Heterosis for hull number and seed yield per plant in oil rape (Brassica napus L.)

Abstract

Heterosis for hull number and seed yield per plant was studied in the hybrid combinations of the F, genera­tion obtained by diallel-crossing five cultivars of winter oil rape. A trial with the parental lines and F, hybrids was established at the Rimski Šančevi Experiment Field of the Institute of Field and Vegetable Crops in Novi Sad. The materials were hand-sown according to a randomized block design with three replications. The size of samples used to analyze the two traits was 33 plants per treatment (parents and F1 hybrids). The level of heterosis was calculated relative to the parental mean (according to the formula H1=F1/(P1+P2/2) x l00) and relative to the better parent (according to the formula H2=F1/BPxl00). Heterosis for hull number was found m a number of combinations. The largest heterosis value relative to the parental mean was recorded in the combination Jet Neuf x Banaćanka (67.78%), while heterosis relative to the better parent ranged from -20.22 to 48.52%. Heterosis for seed yield per plant were high and positive in most of the combinations, except for Sremica x Banaćanka. The values ranged between 17.61 and 159 68% relative to the parental mean and between 3.40 and 149.00% relative to the better parent. .

Keywords

• oil rape
• heterosis
• hull number
• yield per plant