Mechanisms of inheritance in durum wheat genotypes
Krasimira Taneva, Rangel Dragov, Spasimira Nedyalkova, Violeta Bozhanova
Abstract: Creating high-yielding cultivars with improved grain quality is a major priority in durum wheat breeding. Variability, heritability and genetic advance were studied for the following traits: grain yield, plant height, productive tillering, spike length, number of spikelets per spike, number of kernels per spike, kernels weight per spike, thousand kernel weight, protein content, wet gluten content, SDS–sedimentation value, yellow pigments content, vitreousness and test weight of 90 durum wheat genotypes of different origins. The phenotypic coefficient of variation (PCV) was established to be higher than the genotypic coefficient of variation (GCV) for all studied traits, which reflects the impact of the environmental conditions on the variation of these traits. The highest phenotypic (PCV-41.66%) and genotypic (GCV-41.39%) coefficients of variation were established for sedimentation value. High broad-sense heritability coefficients (h2BS) were established for almost all studied traits. The heritability for these traits ranged from 54.74% for number of kernels per spike to 98.72% for SDS-sedimentation value. The lowest coefficient of heritability was established for kernels weight per spike – 5.5%. High genetic advance as a percentage of the mean was calculated for the following traits: SDS-sedimentation value (84.71%) and grain yield (20.95%). A high heritability coefficient combined with high genetic advance was found for the following traits: SDS-sedimentation value and grain yield. This shows the presence of additive gene effects in the exression of these traits and therefore direct selection by these traits is possible under our conditions.
Keywords: genetic advance; genotypic coefficient of variation; heritability; phenotypic coefficient of variation; qualitative traits of grain
Citation: Taneva, K., Dragov, R., Nedyalkova, S. & Bozhanova, V. (2023). Mechanisms of inheritance in durum wheat genotypes. Bulg., J. Agric. Sci., 29(6), 1112–1119.
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| Date published: 2023-12-15
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