Update on breeding for resistance to sunflower broomrape
[EN] Sunflower broomrape (Orobanche cumana Wallr.) is currently regarded as one of the most important constraints in sunflower (Helianthus annuus L.) production. In the last fifteen years, efforts to introduce genetic sources of resistance to this parasite in sunflower hybrids have been rapidly followed by the appearance of new virulent races that have overcome all known resistance genes. Due to this situation, most of the research efforts have focused on the development and characterization of new sources of genetic resistance to the most virulent races and also to investigate the genetic structure and variability of O. cumana populations and their evolution in order to develop long-term strategies for sunflower broomrape management. Results of evaluation of sunflower germplasm for resistance to different races have demonstrated that wild Helianthus species constitute the major reservoir of genes conferring resistance to new virulent races. Cultivated germplasms are also valuable sources of resistance genes. Most of the resistant sources have been found to be controlled by major genes, although quantitative resistance and epistatic effects have also been reported. Different dominance reactions depending on the race of broomrape, the source of resistance, and the susceptible parental line used for the cross have been observed. Molecular studies have shown that phenotypic variance for race E resistance was mainly explained by a major QTL associated with the resistance or susceptibility character, while race F resistance was explained by several QTLs with a small to moderate effect, mainly associated with the number of broomrapes per plant, suggesting the existence of a quantitative component in the resistance to race F. The relevance of these findings for sunflower breeding for resistance to broomrape is discussed.
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University of Novi Sad
2010
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| Subjects: | Inheritance, Broomrape races, Genetic resistance, Orobanche cumana, |
| Online Access: | http://hdl.handle.net/10261/92959 |
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Inheritance Broomrape races Genetic resistance Orobanche cumana Inheritance Broomrape races Genetic resistance Orobanche cumana |
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Inheritance Broomrape races Genetic resistance Orobanche cumana Inheritance Broomrape races Genetic resistance Orobanche cumana Fernández Martínez, José María Domínguez, Juan Pérez-Vich, Begoña Velasco Varo, Leonardo Update on breeding for resistance to sunflower broomrape |
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[EN] Sunflower broomrape (Orobanche cumana Wallr.) is currently regarded as one of the most important constraints in sunflower (Helianthus annuus L.) production. In the last fifteen years, efforts to introduce genetic sources of resistance to this parasite in sunflower hybrids have been rapidly followed by the appearance of new virulent races that have overcome all known resistance genes. Due to this situation, most of the research efforts have focused on the development and characterization of new sources of genetic resistance to the most virulent races and also to investigate the genetic structure and variability of O. cumana populations and their evolution in order to develop long-term strategies for sunflower broomrape management. Results of evaluation of sunflower germplasm for resistance to different races have demonstrated that wild Helianthus species constitute the major reservoir of genes conferring resistance to new virulent races. Cultivated germplasms are also valuable sources of resistance genes. Most of the resistant sources have been found to be controlled by major genes, although quantitative resistance and epistatic effects have also been reported. Different dominance reactions depending on the race of broomrape, the source of resistance, and the susceptible parental line used for the cross have been observed. Molecular studies have shown that phenotypic variance for race E resistance was mainly explained by a major QTL associated with the resistance or susceptibility character, while race F resistance was explained by several QTLs with a small to moderate effect, mainly associated with the number of broomrapes per plant, suggesting the existence of a quantitative component in the resistance to race F. The relevance of these findings for sunflower breeding for resistance to broomrape is discussed. |
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artículo |
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Inheritance Broomrape races Genetic resistance Orobanche cumana |
| author |
Fernández Martínez, José María Domínguez, Juan Pérez-Vich, Begoña Velasco Varo, Leonardo |
| author_facet |
Fernández Martínez, José María Domínguez, Juan Pérez-Vich, Begoña Velasco Varo, Leonardo |
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Fernández Martínez, José María |
| title |
Update on breeding for resistance to sunflower broomrape |
| title_short |
Update on breeding for resistance to sunflower broomrape |
| title_full |
Update on breeding for resistance to sunflower broomrape |
| title_fullStr |
Update on breeding for resistance to sunflower broomrape |
| title_full_unstemmed |
Update on breeding for resistance to sunflower broomrape |
| title_sort |
update on breeding for resistance to sunflower broomrape |
| publisher |
University of Novi Sad |
| publishDate |
2010 |
| url |
http://hdl.handle.net/10261/92959 |
| work_keys_str_mv |
AT fernandezmartinezjosemaria updateonbreedingforresistancetosunflowerbroomrape AT dominguezjuan updateonbreedingforresistancetosunflowerbroomrape AT perezvichbegona updateonbreedingforresistancetosunflowerbroomrape AT velascovaroleonardo updateonbreedingforresistancetosunflowerbroomrape AT fernandezmartinezjosemaria actualizaciondelasituaciondelamejorageneticadegirasolpararesistenciaaljopo AT dominguezjuan actualizaciondelasituaciondelamejorageneticadegirasolpararesistenciaaljopo AT perezvichbegona actualizaciondelasituaciondelamejorageneticadegirasolpararesistenciaaljopo AT velascovaroleonardo actualizaciondelasituaciondelamejorageneticadegirasolpararesistenciaaljopo |
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dig-ias-es-10261-929592018-08-03T10:05:08Z Update on breeding for resistance to sunflower broomrape Actualización de la situación de la mejora genética de girasol para resistencia al jopo Fernández Martínez, José María Domínguez, Juan Pérez-Vich, Begoña Velasco Varo, Leonardo Inheritance Broomrape races Genetic resistance Orobanche cumana [EN] Sunflower broomrape (Orobanche cumana Wallr.) is currently regarded as one of the most important constraints in sunflower (Helianthus annuus L.) production. In the last fifteen years, efforts to introduce genetic sources of resistance to this parasite in sunflower hybrids have been rapidly followed by the appearance of new virulent races that have overcome all known resistance genes. Due to this situation, most of the research efforts have focused on the development and characterization of new sources of genetic resistance to the most virulent races and also to investigate the genetic structure and variability of O. cumana populations and their evolution in order to develop long-term strategies for sunflower broomrape management. Results of evaluation of sunflower germplasm for resistance to different races have demonstrated that wild Helianthus species constitute the major reservoir of genes conferring resistance to new virulent races. Cultivated germplasms are also valuable sources of resistance genes. Most of the resistant sources have been found to be controlled by major genes, although quantitative resistance and epistatic effects have also been reported. Different dominance reactions depending on the race of broomrape, the source of resistance, and the susceptible parental line used for the cross have been observed. Molecular studies have shown that phenotypic variance for race E resistance was mainly explained by a major QTL associated with the resistance or susceptibility character, while race F resistance was explained by several QTLs with a small to moderate effect, mainly associated with the number of broomrapes per plant, suggesting the existence of a quantitative component in the resistance to race F. The relevance of these findings for sunflower breeding for resistance to broomrape is discussed. [ES] El jopo de girasol ( Orobanche cumana Wallr.) está considerado en la actualidad como uno de los problemas mas importantes del cultivo de girasol ( Helianthus annuus L.). En los últimos quince años, los esfuerzos realizados para incorporar fuentes de resistencia genética a este parásito en híbridos de girasol han estado acompañados por la rápida aparición de nuevas razas viru- lentas que superaban todos los genes de resistencia conocidos. Debido a esta situación, la mayoría de los esfuerzos de investigación se han centrado en el desarrollo y caracterización de nuevas fuentes de resistencia genética a las razas más virulentas del parásito, así como en la investigación de la estructura genética y variabilidad de las poblaciones de Orobanche cumana y de su evolución, con el objetivo de desarrollar estrategias duraderas a largo plazo para el control del jopo de girasol. Los resultados de evaluación de germo- plasma de girasol para resistencia a diferentes razas han demostrado que las especies silvestres de Helianthus constituyen la mayor fuente de genes de resistencia a las nuevas razas virulentas. El germoplasma cultivado es también una valiosa fuente de genes de resistencia. La mayoría de las fuentes de resist- encia están controladas por genes mayores, pero tanto resistencia cuantitativa como efectos epistáticos han sido tambié n identificados. Se han observado dif- erentes reacciones de dominancia dependiendo de la raza de jopo, la fuente de resistencia y la línea util izada como parental suscep tible. Estudios molecu- lares han mostrado que la varianza fenotípica para la raza E se explica princi- palmente por un QTL mayor asociado con la resistencia o susceptibilidad del carácter, mientras que la resistencia a la raza F estuvo controlada por varios QTL de efecto pequeño o moderado asociados principalmente con el número de jopos por planta, lo que sugiere la existencia de un componente cuantitativo en la resistencia a la raza F. Se discute la relevancia de estos resultados en la mejora para resistencia al jopo de girasol. Peer Reviewed 2014-03-05T07:48:56Z 2014-03-05T07:48:56Z 2010 2014-03-05T07:48:56Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.2298/HEL1052001F issn: 1018-1806 Helia 33(52): 1-12 (2010) http://hdl.handle.net/10261/92959 10.2298/HEL1052001F http://dx.doi.org/10.2298/HEL1052001F open University of Novi Sad |