Abstract
Three fast neutron and 9 ethyl methanesulfonate (EMS) induced waxy (wx) mutants of maize were compared with regard to differences in the type of accompanying genetic alterations. Pollen grain analysis of F 1 hybrids between the induced wx mutants and a tester wx stock revealed in radiation-induced mutants an absence or a very few non-waxy (Wx) pollen grains. However, most of the EMS-induced mutants produced Wx pollen grains at a higher frequency in the F 1 hybrids, suggesting that there was less cytogenetic damage than with neutrons. The results of segragation tests with a linked marker gene in the selfed progenies of the mutant-tester hybrids supported this in that there was a lower survival of a marker gene C 1, which had been linked to the radiation-induced wx genes, whereas the EMS-induced mutants showed normal segragation of the marker gene.
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