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Aspects of Seed Dormancy in Fall Panicum (Panicum dichotomiflorum)

Published online by Cambridge University Press:  12 June 2017

R. B. Taylorson
R. B. Taylorson*
Affiliation:
Plant Physiol., Agric. Res., Sci. Ed. Admin., U.S. Dep. Agric., Beltsville, MD 20705
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Abstract

Caryopses (seeds) of fall panicum (Panicum dichotomiflorum Michx.) have a dormancy that is not easily overcome. Although accelerated after-ripening for 4 weeks was partially successful in overcoming dormancy, a dark imbibition at 35 C for about a week was more effective and also interacted strongly with an accelerated after-ripening. In either case, activation of phytochrome by red irradiation was required to induce germination. Similarly, alternating temperatures allowed germination of red-treated seeds but constant temperatures did not. More seeds germinated in sealed flasks than in dishes. The enhancement of germination in sealed flasks appeared to be related to increased CO2 levels. The data suggested a multiple dormancy in fall panicum seeds. One dormancy, the most intense, was relieved by high-temperature imbibition. The residual dormancy was relieved by active phytochrome and alternating temperatures.

Keywords

Seed germinationafter-ripeningphytochromehigh-temperature imbibitionethylene
Type
Research Article
Information
Weed Science , Volume 28 , Issue 1 , January 1980 , pp. 64 - 67
Copyright
Copyright © 1980 by the Weed Science Society of America 

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References

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