Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 6:180-182 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Morphological and Cytological Response of Pear Miller, Pennisetum typhoides to Thermal Neutron and Ethyl Methane Sulfonate Seed Treatments1

Glenn W. Burton and Jerrel Powell2

Three dosages each of thermal neutrons (TN) and ethyl methane sulfonate (EMS) were applied to 10 pearlmillet inbreds evaluated in replicated plots in the field. Both mutagens delayed seedling emergence and days to maturity, and reduced seedling height, plant height, leaves per culm, and selfed and sibbed seed set. EMS reduced percent emergence and plants per plot to reach maturity. This extra space allowed EMS-treated survivors to produce more culms and yield more. Two-thirds of the 56 sectorial mutants came from TN-treated seed. Significant inbred x treatment interactions were obtained for 5 of 13 characters studied. Frequencies of chlorophyll-deficient seedlings from selfed seed of all plants indicated that the 90-minute TN treatment and 0.4% EMS soak for 4 hours increased the average mutation frequency most (some 5 fold). Mutation frequency in inbreds varied greatly. The most effective EMS treatment induced over 8 times as many mutants in 1 inbred as in another. The 90-minute TN treatment produced 4 times as many plants (28%) with chromosome interchanges as the heaviest EMS treatment.

1 Cooperative investigations at Tifton, Ga., of the Crops Research Division, ARS, USDA, and the University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Experiment Station. This work was supported in part by the U. S. Atomic Energy Commission Contract No. AT-(40-1)-2976. The authors wish to acknowledge the assistance of Dr. D. K. Ourecky, Experiment Station, Geneva, New York, and Mr. James C. Fortson, Computer Center, University of Georgia, Athens, Georgia. Published with the approval of the Director as Journal Series Paper No. 215.

2 Principal Geneticist and Research Geneticist, respectively, Crops Research Division, ARS, USDA, and the University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Experiment Station, Tifton, Georgia.

Received for publication October 18, 1965.




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Environmental Quality		 The Plant Genome
Copyright © 1966 by the Crop Science Society of America.