Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 25:1023-1025 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Three Chlorophyll-Deficient Mutants of Common Wheat1

N. D. Williams, L. R. Joppa, M. E. Duysen and T. P. Freeman2

Simply inherited chlorophyll-deficient mutants are useful in genetic and cytogenetic experiments as markers for specific chromosomes or chromosome sites and in studies of photosynthesis. Three chlorophyll-deficient mutant lines, CD2, CDS, and CD4, were obtained in the hexaploid wheat (Triticum aestivum L.) line ND496-25 by treating seed with ethyl methanesulfonate. Inheritance of mutant phenotype was studied in the F2 and F3 of crosses of the mutant lines with ND496-25. Allelism and linkage were studied in the F1, F2, and F3 of a diallel cross of the three mutant lines. Each of the mutant phenotypes appeared to be conditioned by a single recessive nuclear gene. Mutant genes of the three lines appeared to segregate independently. The CDS chlorina mutant was well expressed and easily classified from seedling emergence through maturity. The mottling phenotype of the CD2 and CD4 mutants could be classified only after heading. The CD4 mutant was poorly expressed in the greenhouse. The CDS mutant should be an excellent genetic marker and useful for studying photosynthesis. The CD2 and CD4 mutants should have limited usefulness as genetic markers.

Key Words: Ethyl methanesulfonate • Chemical mutagen • Allelism • Linkage • Triticum aestivum L.

1 Cooperative investigations of USDA-ARS and the North Dakota Agric. Exp. Stn., North Dakota State Univ., Fargo, ND 58105. Published with the approval of the Director, North Dakota Agric. Exp. Stn. as Journal article 1404.

2 NDW and LRJ, research geneticists, USDA-ARS; MED and TPF, professors, Dep. of Botany, North Dakota State Univ., Fargo, ND 58105.

Received for publication January 14, 1985.




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