The article presents the results of studying a mutant collection of tomato by the nature of the man-ifestation of such economically valuable traits as the type of growth and habit of plants. Shown high dif-ferentiation between mutants samples, 6 varieties were identified by the type of plant growth: 1. indeter-minate (32.2%), 2. semi-determinant (10.4%), 3. determinant (33.6%), 4. super-determinant (15.6%), 5. dwarfs (21.7%), and 6. columnar (0.008%). Indeterminate and determinant types are subdivided into subtypes: a) indeterminate ordinary and indeter-minate standard; b) determinant ordinary and determinant standard. Of greatest practical interest are the genotypes belonging to the 1, 3 and 5 groups.
The article presents the results on the use of lines of carriers of mutant marker genes in crossings to obtain heterotic F1 hybrids. The degree of dominance of the main traits of determining productivity (the duration of the growing season, the average number of flowers on inflorescences, the number of fruits and the mass of the fruit), depending on the characteristics of the initial parental forms, is shown. Combina-tions of hybrids with a high effect of heterosis in all studied features are isolated.
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