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Abstract Detail


Recent Topics Posters

Flores-Renteria, Lluvia [1], Gernandt, David S. [2], Pinero, Daniel [1], Dominguez, César [1].

Phylogenetic relationships among Pinus discolor, P. johannis, and P. culminicola (subsection Cembroides).

Pinus discolor, the border pinyon, is a small tree distributed in the Madrean sky islands of the southwestern United States, and the Sierra Madre Occidental and the southern Sierra Madre Oriental of Mexico. Its taxonomic status is controversial; it has been treated as a valid species, or synonymized with its probable sister taxon from the Sierra Madre Oriental, P. johannis. Alternatively, both have been treated as P. cembroides var. bicolor or as P. culminicola vars. discolor and johannis. Morphological and monoterpene differences have been described for P. discolor and P. johannis, but the characters exhibit much variation and overlap, leaving it uncertain whether the two taxa correspond to evolutionarily separate entities. Previous chloroplast DNA phylogenies have recovered a polytomy for P. discolor, P. johannis and P. culminicola. To further investigate the phylogenetic relationships among these species we sequenced chloroplast DNA from trnH-psbA, and matK within the pinyon pines (Pinus subsection Cembroides). For P. discolor, P. johannis and P. culminicola, we included individuals from across their distributional range. One individual was included for the remaining species and varieties of subsection Cembroides. We found multiple cpDNA haplotypes for P. johannis, P. discolor and P. culminicola, several of which were shared among all three taxa. Parsimony analysis only partially resolved their haplotype relationships, but they were clearly separated from P. cembroides, which in turn showed much lower levels of cpDNA diversity, even among infraspecific taxa. Traditional characters that support grouping P. johannis and P. discolor with P. culminicola and separate from P. cembroides include the absence of stomata on the abaxial leaf face and a white rather than pink megagametophyte. Efforts are underway to increase the resolution of the cpDNA tree and to better characterize morphological differences for these pines.


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1 - Universidad Nacional Autonoma de Mexico, Instituto de Ecología, Departamento de Ecología Evolutiva, Apartado Postal 70-275, Mexico, D.F., 04510, Mexico
2 - Universidad Nacional Autónoma de México, Instituto de Biología, Departamento de Botanica, Apartado Postal 70-233, Mexico, D.F., 04510, Mexico

Keywords:
Species
cpDNA
Pinus
phylogeny.

Presentation Type: Recent Topics Poster
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P79046
Abstract ID:2726


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