Genetic determination of productive tiller number in diallel crosses of winter barley in the Forrest-Steppe of Ukraine
Hudzenko V.M., Candidate of Agricultural Sciences, , Myronivsky Institute of Wheat Crafts of NAAS
Issue № 92. Part 1
For the first time in the Forest-Steppe of Ukraine parameters of genetic variation and combining ability of winter six-row barley varieties for productive tiller number in system of complete diallel crosses (7+7) have been investigated.
The purpose of the research is to reveal plant breeding and genetic characteristics of winter six-row barley varieties under conditions of the Forest-Steppe of Ukraine by productive tiller number and to identify effective sources to be used in crosses.
The research was carried out at the V. M. Remeslo Myronivka Institute of Wheat of NAAS in 2012/13–2014/15. Winter six-row barley varieties Paladin Myronivskyi, Zherar, Selena star, Strimkyi, Cartel, Existenz, Cinderella as well as F1 derived from crossing them with complete diallel scheme (7+7) were the research object. Analysis of variance, combining ability and genetic parameters were calculated in accordance to conventional methods (B.A. Dospekhov, 1985; M.A. Fedin et al., 1980).
Significant variability of productive tiller number level depending on the conditions of the year of research, both in paternal components and in hybrid combinations has been established. Despite this, in all the years significant differences between genotypes were noted that permitted to study them by combining ability and parameters of genetic variation.
It was noted shift in location of the varieties in relation to the regression line depending on conditions of year. The variety Cartel was in the dominant zone in all the years. This variety had stably high level of general combining ability (GCA) throughout the years of the research. The variance of the GCA significantly exceeded the variance of the specific combining ability in most cases. In genetic control of the trait intra-locus overdomination in all years has been observed, but between loci there was a strong epistasis in 2012/13, a weak epistasis in 2013/14 and an additive gene action in 2014/15.
Conclusions. Characteristics of genetic variation and combining ability parameters revealed testify to possibilities of breeding improvement of productive tiller number in the most genotypes analyzed. At the same time, significant variability of the trait and its complexity in genetic determination indicate that selections in later generations would be more effective. The variety Cartel has high value in combinative breeding for increase of the trait.
winter barley, productive tiller number, diallel crosses, parameters of genetic variation, combining ability, accounting information resource