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Title

Genetic studies in sunflower broomrape

AuthorsRodríguez-Ojeda, M. I.; Pineda-Martos, Rocío ; Alonso, L. C.; Fernández Martínez, José María ; Velasco Varo, Leonardo ; Fernández-Escobar, J.; Pérez-Vich, Begoña
KeywordsCross-fertilization
Virulence
Inheritance
Hybridization
Genetic studies
Avirulence
Issue Date30-Oct-2014
PublisherWalter de Gruyter
CitationHelia 37(61): 151- 159 (2014)
AbstractMuch 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 reviews three genetic studies in sunflower broomrape. First, the inheritance of the absence of pigmentation in a natural mutant of this species with yellow plant color phenotype was studied. In a first stage, lines from the unpigmented mutant and a normally pigmented population were developed by several generations of self-pollination. Plants of both lines were crossed and the F<inf>1</inf>, F<inf>2</inf>, and F<inf>3</inf> 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 normally pigmented plants were conducted under pot and field conditions. The cross-fertilization rate was estimated as the percentage of F<inf>1</inf> 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 lines of O. cumana races E and F, developed by several generations of self-pollination. The F<inf>1</inf> and F<inf>3</inf> generations were evaluated on the differential line P-1380 carrying the race-E resistance gene Or<inf>5</inf>. 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.
Publisher version (URL)http://dx.doi.org/10.1515/helia-2014-0038
URIhttp://hdl.handle.net/10261/127619
DOI10.1515/helia-2014-0038
Identifiersdoi: 10.1515/helia-2014-0038
issn: 1018-1806
Appears in Collections:(IAS) Artículos
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