تحليل معامل المسار و تقدير المعالم الوراثية و المظهرية و الارتباط لمحصول الشعير (Hordeum vulgare L.)‎

الملخص EN

A field experiment was carried out in Al-diwaniyah province during the winter of season 2015-2016 to study the genetic parameters, broad sense heritability, genetic, phenotypic and environmental correlations and path coefficient for grain yield parameters and it’s components for four varieties of barley.

The results showed that environmental variances and values of phenotypic variance coefficient were close to values of genotypic variance coefficient for most parameters and the highest was for tiller number.

The highest ratios of broad sense heritability were for the flag leaf area, plant height and grain yield (0.969 ، 0.961 ،0,924) respectively.

Genetic correlation coefficients of all studied traits were higher than phenotypic correlation coefficients, suggesting genetic variation among varieties was mainly genetic with little effect of environment.

Grain yield has positive genetic and phenotypic correlations with studied traits (plant height and number of tillers per square meter) with the highest correlation value for number of spike per square meter ) 5.95, 5.95( respectively.

The highest direct effects on grain yield were of number of grain per spike and number of spikes per square meter with path coefficient values of (6.1 and 4.7) respectively, and hence Path coefficient analysis reveals that the direct selection of these two traits (number of grain per spike and number of spikes per square meter) will be effective in improving grain yield in barley crop.