Natural hybrids between cultivated and wild sunflowers (Helianthus spp.) in Argentina

Ureta, Soledad; Cantamutto, Miguel Ángel; Carrera, Alicia; Delucchi, Carla; Poverene, María Mónica

doi:10.1007/s10722-008-9326-x

Cited by 19 publications

(33 citation statements)

References 30 publications

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“…As the duration of SUN flowering period was near a week, more than a quarter of the AGR plants flowered in synchronicity with SUN, giving an opportunity for gene flow. Wild‐crop hybridisation is a frequent process under extensive agriculture in sunflower crop areas (Ureta et al ., ; Muller et al ., ). In this way, the mutation conferring SUN herbicide tolerance could easily be introgressed into wild relatives (Presotto et al ., ).…”

Section: Discussionmentioning

confidence: 98%

“…This mutation could easily be introduced into the agrestal biotypes through crop hybridisation (Presotto et al ., ). In South America and Europe, a rapid acquisition of herbicide resistance by weedy populations is highly likely, because of the extensive overlap of the geographic distribution and flowering period with the sunflower crop (Ureta et al ., ; Muller et al ., ). Due to the feasibility of crop–wild gene flow, this biotype seriously limits the release of new biotechnologies and challenges the future of sunflower crop production.…”

Section: Introductionmentioning

confidence: 98%

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Interference of the agrestal Helianthus annuus biotype with sunflower growth

Casquero

Cantamutto

2016

Weed Research

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The Helianthus annuus taxon includes the wild (ruderal), weedy (agrestal) and volunteer biotypes, which may share space and time with the sunflower crop. The agrestal biotype is one of the most harmful weeds challenging the use of modern biotechnological tools in sunflower. The interference of the agrestal biotype was studied at a range of weed densities within a sunflower crop. The area of influence of one agrestal plant was estimated as a circular area of more than 2.5 m 2 . The agrestal biotype at 10.7 plants m À2 reduced the sunflower seed production by 66%, the seed weight by 41% and the yield by 80%. The agrestal biotype showed intermediate vegetative stage duration between sunflower and the ruderal biotype. The interference of the agrestal biotype would be due to its high initial growth rate, its larger leaf area and plant height. Some agrestal plants showed partial dehiscence at the sunflower harvest stage replenishing the soil seedbank with over 18 000 seeds m À2 . The sunflower harvest operation and grain storage might be affected due to a fraction of agrestal plants remaining alive and moist when the crop reached harvest maturity. The results support the recommendation of preventing the entry of the agrestal biotype into crop production fields.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Interference of the agrestal Helianthus annuus biotype with sunflower growth

Casquero

Cantamutto

2016

Weed Research

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“…Wild hybridization is often detected by the presence of morphological intermediates (Gompert et al 2006;Norrmann 2009;Ureta et al 2008). However, if swamping occurs, it becomes more difficult to detect an ancestral hybridization event with subsequent generations because individuals with hybrid ancestry may become indistinguishable in morphology from the superior parent.…”

Section: Wild Populations Versus Observed Patterns Of Morphology and mentioning

confidence: 99%

Long-term experimental hybrid swarms between nearly incompatible Tigriopus californicus populations: persistent fitness problems and assimilation by the superior population

et al. 2012

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For the intertidal copepod Tigriopus californicus, outbreeding depression for a variety of fitness measures is typically observed in early-generation interpopulation hybrids. We examined both controlled crosses and longterm, freely mating experimental hybrid swarms composed of individuals from Baja California (Mexico) populations Playa Altamira and Punta Morro. In controlled crosses, F1 and F2 hybrids showed large and significant declines in hatching numbers compared to parentals, while reciprocal backcrosses produced no offspring at all. For long-term studies, four treatment groups were initiated: 100%PA, 100%PM, 50%PA: 50%PM, and 80%PA: 20%PM. Replicates were surveyed at 3-month intervals for morphometric, census and fitness measures. The PA and 80PA:20PM treatments had initial fitness below the PM treatment, and went extinct within the first 12 months of the experiment. The 50:50 treatment had fitness below the PM parent at the 3-and 6-month time points, recovered to equivalent or superior fitness from months 9 to 18, and dropped again below PM at month 21. Limited genotyping of diagnostic microsatellites was consistent with PM alleles going nearly to fixation in hybrid replicates and male morphological data were concordant with a shift toward PM values. Results were strikingly different from a recent study of a different pair of populations showing extensive introgression and superior fitness in hybrid populations. This demonstrates how longterm consequences of population mixing depend on the relative fitness and level of compatibility between hybridizing populations.

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“…As a consequence, the two species are frequently found in sympatry, with a patchy distribution, usually on the roadsides of disturbed agroecosystems, and often in contact with cultivated sunflower (Poverene et al., ). Over the years, off‐type individuals that exhibit intermediate morphological traits between the two species—and might be the product of hybridization—have been reported at these sites (Ureta, Cantamutto, Carrera, Delucchi, & Poverene, ).…”

Section: Introductionmentioning

confidence: 99%

Gene flow in Argentinian sunflowers as revealed by genotyping‐by‐sequencing data

Mondon

Owens

Poverene

et al. 2017

Evolutionary Applications

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Gene flow can have several different applied consequences, ranging from extinction to the escape of transgenes to the evolution of weedy or invasive lineages. Here, we describe patterns of hybridization and gene flow involving domesticated and wild sunflowers in Argentina. To address the risks of introgression of variants from the cultivated sunflower into invasive wild Helianthus, we used genotyping‐by‐sequencing (GBS) to genotype 182 samples from 11 sites in Argentina, along with previously published data from samples from the native range (North America), to determine the native source populations of the Argentinian samples and to detect admixture. We unexpectedly discovered two distinctive forms of H. petiolaris in Argentina, one from H. petiolaris subsp. petiolaris as expected, but the other from an unknown source. Extensive admixture was observed among Argentinian sunflowers, largely confirming phenotypic predictions. While many hybrids are F1s, there were signals consistent with introgression from the domesticated sunflower into H. petiolaris. Whether this introgression is incidental or a causal driver of invasiveness is not yet clear, but it seems likely that genes found in the domesticated sunflower genome (whether engineered or not) will quickly find their way into wild Argentinian sunflower populations.

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Natural hybrids between cultivated and wild sunflowers (Helianthus spp.) in Argentina

Cited by 19 publications

References 30 publications

Interference of the agrestal Helianthus annuus biotype with sunflower growth

Interference of the agrestal Helianthus annuus biotype with sunflower growth

Long-term experimental hybrid swarms between nearly incompatible Tigriopus californicus populations: persistent fitness problems and assimilation by the superior population

Gene flow in Argentinian sunflowers as revealed by genotyping‐by‐sequencing data

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