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Thesis (M.S.)–University of Nebraska–Lincoln, 1959. Department of Agronomy.


Copyright 1959, the author. Used by permission.


Individual plants of two genetic stocks homozygous for marker genes on Chromosomes 2 and 7 were crossed to the inbred line WF9, which carries the normal alleles of these genes.Half of the F1 seed was irradiated with various doses of thermal neutrons, and the remainder was retained as control.Individual plants in the F2 and backcross generations of these single crosses were classified phenotypically on the basis of the marker characteristics as soon as these traits could be easily recognized.Data were taken on plant height, ear height, date of flowering, and yield to determine the association between these quantitative characters and the marker genes used.Appropriate chi-square tests were used to test the significance of differences observed between control and treated progenies.

Various hypotheses are considered as possible explanations for the apparent effect of radiation on the association between genes.No conclusions are made here, but it would appear that the ability of thermal neutron radiation to produce chromosomal breaks is in some way involved in the changes in recombination observed.

Advisor: Charles O. Gardner