Change of Mendelian ratios and meiotic recombination parameters in F 1 hybrid tomatoes under the influence of γ-irradiation

Abstract

The effect of γ-irradiation treatment of seeds of intra- and interspecific F₁ hybrid tomatoes on distortion of Mendelian monohybrid segregation, crossover variability, and recombination frequency of unlinked marker genes of chromosomes 2 and 6 was studied. It was found that more significant distortion effect on the segregation of marker loci of studied chromosomes was detected for seed treatment with 130 Gy. The significant direct relationship between Mendelian segregation for m-2 gene and a rf _m-2c vaue for 60 Gy and for aw and m-2 genes and rf _awc , _awm-2 values for 60 and 130 Gy treatment in combination Mo500 × var. cerasiforme was revealed. The latter corresponds to the effect of "quasirepulsion."

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