Abstract
A modification of the ratio between the two stable isotopes 10B and 11B present in a material exposed to thermal neutrons entails a change in the total dose received, as a consequence of the capture reaction 10B ( n, α) 7Li. The genetic effects of this dose change were measured in the F 1 progeny of a cross between two Lycopersicon species which differ for the whole genotype including specific marker genes. Untreated plants, homozygous recessive for these genes, were pollinated with irradiated dry pollen which had been collected from dominant individuals cultivated with nutrient solutions containing respectively 91% and 5% 10B. For eleven criteria, the magnitude of the genetic effects (probably deletions) induced by irradiation was found to be modified by the boron treatment in a proportion which ranged from 4 to 65%, depending upon the criterion considered. The mutation frequency at specific nuclear sites was less boron-dependent than the frequency of non-specific mutations. This finding is in agreement with the hypothesis that boron is preferentially located at some distance from the cell nucleus.
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