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Abstract Detail

Systematics Section

Vasudevan, Hari [1], Telewski, Frank [2], Marquardt, Paula [3], Willyard, Ann [1].

How genetically distinct are the isolated ponderosa pines of southern Arizona?

We studied isolated populations of ponderosa pines in southern Arizona in relation to the continuously distributed pines of the southern Rockies. Wealso investigated potential hybrid zones between ponderosa pine and Pinus arizonica in the Chiricahuas and on Mt. Lemmon where these two species grow in close proximity and where trees with intermediate morphologies have been reported. Length variation in nuclear and chloroplast multi-locus microsatellites and mitochondrial minisatellites was used to reveal genetic relationships within and among populations. SSRs newly developed for ponderosa pine and an expanded use of mitochondrial haplotypes aided our investigation. Genetic data from biparentally inherited (nuclear), paternally inherited (chloroplast in pines), and maternally inherited (mitochondrial) helped us detect hybridization and determine the direction of gene flow. In current treatments, Pinus ponderosa is defined to cover an enormous range of geographic and morphological variation. In light of our current understanding of genetic relationships, we discuss how the name Pinus brachyptera (published by George Engelmann from collections made by Friedrich Adolph Wislizenus in 1846 near Santa Fe, New Mexico) fits with the name Pinus ponderosa (collected by David Douglas in 1826 near present-day Spokane, Washington).

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1 - Hendrix College, Biology, 1600 Washington Ave, Conway, AR, 72032, USA
2 - Michigan State University, Department of Plant Biology, East Lansing, MI, 48824-1312, USA
3 - USDA Forest Service, Institute for Applied Ecosystem Studies, 5985 Hwy. K., Rhinelander, WI, 54501, USA

species delimitation

Presentation Type: Poster:Posters for Sections
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PSY005
Abstract ID:472

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