Evaluation of general and specific combining ability of new sunflower lines.
2009
Nuri Rad Davaji, A`raz Mohammad | A`deli, Yunes | Shari`ati, Farnaz
In order to evaluate GCA and SCA of 5 testers and 5 lines of oilseed sunflower, they were crossed at the Agricultural Research Station of Gonbad in 2006. The experiment comprising 25 sunflower hybrids as well as Hysun-33(check) was conducted in an RCBD with 3 replications at the same location in 2007 Effects of genotypes and crosses were significant on all traits studied with the exception of head diameter. Partitioning crosses effects to its components revealed that effects of lines on all traits evaluated were significant. Tester had the same effect with the exception of oil content. Estimating GCA of lines and testers showed that testers 1 & 5, lines 3 & 4 were the best parents for earliness and decreasing height due to negative and significant GCA of them for these traits. Tester 2 and lines 2 & 5 due to their positive and significant GCA effect may be used to increase oil content, grain and oil yield of their hybrids. In this study highest yields belonged to T2 x L5 and T2 x L2 with 2.626 and 2.442 t/ha grain yields respectively. They had significant superiority over check (hysun-33) for grain and oil yield. Genetic variance components revealed that, in most evaluated traits of compared crosses, estimated additive variance had more contribution than non-additive variance. Therefore breeding methods must be applied based on classic methods (selection), recombination and test cross approaches.
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