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Published online 1 January 1973
Published in Agron J 65:56-59 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Germination of Dormant and Nondormant Rescuegrass Seed on the Thermogradient Plate1

Arnold L. Larsen, Dorothy P. Montgillion and Eltora M. Schroeder2

Dormant and nondormant rescuegrass (Bromus catharticus Vahl.) seed were tested on the two-way thermogradient plate to make a comprehensive comparison of their germination responses to alternating and constant temperatures within a range of 5 to 35 C. Nondormant seed germinated within 1 week at a constant temperature near 30 C and within 4 weeks over most of the temperatures above 15 C. Dormant seed did not germinate at constant temperatures. Moderate germination of dormant seeds was obtained at 4 weeks with alternating temperatures. Imbibition of dormant seed on 0.2% KNO3-moistened blotters improved germination slightly. Clipping off the distal end of the caryopsis of dormant seed produced substantial germination at 3 weeks, but only at alternating temperatures. The combination of KNO3 and clipping resulted in a germination response by dormant seed at almost the same temperature range favorable for germinating nondormant seed.

Key Words: Bromus catharticus Vahl. • Temperature requirements • Seed testing • Dormancy breaking

1 Contribution from a cooperative project between Market Quality Research Division, Agricultural Research Service and the Grain Division, Consumer and Marketing Service, U.S. Department of Agriculture.

2 Research Botanist and Research Technician, respectively, Seed Quality Investigation, Field Crop and Animal Products Research Branch, ARS, Plant Industry Station, Beltsville, Md. 20705, and Botanist, Federal Seed Laboratory, Consumer and Marketing Service, Agricultural Research Center, Beltsville, Md. A. L. Larsen is presently Director of the Colorado Seed Laboratory, Colorado State University, Fort Collins, Colo. 80521. Dorothy Montgillion is presently with Weed Investigations, Plant Science Research Division, ARS, Plant Industry Station, Beltsville, Md.

Received for publication April 17, 1972.




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Copyright © 1973 by the American Society of Agronomy.