A double-tester method in studying of genetics of a trait seeds amount per a head in sunflower interline hybrids

Inheritance of a trait seeds amount per a head at sunflower interline CMS-hybrids was studied. Tests were conducted on fields of All-Russia research institute of oil crops, Krasnodar, in 2012-2014. The objects of the research were ten fertile sunflower lines, as testers were used two CMS-forms (line and a simple CMS-hybrid) which are differed with a low and high display of the studied trait, respectively. Seeds of 20 hybrids of the studied lines and two testers were produced in 2012; in 2013 and 2014 these hybrids and their parental lines were cultivated in fields, in four-row plots with a square 24.5 sq. m, in three repetitions. The results of the double-tester analysis of parental forms and their hybrids allowed concluding the absence of epistasis in a genetic control of the trait seeds amount per a head. An additive gen interaction and dominance play the main role in this trait inheritance in the interline sunflower hybrids. To improve the studied sunflower breeder seeds it is reasonable to use the methods of recurrent selection for a common combining ability, convergent improvement and cumulative breeding