Wallace, Christina L. , Harris, Megan L. , Glennon, Kelsey , Hunter, Richard , Hunter, Kimberly .
ISSR investigations of natural occurring hybrids of Larrea (Zygophyllaceae) in South America.
Larrea is a small, recently evolved plant genus that dominates the warm deserts of South and North America. There are four species in South America (L. divaricata, L. cuneifolia, L. nitida and L. ameghinoi) and one species in North America (L. tridentata). This genus has interested scientists since the 1800's primarily due to the amphitropical disjunction and dominance of the genus in the Americas. Hybridization in Larrea has been intensively studied at one site in the Rio Negro Province of Argentina where the four species come into contact. Using ISSR markers multiple hybrid zones were examined in western and eastern Argentina. Parental species have been compared from across their range to the hybrid samples. Neighbor-joining analyses of the ISSR data show the species largely form distinct groups, and that the hybrids cluster together. Heterozygosity values are consistently higher for each putative parent than the respective hybrid.
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1 - Salisbury University, Department of Biology, 1101 Camden Avenue, Salisbury, Maryland, 21801, USA
Presentation Type: Poster
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM