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NEW TOMATO LINES WITH GENES OF QUALITATIVE TRAITS AS SOURCES FOR BREEDING

NEW TOMATO LINES WITH GENES OF QUALITATIVE TRAITS AS SOURCES FOR BREEDING

Institution

Institute of Vegetables and Melon Growing

Section

SOURCES AND DONORS

Abstract

Goal. To evaluate bred multi-marker tomato lines for a set of economic traits.

Results and discussion. The results of studying new multi-marker tomato lines in a competitive variety trial are given. Twelve lines were evaluated for the growing season length and its phases, traits of performance and chemical composition of fruits. It was revealed that according to the growing season length all the lines were early-ripening and gave yields 97-110 days after emergence. Line L-120/18 was selected by the shortest “emergence - the first fruit ripening” period (97 days) and by the shortest interphase “the first sprouts – anthesis” (52 days) and “anthesis - the first fruit ripening” (45 days) periods. In terms of performance, lines L-106/18 L-164/18 L-474/18 L-98/18 lines were the best, generating 2.6-3.5 kg of fruits per plant. The average fruit weight of the lines was lower than that of standard variety Karas and ranged from 40.5 g in line L-419/18 to 95.6 g in line L-106/18. As to the fruit number per plant (more than 24), lines L-419/18 L-164/18 L-474/18 L-473/18 L-106/18 L-98/18 L-125/18, and L-120/18 were distinguioshed. Biochemical assessments of tomatoes of the lines showed that most of the parameters under investigation were better in all the lines than those in the standard variety. The high content of soluble dry matter (6.8%) was found in line L-473/18; the total sugar content was the highest in lines L-473/18 (5.63%), L-99/18 (4.52%), L-106/18 (4.24%), L-102/18 (4.23%), and L-419/18 (4.23%); the vitamin C content was remarkable in lines L-125/18 (22.9 mg/100 g) and L-99/18 (23.0 mg/100 g); the titrated acidity was good in lines L-125/18 (0.75%) and L-474/18 (0.63%). Lines L-473/18 (15.6), L-99/18 (12.6), L-106/18 (11.8), and L-102/18 (10.8) stood out by their sugar-acid index.

Conclusions. The study of new multi-marker tomato lines in the competitive variety trial revealed their peculiarities in expression of the major economic characteristics. We selected lines that were superior to standard variety Karas by the growing season length, perfoemance and fruit quality. Lines L-106/18 (sp, Aft, c, gf), L-164/18 (u, y, gf, B), L-98/18 (sp, u, Aft, gs, gf, j-2), L-125/18 (Aft, hp-2dg, alc, u), L-99/18 (sp, u, Aft, hp-1), and L-120/18 (sp, Aft , hp-1, u, o, j-2) were offered as sources for breeding. The expediency of using these lines also lies in the fact that, in addition to economic traits, they are carriers of mutant genes that which are easily identified and inherited by Mendel's simple laws, which facilitates their combination, significantly speeds up selection of desired genotypes and generation of forms with a set of specified traits.

Keywords

tomato, line, marker genes, vegetation period, performance, biochemical characteristics