Sunflower breeding for resistance to new races of broomrape.

The purpose of this work was to establish a broomrape-tolerant sunflower population with resistance to race G. We selected the broomrape-resistant forms for further breeding for productivity on naturally and artificially infectious backgrounds under field conditions, as well as in greenhouses and climatic chambers of phytotron of V.S. Pustovoit All-Russian Research Institute of Oil Crops (VNIIMK). The RG (Or₇) line was used as a donor of resistance gene when developing a population of confectionery sunflower resistant directly to race G of broomrape. The recipient was a confectionery sunflower variety SPK Plus. Using hybridization, reciprocal crosses, and group interpollination with a harsh infectious background, we developed a sunflower population resistant to the virulent broomrape race for breeding confectionery sunflower varieties. [ABSTRACT FROM AUTHOR]