Combining ability analysis for seed and straw yields and their components in a diallel cross of flax. [electronic resource].

Includes references.

Twenty-one entries of flax (Linum usitatissimum, L.) involving 6 parental genotypes and their IS F\'s hybrids were evaluated for seed and straw yields apd their components at ltay EI-Barood Agric. Res. Station dwing 2000/2001 season Wlder two different plant distances. Diallel analysis according to Griff'mg (1956) was used. Mean squares due to entries, parents and crosses were highly significant indicating that parental genotypes as well as their F1 crosses exhibited reasonable degrees of variability for all studied traits. Both GCA and SCA variances were highly significant, indicating the presence ofboth additive and dominance types of genetic variances. The additive effects were more important than non-additive effects for plant height, tecluticallength. fiber percentage, seed index and days to maturity. On the other hand, the non-additive effects were more effective than additive for straw yield! plant, No. ofbasal branches Iplant, stem diameter, fiber fmeness, seed yield 1 plant, No. of capsules/plant and oil and protein percentages. Some of crosses which exhibited significant and positive SCA effects included high x high and high x low general combiners, such as Sakhal cv, imported fiber type Alba and the two new strains 402/12 and 282/98/16/2 suggesting that, the breeding procedure which utilize both additive and non-additive genetic variances would be more useful for improvement of both straw and seed yields of flax.

Summary in Arabic.

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