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COMBINING ABILITY AND EVALUATION OF GENETIC COMPONENTS OF SPRING VETCH VARIETIES (VICIA SATIVA L.) BY SEED WEIGHT PER PLANT

COMBINING ABILITY AND EVALUATION OF GENETIC COMPONENTS OF SPRING VETCH VARIETIES (VICIA SATIVA L.) BY SEED WEIGHT PER PLANT

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Abstract

Goal. To assess the combining ability, peculiarities and nature of inheritance of the trait of "seed weight per plant" in spring vetches varieties.

Results and Discussion. Effects of the general combining ability by the trait of "seed weight per plant" in 5 varieties were evaluated. The varieties can be broken down into 3 groups: group I - with high general combining ability, group II - with medium general combining ability, and group III - with low general combining ability. Group I includes Sputnytsya (gi = 0.72) and Pribuzhskaya 19 (gi = 0.22) varieties; group II - Liliana (gi = 0.15) and Bilotserkivska 96 (gi = 0.15); group III - Irina (gi = -0.65) variety. The value of the parameter H1/D was 49.25, which indicates overdominance, since H1> D; the value of √H1/D = 7.02, which indicates heterosis in hybrid material (√H1/D> 1). The ratio (1/2F)/(√D(H1-H2)) = 6.16, which is much higher than 1. This suggests that the average degree of dominance varies at different loci. Genetic analysis revealed a difference between the inheritance coefficients in a broad and narrow sense (Н2 = 0.90, h2 = 0.49). This suggests that the genetic variability is due non-additive effects of genes, and selection for individual seed productivity by phenotype will give no expected results in the first generation.

Conclusions. Among the five spring vetch varieties, Sputnytsya and Pribuzhskaya 19 varieties were characterized by high effects of general combining ability by the trait of "seed weight per plant". The trait of "seed weight per plant" is controlled both genes with additive action and genes with dominant, overdominant and epistatic effects. The variance ratio of general and specific combining abilities shows the different impact of additive and non-additive effects of genes on the expression of this trait. Analysis of the heritability coefficients shows the prevalence of non-additive effects of genes in the genetic control of the trait.

Keywords

spring vetch, variety, combining ability, variance, constant, genetic component, heritability