NDLI: Post-glacial evolution of Panicum virgatum: centers of diversity and gene pools revealed by SSR markers and cpDNA sequences

Content Provider	Springer Nature Link
Author	Zhang, Yunwei Zalapa, Juan E. Jakubowski, Andrew R. Price, David L. Acharya, Ananta Wei, Yanling Brummer, E. Charles Kaeppler, Shawn M. Casler, Michael D.
Copyright Year	2011
Abstract	Switchgrass (Panicum virgatum), a central and Eastern USA native, is highly valued as a component in tallgrass prairie and savanna restoration and conservation projects and a potential bioenergy feedstock. The purpose of this study was to identify regional diversity, gene pools, and centers-of-diversity of switchgrass to gain an understanding of its post-glacial evolution and to identify both the geographic range and potential overlap between functional gene pools. We sampled a total of 384 genotypes from 49 accessions that included the three main taxonomic groups of switchgrass (lowland 4x, upland 4x, and upland 8x) along with one accession possessing an intermediate phenotype. We identified primary centers of diversity for switchgrass in the eastern and western Gulf Coast regions. Migration, drift, and selection have led to adaptive radiation in switchgrass, creating regional gene pools within each of the main taxa. We estimate that both upland-lowland divergence and 4x-to-8x polyploidization within switchgrass began approximately 1.5–1 M ybp and that subsequent ice age cycles have resulted in gene flow between ecotype lineages and between ploidy levels. Gene flow has resulted in “hot spots” of genetic diversity in the southeastern USA and along the Atlantic Seaboard.
Starting Page	933
Ending Page	948
Page Count	16
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	139
Issue Number	7
e-ISSN	15736857
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-07-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Switchgrass DNA markers Genetic diversity Genetic structure Post-glacial migration Plant Genetics & Genomics Human Genetics Life Sciences Microbial Genetics and Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Animal Science and Zoology Insect Science

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Post-glacial evolution of Panicum virgatum: centers of diversity and gene pools revealed by SSR markers and cpDNA sequences