Translation of the article has been investigated and Experiemental mutagenesis research applied in crop breeding agricultural research institutes in various Bulgarian during the last half century. the major accomplishments achieved In this paper some in Bulgaria are physical mutagens highlighted. Both, (mainly gamma rays) and chemical mutagens (mainly EMS, NMU, NEU), have been used and their proper doses have been established According to the information available. to the author, there are more than 76 new cultivars developed using induced mutants in barley, namely: Bulgaria (5), durum wheat (5), (9), wheat, sunflower, maize (26), (3), (4), lentil, pea, bean (2) (1), (2) vetch, chickpea and soybean (5), tom.ato (6), pepper (4), cotton (2), tobacco (2). Some of the mutant cultivars such as maize hybrid Kneja 509 and durum wheat cultivar Gergana have become leading cultivars occupying up to 50% of the growing area of the crop concerned. In durum wheat, mutant cultivars have not only covered almost all the growing areas but also doubled the yield in the past 30 years. The achievements in mutation breeding programmes have also had a significant impact on the progress of genetic research by elucidating the underlying mechanisms of induced mutations and the training of many young researchers and university students through their involvement in various research projects. A number of mutant lines with novel characteristics and mutant cultivars of economical importance together with relevant techniques used in the development and characterization of those mutant lines/cultivars are described in this paper.
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