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Published in Crop Sci 7:524-527 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Use of Self-Incompatibility to Produce Commercial Seed-Propagated F1 Bermudagrass Hybrids1

Glenn W. Burton and Richard H. Hart2

Many clones of bermudagrass exhibit a high degree of self-incompatibility. Most of these appear to be crosscompatible. Six superior clones set an average of six times more seed when mutually pollinated with the other five clones than when selfed. Four of the 15 diallel (mutual pollination) crosses involving these six clones tested in plots established from seed yielded as much (or more) forage as the best vegetatively propagated clone in the test. One clone, unrelated to the others, gave high-yielding hybrids and high general combining ability effects when crossed with the other five dories. Commercial F1 hybrid seed could be produced by harvesting all seed from a field vegetatively planted to alternate rows of two such clones. These clones may not yield enough seed, however, to make hybrid bermudagrass seed production competitive with alternate land uses in Arizona.

Key Words: Cynodon dactylon • commercial F1 hybrid seed • cross compatible • diallel crosses • mutual pollination • dry matter digestibility • general combining ability • specific combining ability

1 Cooperative investigations 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. 36.

2 Principal Geneticist, Crops Research Division, ARS, USDA, and the University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton; and Research Agronomist, Crops Research Division, ARS, USDA, Beltsville, Md. The authors gratefully acknowledge the assistance of Dr. R. S. Lowrey, Assistant Animal Husbandman, Coastal Plain Station, Tifton, Ga., for the digestible dry-matter determinations; the State Department of Agriculture for the chemical analyses; and Dr. N. W. Widstrom, Crops Research Division, ARS, USDA, Coastal Plain Station, for statistical advice.

Received for publication March 27, 1967.




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