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Genetic studies in sunflower broomrape

AutorRodríguez-Ojeda, M. I.; Pineda-Martos, Rocío ; Alonso, L. C.; Fernández Martínez, José María ; Velasco Varo, Leonardo ; Fernández-Escobar, J.; Pérez-Vich, Begoña
Palabras claveAvirulence
Cross-fertilization
Genetic studies
Hybridisation
Inheritance
Virulence
Fecha de publicación2014
EditorInternational Sunflower Association
Asociación Española del Girasol
CitaciónProceedings of the Third International Symposium on Broomrape ( Orobanche spp.) in Sunflower: 116-120 (2014)
ResumenMuch research has been conducted to identify sources of genetic resistance to sunflower broomrape (Orobanche cumana Wallr.) and to study their mode of inheritance. However, studies on the parasite have been scarce. This manuscript describes three genetic studies in sunflower broomrape. First, the inheritance of the absence of pigmentation in a natural mutant of this species with yellow plant colour phenotype was studied. Plants of a mutant line were crossed by plants of a normally pigmented line and the F1, F2, and F3 generations were evaluated. The results indicated that plant pigmentation is controlled by a partially dominant allele at a single locus. Second, the unpigmented mutant was used to evaluate outcrossing potential of the species. Two experiments in which single unpigmented plants were surrounded by pigmented plants were conducted under pot and field conditions. The cross-fertilization rate was estimated as the percentage of F1 hybrids in the progenies of unpigmented plants, which averaged 21.5% in the pot and 28.8% in the field experiment. The results indicated that, under the conditions of this study, the species was not strictly self-pollinated. Finally, the inheritance of avirulence was studied in crosses of plants from inbred lines of races E and F, by evaluating the F1 and F3 generations on the differential line P-1380 carrying the race-E resistance gene Or5. The results suggested that race E avirulence and race F virulence on P-1380 are allelic and controlled by a single locus, which confirmed the gene-for-gene theory for the O. cumana-sunflower interaction.
DescripciónTrabajo presentado en el Third Internacional Symposium on broomrape (Orobanche spp.) in Sunflower, celebrado en Córdoba (España) del 3 al 6 de junio de 2014.
URIhttp://hdl.handle.net/10261/159840
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