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Abstract Detail

Hybrids and Hybridization

Mattingly, Kali [1], Hovick, Steve [1].

Assessing the extent of hybridization between the invasive species Lythrum salicaria (purple loosestrife) and the horticultural species L. virgatum.

Lythrum salicaria (purple loosestrife) is considered one of the worst invasive species in Eastern North America. Negative ecological and economic impacts of L. salicaria invasion caused many states to prohibit its sale in the 1970s-80s. As a response to prohibition, nurseries replaced their stock of this beautiful flower with the closely related L. virgatum (European wand loosestrife). Lythrum virgatum can hybridize with L. salicaria to produce fertile offspring, and it has been hypothesized that introgression from L. virgatum to L. salicaria may promote invasiveness, as has been shown for other invasive species. Genetic admixture in general has been implicated in recent spread in L. salicaria invasion, but the extent to which hybridization with L. virgatum has contributed to L. salicaria genetics remains unexplored. We are testing the hypothesis that natural populations include genetic evidence of L. salicaria hybridizing with L. virgatum. We performed a preliminary survey of species-diagnostic morphology of specimens from natural populations. We found morphological variability consistent with hybridization, providing justification for additional genetic work. We are using sequence-related amplified polymorphism (SRAP) analysis to develop species-specific markers to differentiate native-range, non-hybrid L. salicaria and L. virgatum. A preliminary assay of 24 SRAP primer pairs amplified over 1300 loci, many of which were informative and polymorphic, and clearly differentiate the two species. We will use these markers to examine wild populations for evidence of L. virgatum introgression. Our work has implications for management of L. salicaria invasion and for understanding the role of genetic admixture in invasions more broadly. Detection of even a small degree of L. virgatum introgression would have major policy implications, because L. virgatum remains unregulated in many states.

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1 - The Ohio State University, Dept. Of Evolution, Ecology & Organismal Biology, 300 Aronoff Laboratory, 318 W. 12th Avenue, Columbus, OH, 43210, United States

invasive plants
population genetics

Presentation Type: Oral Paper
Session: 10, Hybrids and Hybridization
Location: 101/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 4:00 PM
Number: 10010
Abstract ID:690
Candidate for Awards:Margaret Menzel Award

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