Zavada, Tomas , Malik, Rondy , Kesseli, Rick .
200 years of evolutionary change - the use of herbarium specimens to reconstruct patterns of genetic variation in the nonindigenous species Cichorium intybus in New England.
The current flora of New England consists of both native and non-native species. Nonindigenous plants have been introduced since first Europeans landed in North America in the 15th century. Cichorium intybus (chicory) represents a model of wild-weedy-domesticated species, owing its genetic variety to the outcrossing nature. The first record of planting chicory in the U.S. can be found in Thomas Jefferson's 1774 correspondence. The future success of this species in colonizing the United States was indicated in Jefferson' s 1811 letter "...[Sichorium Intibus] has been growing here in abundance and perfection now 20 years without any cultivation after the first transplanting". The current populations of weedy chicory might have evolved from domesticated ancestors or come to the United States as wild species. We used twelve microsatellite markers to assess the genetic diversity among herbarium samples and samples from the current Cichorium intybus populations in New England. We sampled native European and introduced New England populations, and we genotyped 32 individuals per population. Herbarium specimens showed presence of several alleles that have been lost over time. The obtained data have been analyzed with AMOVA and STRUCTURE. Microsatellite data indicate FST values above 0.15, reflecting an outcrossing breeding system and great genetic differentiation among populations. Our results suggest that there have been multiple introductions of chicory into New England - even local populations appear to have been founded by different sources from Eurasia.
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1 - University Of Massachusetts, Biology, 100 Morrissey Blvd, Boston, MA, 02125, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Delaware B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 9:00 AM