The aim of the research was to assess the variability of economically valuable traits: the number of pods on the central inflorescence, the length of the pod and the number of seeds in the pod, in lines of mutant origin of spring rape. The studies were carried out in 2014–2015 in the conditions of the experimental field ETC of BNAU. The starting material was four lines of mutant origin of spring rape obtained from the Magnat variety after treatment of its seeds with mutagens. Variety Magnat and variety-standard Maria were taken for control. According to the research results, the following were identified: by the number of pods on the central inflorescence, the mutant lines IVR 16–7, IVR 16–5 and IVR 16–2. In the line of mutant origin IVR 16–7, on average, over the years of research, 34.7 pods were obtained on the main inflorescence, in mutant forms IVR 16–5 – 34.4 pods. and in IVR 16–2 – 33.8 pcs. respectively, which exceeded the standard variety Maria – 30.0 pcs. and the original variety Magnat – 23.5 pcs. In the line of mutant origin IVR 16–2, there was a slight variation of the trait, the average value of the coefficient of variation (V, %) was 7.4 %, the variance (s2) was 6.8, and the standard deviation (s) was 2.6. All of the above mutant forms showed stability in the formation of the number of pods on the central inflorescence over the years of research. The longest pod length was obtained in the IVR 16–7 line – 7.6 cm. A larger pod length compared to the controls was also obtained in the IVR 16–5 – 7.4 cm. According to the coefficient of variation, all the studied lines of mutant origin of spring rape were characterized by weak and medium varying the sign (V = 3.5–13.6 %). The largest number of seeds in a pod (28.2 pcs.) Was obtained in the line of mutant origin IVR 16–7, the average value of the indicator exceeded the standard variety Maria and the original variety Magnat by 1.7 seeds. This line was characterized by an average variation of the trait, as indicated by the obtained coefficient of variation V = 11.9 and 14.8 %. The line of mutant origin IVR 16–5 (27.7 pcs.) Was also distinguished by an increased number of seeds in the pod compared to controls. In IVR 16–2, the number of seeds in the pod was formed – 27.4 pcs., The line had a weak variation (V, %) – 5.7 and 6.6 % of the trait in the years of research.

Key words: line of mutant origin, spring rape, mutagenesis, selection, number of pods on the central inflorescence, pod length, number of seeds in a pod.