BIOMETRIC-ANALYSIS OF FREQUENCIES OF SPON TANEOUS TUMORS IN INBRED LINES OF RADISH

Analysis of frequencies of tumors on radish roots in 34 radish lines o ver 8 - 16 years of growing (successive generations of inbreeding) was conducted. it was shown that in lines originated from the varieties V irovskii belyi (15 lines), Saxa (13 lines), and Ledyanaya sosul'ka (6 lines), frequencies of spontaneous tumors form a continuous series ran ging from 1 to 100%. All plants of the four lines VL-350, SL-337/24, S L-337/76, and SL-337/77 formed tumors every year. The remaining 30 lin es vary in frequencies of tumor formation. A pedigree analysis evidenc ed that this variation was connected to growing conditions (year) rath er than to segregation for the corresponding genes, A two-way analysis of variance (line and year), conducted over six years, showed that di fferences between lines account for 83.0% of total variability. Only 2 .9% of variation is related to growing conditions in different years. A bootstrap analysis demonstrated that in 29 lines with varying freque ncies of tumors, a true confidence interval is higher on average by a factor of 1.48 for all lines thana binomial confidence interval. A med ian of tumor frequencies is 19.9% for 15 lines of the variety Virovski i belyi, 19.6% for 13 lines of the variety Saxa, and 4.8% for 6 lines of the variety Ledyanaya sosul'ka, and the differences between lines o f Virovskii belyi and Ledyanaya sosul'ka are statistically significant and correlate with the differences in frequencies of spontaneous tumo rs typical for these varieties. The genetic basis of tumor formation i n radish is discussed by comparing the results obtained with similar d ata on manifestation of morphological deviations (phenodeviations) in animal inbred lines.