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Genetic Identity and Diversity of Perennial Pepperweed (Lepidium latifolium) in Its Native and Invaded Ranges

Published online by Cambridge University Press:  20 January 2017

John F. Gaskin*
Affiliation:
USDA Agricultural Research Service, 1500 N. Central Avenue, Sidney, MT 59270
Mark Schwarzländer
Affiliation:
University of Idaho, Department of Plant, Soil and Entomological Sciences, Moscow, ID 83844
Hariet L. Hinz
Affiliation:
CABI, Rue des Grillons 1, CH-2800 Delémont, Switzerland
Livy Williams III
Affiliation:
USDA-ARS, European Biological Control Laboratory, Campus International de Baillarguet, CS90013 Montferrier sur Lez, 34988 St. Gely du Fesc CEDEX, France
Esther Gerber
Affiliation:
CABI, Rue des Grillons 1, CH-2800 Delémont, Switzerland
Brian G. Rector
Affiliation:
USDA-ARS, Great Basin Rangelands Research Unit, 920 Valley Road, Reno, NV 89512
DaoYuan Zhang
Affiliation:
Key Laboratory of Biogeography and Bioresources in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
*
Corresponding author's Email: john.gaskin@ars.usda.gov

Abstract

Perennial pepperweed is an invasive plant species in North America, native to temperate Eurasia and northern Africa. Effective biological control depends upon correct taxonomic identification. Therefore, we investigated morphological and genetic data (cpDNA sequences and amplified fragment length polymorphisms [AFLP]) in its native range, where the species is at times treated as multiple taxa (L. latifolium, L. affine and L. obtusum). We also analyzed genetic data to determine the number and distribution of haplotypes and genotypes in the invaded range. Using Bayesian analysis, we found three clusters of AFLP genotypes in the native range, but little correlation between these clusters and morphological characters used to distinguish taxa. Also, we found combinations of morphological character states within many native range plants that are incompatible with current species descriptions, offering no support for splitting L. latifolium sensu lato into three species. In North America 97% of the genetic variation was among populations and there were only eight AFLP genotypes in 288 plants, suggesting few introductions or a severe bottleneck, and little or no creation of new genotypes since introduction. We found plants in the native range that are genetically similar (88 to 99%) to six of the eight invasive AFLP genotypes, suggesting that Kazakhstan and China are origins for much of the North American invasion.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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References

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