Abstract Detail

Population Genetics/Genomics

Thapa, Ramhari [1], Bayer, Randall [2], Mandel, Jennifer [3].

Genetic Diversity, Population Structure, and Ancestry Estimation in Antennaria rosea Polyploid Agamic Complex Populations.

Antennaria (Gnaphalieae, Asteraceae) are dioecious perennial herbs distributed mainly in the Holarctic Region with their major center of diversity in the Rocky Mountains of Western North America. The genus comprises 34 known sexual diploid/tetraploid species and at least five polyploid agamic complexes which mostly reproduce by forming asexual seeds. Earlier studies, using morphological data and patterns of isozyme variation, suggested that A. rosea is compilospecies derived from the hybridization and introgression of up to eight sexual diploid/tetraploid Antennaria species. We used microsatellite markers developed for Antennaria species to study the clonal diversity and carry out ancestry estimation of 18 population of A. rosea collected from their major distribution centers in North America. For all eight putative parents of A. rosea, five populations each were used as gene pools in the study. Genetic diversity across A. rosea populations was found to be higher than those of the putative parent populations. Population structure analyses revealed that the A. rosea populations can be subdivided into three genetically distinct clusters. Use of Maximum Likelihood method to estimate the contribution of the eight putative parent’s gene pool to the A. rosea populations indicated that A. rosea have their ancestry mostly derived from the three putative progenitors, A. microphylla (40%), A. umbrinella (27%), and A. marginata (16%). Further studies by sampling more A. rosea and other Antennaria polyploid agamic complex populations may help us better unravel the mysteries of the polyploid agamic complexes in Antennaria and other groups.

1 - University of Memphis, Biological Sciences, 3700 Walker Avenue , Memphis, TN, 38152, USA
2 - PO Box 2280 Campus Postal Station, Memphis, TN, 38152, United States
3 - University Of Memphis, Biological Sciences, 3744 Walker Ave, 339 Ellington Hall, Memphis, TN, 38152, United States

Keywords:
Antennaria rosea
genetic diversity
population genetics
Ancestry estimation.

Presentation Type: Poster
Session: P, Population Genetics/Genomics Posters
Location: Arizona Ballroom/Starr Pass
Date: Monday, July 29th, 2019
Time: 5:30 PM This poster will be presented at 5:30 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: PPG015
Abstract ID:881
Candidate for Awards:None