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The influence of mutant genes in homo- and heterozygous state on some quantitative characters of tomato (Lycopersicon esculentum Mill)

Author: Ţăranu Lilia
Degree:doctor of biology
Speciality: 03.00.15 - Genetics
Scientific adviser: Anatol Jacotă (decedat)
doctor habilitat, professor, Institute of Genetics, Physiology and Plant Protection of the ASM
Scientific council:


The thesis was presented on the 20 December, 2007
Approved by NCAA on the 28 February, 2008


Adobe PDF document0.46 Mb / in russian
Adobe PDF document0.45 Mb / in romanian


CZU 575.1.: 575.2.: 635.6

Adobe PDF document 1.88 Mb / in russian
138 pages


tomato, mutations, genes in homo- and heterozygous state, pleiotropic effect, variability, quantitative characters, pigments, resistance, inheritance, heterosis, duration of storage of tomato fruits


In the study it is considered the influence of some mutant genes, in homo- and heterozygous state, controlling the insufficiency of the chlorophyll, syntheses of the antociany, plant growing, regulation of maturation and period of storage of tomato fruits, on the genetic variability and particularities of the inheritance of some quantitative and qualitative characters of tomato. It was revealed that in the most of cases, the studied mutant genes in homozygous state differ from source cultivars, not only by one character, but by a complex of quantitative characters. To be noted that the number of modified characters at one mutant have varied from 2-4 to 12-13, depending on the type of the mutations. In homozygous state the recessive genes imb, ful, ig, mon, marm and aa rendered positive pleiotropic effect on cold resistance, while the genes imb, deb, aa on/or salt resistance.

In F1 hybrids the monogenic heterozis was revealed for one to several characters. In some hybrids the heterosis effect has been observed for 10 quantitative characters (ful/+), to others for 5-7 characters (deb/+, afl/+, aa/+, de/+, def/+) or for 2-3 characters (cpt/+, mon/+, ig/+).

In comparison with normal cultivars, the nor, rin and alc genes in heterozygous state caused the prolongation of vegetation period for 9-11 days (nor); 3 - 6 days (rin) and 8 - 10 days (alc), that allows to use these hybrids as source material for breeding of tardy sorts of tomato. There have been identified hybrid combinations with high productivity and heterosis effect in condition of open ground - Fl Korona/rin 12970 - 4.296 kg/plant or 188.25%; Fl Korona/alc -3.025 kg/plant or 146.66%; Fl Narvik/rin 12970 - 3.471 kg/plant or 139.85%; Fl Ballada/rin 12970 - 3.332 kg/plant or 138.53%; Fl Narvik/nor - 3.065 kg/plant or 126.47%; Fl Ballada/nor - 2.715 kg/plant or 115.55%. For obtaining F1 hybrids with long shelf life are recommended the hybrid combinations received on the base of ♀ Korona variety – F1 Korona/nor (170.68% or 84 days); F1 Korona/alc (152.47% or 65 days); F1 Korona/rin (131.36% or 51 days), as well as on the base of ♀ Ballada variety – F1 Ballada/alc (134.25% or 59 days) and F1 Ballada/nor (125.25 or 64 days).