Abstract: The purpose of this study was to understand the Scletotinia resistance and resistance combining ability of our existing confectionery sunflower parents,and the disease resistance in F₁ by using this parents. Thus,it was to provide the basis for reasonable selection of parents. In this trial six cytoplasmic male sterile lines and six restorer lines of confectionery sunflower were developed 36 cross combinations. Twelve parents and 36 F₁were inoculated in Sclerotinia at the stage of flowering next year. The difference of Disease index(DI),Incidence rate(IR) and Relative incubation period(RIP) between patents,between parent and F₁,between F₁ were analyzed. It was showed that most of parents didn't express resistance to Scletotinia,a few of parents express medium resistance to Scletotinia,none of parents express high level of resistance to Scletotinia; the level of resistance of most lines were promoted from parents to F₁,the promotion is manifested as decreased incidence rate, redused lesion area, and the disease time delayed. It was appeared high level of resistance in F₁;The difference of resistance combining ability of parents was obvious,there were no connection between parents resistance and resistance combining ability. Lines that express high resistance and high resistance combining ability were ideal parents.

Key words: Confectionery sunflower, Scletotinia, Resistance

CLC Number: 

• S435.655