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Influence of Afterripening Temperature and Endogenous Rhythms on Downy Brome (Bromus tectorum) Germination

Published online by Cambridge University Press:  12 June 2017

D. C. Thill ,
R. D. Schirman  and
A. P. Appleby
D. C. Thill
Affiliation:
PPG Industries, Pullmam, WA (formerly Plant Physiol., Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Dep. Agron. and Soils, Washington State Univ., Pullman)
R. D. Schirman
Affiliation:
Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Dep. Agron and Soils, Washington State Univ., Pullman, WA 99164
A. P. Appleby
Affiliation:
Crop Sci. Dep., Oregon State Univ., Corvallis, OR 97331
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Abstract

Afterripening requirements and the possible occurrence of endogenously controlled germination rhythms in downy brome (Bromus tectorum L.) were investigated in the laboratory. Afterripening temperatures from 0 to 50 C, maintained for periods of 4 to 28 days, had little effect on the percentage and rate of downy brome germination when seeds were incubated at 15 and 20 C. However, at 30 C germination temperature, the percentage and rate of germination were significantly increased by short periods (4 to 7 days) of afterripening at 50 C. Similar results occurred at 20 to 40 C afterripening temperatures after 14 to 28 days exposure. In general, high temperature afterripening conditions (40 to 50 C) initially increased downy brome germination at 30 C incubation temperature, but prolonged exposure tended to decrease germination. No endogenously controlled germination rhythms were observed in downy brome caryopses.

Keywords

Accelerated afterripeningdormancy
Type
Research Article
Information
Weed Science , Volume 28 , Issue 3 , May 1980 , pp. 321 - 323
Copyright
Copyright © Weed Science Society of America 

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References

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