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Evol Appl

Title:		Populations of weedy crop-wild hybrid beets show contrasting variation in mating system and population genetic structure
Author(s):		Arnaud JF; Fenart S; Cordellier M; Cuguen J;
Address:		"Laboratoire de Genetique et Evolution des Populations Vegetales, UMR CNRS 8016, Batiment SN2, Universite des Sciences et Technologies de Lille - Lille 1 Villeneuve d'Ascq Cedex, France"
Journal Title:		Evol Appl
Year:		2010
Volume:		20100218
Issue:		3
Page Number:		305 - 318
DOI:		10.1111/j.1752-4571.2010.00121.x
ISSN/ISBN:		1752-4571 (Print) 1752-4571 (Electronic) 1752-4571 (Linking)
Abstract:		"Reproductive traits are key parameters for the evolution of invasiveness in weedy crop-wild hybrids. In Beta vulgaris, cultivated beets hybridize with their wild relatives in the seed production areas, giving rise to crop-wild hybrid weed beets. We investigated the genetic structure, the variation in first-year flowering and the variation in mating system among weed beet populations occurring within sugar beet production fields. No spatial genetic structure was found for first-year populations composed of F1 crop-wild hybrid beets. In contrast, populations composed of backcrossed weed beets emerging from the seed bank showed a strong isolation-by-distance pattern. Whereas gametophytic self-incompatibility prevents selfing in wild beet populations, all studied weed beet populations had a mixed-mating system, plausibly because of the introgression of the crop-derived Sf gene that disrupts self-incompatibility. No significant relationship between outcrossing rate and local weed beet density was found, suggesting no trends for a shift in the mating system because of environmental effects. We further reveal that increased invasiveness of weed beets may stem from positive selection on first-year flowering induction depending on the B gene inherited from the wild. Finally, we discuss the practical and applied consequences of our findings for crop-weed management"
Keywords:		Beta vulgaris genetic structure invasive species outcrossing rate timing of flowering weediness;
Notes:		"PubMed-not-MEDLINEArnaud, Jean-Francois Fenart, Stephane Cordellier, Mathilde Cuguen, Joel eng England 2010/05/01 Evol Appl. 2010 May; 3(3):305-18. doi: 10.1111/j.1752-4571.2010.00121.x. Epub 2010 Feb 18"