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Published in Crop Sci 7:670-672 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Induced Sterility and Assiciated Effects of Dimethylarsinic Acid Treatment of Pearl Millet1

Jerrel B. Powell and R. B. Taylorson2

We have further investigated dimethylarsinic acid because of its possible gametocidal activity, using the prolific-seeding pearl millet, Pennisetum typhoides (Burm.) Stapf and C. E. Hubb. Seed set, pollen stainability, chromosome pairing, length of tillers, and other characteristics were evaluated. Foliar-spray applications (183 grams per hectare) at early growth stages selectively modified floral structures, the gynoecium being the most sensitive. Multiple and intermediately modified pistils were observed in single spikelets. A significant increase in number of chromosome univalents in microsporocytes was associated with treatment dose and seed set was markedly reduced. No one causal factor was found to have a dominant influence on sterility, although selective interference with normal tissue differentiation and retarded cell elongation of floral structures played an important part.

Key Words: Pennisetum typhoides • Pollen stainability • Chromosome pairing • Flower abnormalities

1 Cooperative investigations at Tifton, Georgia, of the Crops Research Division, Agricultural Research Service. U.S. Department of Agriculture, and the University of Georgia College OF Agriculture Experiment Stations, Coastal Plain Station, Tifton. Journal Series Paper No. 61, University of Georgia College of Agriculture Experiment Stations. The authors wish to acknowledge support of this investigation in part by Ansul Chemical Company.

2 Research Geneticist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton; and Plant Physiologist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Plant Industry Station, Beltsville, Md.; respectively.

Accepted for publication May 4, 1967.






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