Sunflower Resistance to Race G of Broomrape (Orobanche Cumana Wallr.) In the Russian Federation: the Development of the Lines and the Study of Inheritance

Abstract The objective of this work is the development of sunflower lines that are not affected by race G of broomrape, as well as the determination of genetic control of resistance. The testing of the resistance of VNIIMK’s collection accessions of a cultivated sunflower of various origins was carried out on an artificial background made from the seeds of race G of broomrape. 6 lines resistant to race G were developed by the method of inbreeding on the basis of the obtained unaffected forms. The genetic control of resistance of one of them was studied. The resistance was inherited monogeneuosly, with incomplete dominance. There was established the presence of a reciprocal effect and the dependence of the resistance characteristic on the genotype of a susceptible parent under crossbreeding with certain lines. The other 5 sunflower lines are in the process of a hybridological analysis in order to determine the genetic control of their resistance. The combination of different genes of resistance to the same race of broomrape in one sunflower genotype could contribute to the long-term resistance of the crop to the parasite. The results of the presented study are of high importance for breeders, since the gene that we studied provides a new source of resistance to race G, thereby ensuring the protection of sunflower from the spread of new Orobanche pathotypes.