Genetic variability components of some quantitative traits of winter oilseed rape - Brassica napus L.

Abstract

Analysis of genetic variance components for number of leaves and branches per plant and stem diameter was done according to the method of HAYMAN (1954). Heritability in narrow (h2a) and broad (h2b) sense was determined for the same traits, using the method of Mather and Jinks (1971). Non-additive component of genetic variance was greater than additive component in all three studied traits. Dominant and recessive genes were not equally distributed in parent genotypes, with dominant genes prevailing. Ratio (H1/D)1/2 was higher than 1 in all three tested traits. Calculated values for heritability in narrow sense showed that stem diameter and number of branches per plant are traits with low heritability, and number of leaves per plant a trait with the high heritability. Heritability in a broad sense Was high for all three tested traits.

Analiza komponenti genetičke varijanse rađena prema HAYMAN (1954) i heritabilnost u užem (h2a) i širem (h2b) smislu rađena prema MATHER i JINKS (1971) urađeni su za broj listova i primarnih grana po biljci i prečnik stabla. Neaditivna komponenta genetičke varijanse bila je veća od aditivne komponente kod sva tri proučavana svojstva. Dominantni i recesivni geni nisu bili podjednako raspoređeni kod roditeljskih genotipova, a preovladavali su geni sa dominantnim efektima. Odnos (H1/D)1/2 je bio veći od jedinice kod sva tri navedena svojstva. Izračunate vrednosti za heritabilnost u užem smislu (h2a) ukazuju da su prečnik stabla i broj primarnih grana po biljci niskonasledna svojstva, a broj listova po biljci visokonasledno svojstvo. Heritabilnost u širem smislu (h2b) bila je visoka kod sva tri proučavana svojstva.