Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 10:154-156 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Studies of Induced Mutants in Melilotus alba. II. Inheritance and Complementation of Chlorophyll-deficient Mutants1

B. G. Gengenbach,, H. J. Gorz and F. A. Haskins2

Six ethyl methanesulfonate-induced mutants of Melilotus alba Desr. were studied. Five of the mutants behaved as monogenic recessives. In the sixth mutant, two independent recessive alleles were responsible for the observed phenotype. Of these two genes, one had a phenotypic effect similar to the five single-gene mutants. The other (the veined gene) caused a chlorophyll deficiency in which the leaf veins were darker in color than the tissue between the veins. Complementation analysis revealed that five of the seven genes detected in the mutants were nonallelic. Suggested designations for the five genes are ch4, ch5, ch6, ch7, and chv.

Key Words: Sweetclover • Ethyl methanesulfonate

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Nebraska Agricultural Experiment Station, Lincoln, Nebraska. Supported in part by the National Science Foundation (Grants Nos. GB-1148 and GB-8280). Published with the approval of the Director as Paper No. 2639, Journal Series, Nebraska Agr. Exp. Sta. Most of the data were taken from a thesis submitted by the senior author to the University of Nebraska in partial fulfillment of the requirements for the M.S. degree.

2 Formerly graduate assistant in Agronomy, University of Nebraska (now graduate student in the Agronomy Department, University of Illinois); Research Geneticist, Crops Research Division, ARS, USDA; and Bert Rodgers Professor of Agronomy, University of Nebraska, Lincoln, Nebr., 68503, respectively.

Received for publication September 11, 1969.




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