Published in Scientific Papers. Series B, Horticulture, Vol. LXVII, Issue 1
Written by Nadejda MIHNEA, Galina LUPAŞCU, Diana BRAŞOVEANU
The paper presents the results of assessing the resistance of some parent varieties and reciprocal F1 combinations of tomatoes to stressful (40º, 42ºC) and optimal (25ºC) temperatures. The analysis of the variability of the resistance character was carried out based on the length of the embryonic radicle, stem and whole seedling. In most of the cases stressful temperatures produced significant inhibition of growth organs. The differences in the manifestation of the analyzed characters in the reciprocal F1 hybrids both in the control variant and in the variants with stressful temperatures demonstrate the involvement of the parental factor in their phenotype on the background of different temperatures. The maternal effect was more pronounced at the temperature of 42ºC than under optimal conditions. Manifesting of the parental entity effect on the degree and orientation of dominance reveals its influence on the allelic interactions of the F1 heterozygous genotype. The overdominance in relation to the best parent indicates that the parental entity intensifies the influence of the recessive alleles on those dominant, involved in the control of growth characters of tomato plants.
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