few distant P. ponderosa var. scolpulorum populations. Samples were sequenced at the chloroplast (cpDNA) rpl132F - trnL(UAG) and sized at a repetitive region in the mitochondrial (mtDNA) Nad1 region to compare population genetic structure and determine if there is evidence for hybridization between these taxa. For both species, variation at mtDNA was higher between populations than variation at the cpDNA locus consistent with inheritance patterns in Pinus. P. jeffreyi exhibited stronger population differentiation at both cpDNA and mtDNA loci than P. ponderosa. Genetic diversity was also lower for P. jeffreyi than the two P. ponderosa varieties consistent with its more limited geographic range. Some cpDNA haplotypes were widely shared between P. jeffreyi and P. ponderosa var. ponderosa but none were shared with the more distant P. ponderosa var. scolpulorum populations. One mtDNA haplotype was shared between all three taxa while one was shared between the two Ponderosa varieties and one was shared between P. jeffreyi and P. ponderosa var. ponderosa. Our results suggest P. jeffreyi and P. ponderosa var. ponderosa may often hybridize and could potentially be an important source of genetic diversity for P. jeffreyi.

1 - Botanical Research Institute of Texas, Fort Worth, TX, 76107, USA
2 - Texas Christian University, 2800 S. University Dr, Fort Worth, TX, 76129, USA
3 - Texas Christian University, Biology, 2800 S. University Drive, Fort Worth, TX, 76129, USA

Keywords:
biogeography
pine
California.

Presentation Type: Poster
Session: P, Biogeography
Location: Exhibit Hall/Omni Hotel
Date: Monday, June 26th, 2017
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PBG006
Abstract ID:451
Candidate for Awards:None