Submitted to: European Conference on Sunflower Biotechnology
Publication Type: Abstract only
Publication Acceptance Date: 10/25/2001
Publication Date: 1/1/2002
Citation: PEREZ-VICH, B., AKHTOUCH, B., MUNOZ-RUZ, J., FERNANDEZ-MARTINE, J.M., JAN, C.C. INHERITANCE OF RESISTANCE TO A HIGHLY VIRULENT RACE "F" OF OROBANCHE CUMANA WALLR. IN TWO SUNFLOWER LINES DERIVED FROM INTERSPECIFIC AMPHIPLOIDS. SUNBIO 2001. FIFTH EUROPEAN CONFERENCE ON SUNFLOWER BIOTECHNOLOGY. JAN 2002. ABSTRACT P. 39. Interpretive Summary:
Technical Abstract: Broomrape (Orobanche cumana Wallr.) populations belonging to a new race F in Spain have overcome all known resistance genes Or1 to Or5 in cultivated sunflower (Helianthus annuus L.) and are spreading rapidly. Resistance to race F of this parasitic weed has been found in wild perennial species of Helianthus and has been introgressed into cultivated sunflower. The objective of this study was to characterize the inheritance of resistance genes in cultivated sunflower derived from wild perennial species H. divaricatus and H grossesserratus, respectively. Crosses between resistant cultivated lines and the susceptible line P21 were made, and most of the F1's were resistant when evaluated for broomrape resistance using a highly virulent population of race F indicating dominance reaction of resistance genes. Evaluation for resistance of segregating populations of F2 and BC1F1 to both parents confirmed in some of the crosses the dominance reaction of the F1. This dominance reaction of resistance genes will greatly simplify the breeding procedure for resistance.