Phlox drummondii II

Growing points of four weeks old seedling of Phlox drummondii were smeared with 0.5% emulsion of colchicine in lanolin. One plant out of 20 survivors was found to be a chimera; branches developing from cells treated with coichicine showed an interchange complex of four chromosomes whilst those originating from untreated cells were cytologically normal. Cytogenetical properties of the reciprocal translocation are presented and the possible mechanisms by which colchicine could have induced the reciprocal translocation are discussed.