Abstract
Tritium applied as 3 H-orotic acid to the anthers of tomato during interphase—early prophase of meiosis increased recombination between the marker loci a and hl by approximately 50 per cent. The same amount of tritium applied as 3 H-thymidine or 3 H-water caused only small, non-significant increases. Equal parts of 3 H-orotic acid and 3 H-thymidine increased recombination by approximately 25 per cent. The 3 H-orotic acid and the 3 H-thymidine were localized in the RNA and DNA fraction respectively. The 3 H-water was not localized in nucleic acids. It is postulated that the 3 H-orotic acid is incorporated into the RNA of the synaptonemal complex during prophase of meiosis and increases recombination by localized β-irradiation.
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