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Objective: Chamaecrista fasciculata is a widespread annual legume across
Eastern North America, with potential as a restoration planting, biofuel
crop, and genetic model for non-papillinoid legumes. As a non-Papilinoid,
C. fasciculata, belongs to the Caesalpiniod group in which nodulation
likely arose independently of the nodulation in Papilinoid and Mimosoid
legumes. Thus, C. fasciculata is an attractive model system for legume
evolution. In this study, we describe population structure and genetic
diversity among 32 USDA germplasm accessions of C. fasciculata using 317
AFLP markers developed from 12 primer pairs, to assess where
geographically there is the most genetic variation. Results: We found that
the C. fasciculata germplasm collection fall into four clusters with
admixture among them. After correcting for outliers, our analysis shows
two primary groups across Eastern and Central North America. To better
understand the population biology of this species, further sampling of the
full range of this widespread species is needed across North America, as
well as the development of a larger set of markers providing denser
coverage of the genome. Further sampling will help clarify geographical
relationships in this widespread temperate species.
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