Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



The induction of diploid true-breeding mutants by colchicine treatment of a true-breeding variety of sorghum vulgare Pers. Has been reported by Franzke and Ross (9); Ross, Franzke and Schuh (22); and others (7,10). It has been suggested that such mutant plants might result from point mutations made homozygous by a somatic reduction of the chromosomes followed by a doubling of the chromosome number in a cell which organized a growing point after the original one had been inactivated during c-tumor formation. Observations made during the course of routine work with sorghum indicated that after colchicine treatment some varieties produced tetraploids with few or no gene mutations. The present studies were undertaken during the summer of 1955 and the winter of 1955-56, to demonstrate differences between varieties of sorghum in their reaction to colchicine treatment and to investigate the bases for such difference. The material used in this study consisted of Experimental 3, an unreleased variety, and Norghum, a released variety, both produced by the South Dakota State College Agricultural Experiment Station, and two translocation stocks obtained from the University of Nebraska.

Library of Congress Subject Headings

Sorghum -- Genetics


Includes bibliographical references (pages 57-59)



Number of Pages



South Dakota State University


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