caa a22 4500 378901834 CHVBK 20180305123519.0 cr unu---uuuuu 161128e20040701xx s 000 0 eng 10.2298/hel0440133p doi (NATIONALLICENCE)gruyter-10.2298/hel0440133p WILD Helianthus species AND WILD-SUNFLOWER HYBRIDIZATION IN ARGENTINA [Elektronische Daten] ESPECIES SILVESTRES DEL GENERO Helianthus Y HIBRIDOS DE GIRASOL CULTIVADO Y SILVESTRE EN ARGENTINA / ESPÈCES SAUVAGES DU GENRE Helianthus ET HYBRIDATION DU TOURNESOL SAUVAGE EN ARGENTINE / [M. Poverene, A. Carrera, S. Ureta, M. Cantamutto] Two wild Helianthus species native to North America have been naturalized in Argentina, H. annuus ssp. annuus and H. petiolaris. They grow as adventitious overlapping about 50% of the crop area. Hybridization and introgression between these wild species and sunflower have important biological and practical consequences, the former including homoploid hybrid species formation, and the latter including a possibility of transgene spreading from genetically modified (GM) sunflower cultivars to wild or weedy populations. Wild populations were screened for isozyme and morphological variation. Intermediate plants were found in several locations and subjected to progeny tests. Variability among progeny of each one was compared with the variability in wild accessions of both species. Segregation for phenotypic traits, intermediate phenology and low fertility levels were found in most progenies, accounting for the hybrid origin of their maternal plants. Attempts to quantify gene flow included screening of progenies from H. petiolaris populations growing near sunflower crops. Hybrid plants were recognized by morphological traits and reduced fertility. Overall hybridization was about 1%. Hybrid progeny on wild H. annuus plants were identified by a crop isozyme marker. A mean frequency of 7% hybridization was found. These results confirm that gene flow occurs among crop and wild Helianthus species, and it concerns crop management and environmental impact if release of GM sunflower cultivars is to be authorized in Argentina. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. hybridization nationallicence isozymes nationallicence morphology nationallicence wild sunflower nationallicence Poverene M. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut Carrera A. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut Ureta S. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut Cantamutto M. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut HELIA De Gruyter 27/40(2004-07-01), 133-142 1018-1806 27:40<133 2004 27 helia https://doi.org/10.2298/hel0440133p text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.2298/hel0440133p text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Poverene M. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut NATIONALLICENCE 700 1- Carrera A. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut NATIONALLICENCE 700 1- Ureta S. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut NATIONALLICENCE 700 1- Cantamutto M. Departament of Agronomy, Universidad Nacional del Sur, Bahía Blanca, Argentina aut NATIONALLICENCE 773 0- HELIA De Gruyter 27/40(2004-07-01), 133-142 1018-1806 27:40<133 2004 27 helia CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter