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Published in Crop Sci 13:1-4 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Genetic Diversity on Heterosis in Tall Fescue1

J. B. Moutray, Jr. and R. V. Frakes2

The object of this study was to determine the extent of heterosis for plant height, anthesis date, panicle number, seed yield, and fall vigor rating in a tall rescue (Festuca arundinacea Schreb.) group selected for diverse morphology, origin, and anthesis date. Nine parents, nine single-cross progeny, and eight S1 progeny were included.

Single-cross progeny were superior to their parents in all characteristics except seed yield, while the parents exceeded their respective Sl's except in plant height.

Single crosses average 15, 28, and 5% above the midparent for plant height, panicle number, and seed yield, respectively, had a 3% earlier anthesis date, and were 23% lower in fall vigor rating (more vigorous). Single crosses averaged 6% above the high parent for panicle number and 10% below the low parent for fall vigor rating.

Crosses between maturity groups resulted in the greatest heterosis above the midparent for all characteristics. Crosses within the early maturity group were tallest (106% of high parent) and had the most vegetative vigor (115% of high parent).

Indications are that crosses between clones of diverse morphology, origin, and anthesis date can result in greater heterosis than has been observed in crosses between clones selected on similarities.

Key Words: Festuca arundinacea Schreb

1 Technical Paper No. 3175, Oregon Agricultural Experiment Station, Corvallis, Oregon, Western Regional Research Project W-40.

2 Research Assistant (now Alfalfa Breeder, Rudy-Patrick Company) and Professor of Plant Breeding, Department of Agronomic Crop Science, Oregon State University, Corvallis, Oregon.

Received for publication August 20, 1972.




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Copyright © 1973 by the Crop Science Society of America.