DNA sequencing and taxonomy of unusual serrate Juniperus from Mexico; Chloroplast capture and incomplete lineage sorting in J. coahuilensis and allied taxa

摘要

Analysis of nrDNA, petN-psbM, trnS-trnG, trmD-trnT, and tmF-trnL of Juniperus coahuilensisand allied taxa of Mexico found typical J. coahuilensis, as well as individuals with: coahuilensis cp andhybrid ITS; coahuilensis cp and novel ITS sequence (La Pamlla type); novel Blue Fruited cp (blue fruitedtaxon) and coahuilensis ITS; plus Blue Fruited cp and La Parrila ITS. nrDNA data was examined andfound to detect hybridization, chloropla.st capture and incomplete lineage sorting. In addition, a newtaxon was found with Blue Fruited (Blue Fruited) cp and /. martinezii ITS, suggestive of chloroplastcapture. New records of J. saltillensis were confimied from Zacatecas. A new record of J. martineziifrom Durango was also confirmed. Several plants affiliated with eitlier J. martinezii, or J. flacckla werein distinct clades showing the need for additional research on their volatile leaf oils, moiphology andecology to address their taxonomic status. And lastly, a very unusual population of junipers large, singlestemmed trees with aff. J. poblana was found in Nayarit, with long and pendulous foliage. Analysis ofthe leaf volatile oils, ecology and morphology of this taxon is necessary (in progress) to ascertain itstaxonomic rank