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Clonal structure of invasive hoary cress (Lepidium draba) infestations

Published online by Cambridge University Press:  20 January 2017

John F. Gaskin
John F. Gaskin*
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Northern Plains Agricultural Research Laboratory, 1500 North Central Avenue, Sidney, MT 59270; [email protected]
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Abstract

Hoary cress is a perennial herbaceous weed that has invaded agricultural and natural areas of western North America. Invasions are often composed of dense patches, and it is unclear whether clonal growth via lateral rhizomes or seedling recruitment is the dominant method of patch expansion. To study the clonal structure of this invasive, six patches from three USA populations (194 ramets) were analyzed with the use of Amplified Fragment Length Polymorphisms (AFLPs). Known siblings and clones were also included to ensure sufficient variation for discrimination between clonal and nonclonal ramets. Patches had low genet/ramet ratios (mean G/N = 0.25) and low diversity levels (mean D = 0.49) compared to similar clonal studies. Single genets represented 55–85% of the ramets sampled in a patch, and the largest genet was 38 m across. Hoary cress exhibits a strong bias toward patch-size increase from clonal reproduction rather than from seedling recruitment. Results indicate that biological control methods that focus on reducing or eliminating seed production would do little to stop expansion of a patch. Despite the domination of a patch by one or a few large genets, other smaller genets are able to persist or are occasionally recruited into dense areas of a patch.

Keywords

Hoary cress, Lepidium draba L. [= Cardaria draba (L.) Desv.], CADDRClonal reproductioninvasive weed
Type
Weed Biology and Ecology
Information
Weed Science , Volume 54 , Issue 3 , June 2006 , pp. 428 - 434
Copyright
Copyright © Weed Science Society of America 

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