Journal
GENETIC RESOURCES AND CROP EVOLUTION
Volume 56, Issue 6, Pages 869-877Publisher
SPRINGER
DOI: 10.1007/s10722-009-9409-3
Keywords
Crop-wild hybridization; Geographic survey; Helianthus annuus L.; Phenotypic diversity; Weed
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Funding
- Bureau des Ressources Genetiques
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We made a first descriptive study of weedy sunflowers infesting sunflower crop fields in one Spanish and three French regions. Overall, weedy sunflowers affected around 15% of sunflower fields. Infested fields were most often dispersed over the study areas without evident geographical clustering. In France, five weedy populations were surveyed more intensively. They were composed of a large diversity of morphotypes showing a combination of typical wild and domesticated traits in proportions that differed between populations. Yield losses reached 50% in heavily infested patches. Our results suggest that weedy sunflowers may have arisen through the hybridization of cultivated and wild sunflower, potentially during the seed production process. Such crop-wild hybrids would have been introduced recurrently into fields through the seed lots, where they evolved to locally invasive weedy populations.
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