Screening for resistance to broomrape (Orobanche cernua) in cultivated sunflower |
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| Authors: | J Dominguez J M Melero-Vara J Miller J M Fernández-Martinez |
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| Institution: | Departmento de Mejora y Agronomia, C.I.D.A., Apdo. 4240, E-14080 Córdoba, Spain;Instituto de Agricultura Sostenible, C.S.I.C., Apdo. 4084, E-14080 Córdoba, Spain;ARS, USDA, Fargo ND 58105, USA |
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| Abstract: | Racial evolution of sunflower broomrape (Orobanche cernua) has been very rapid in Spain during recent years, in which resistance has been overcome several times and there has been an important increase in areas infested with this parasitic angiosperm. In order to find resistance to a highly virulent population of sunflower broomrape that could be used directly in breeding programmes, three different sets of cultivated plant material composed of 429 entries were tested by artificial inoculation. All evaluated inbred lines from Moden, Canada, were fully susceptible. Out of the 240 P.I. accessions tested, only 10 segregated for resistance to broomrape, the rest being susceptible. From the 160 USDA breeding lines evaluated, 5% were resistant and 19% segregated for resistance to O. cernua. These lines traced back mainly to crosses of RHA 274 and RHA 801 with Russian, Turkish and Romanian hybrids. The origin of P.I. accessions that segregated for resistance were primarily derived from the former USSR and from Romania. |
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| Keywords: | Helianthus annuus Orobanche cernua disease resistance high virulence resistance screening |
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