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Increased Phytochrome Responsiveness and a High-Temperature Transition in Barnyardgrass (Echinochloa crus-galli) Seed Dormancy

Published online by Cambridge University Press:  12 June 2017

R. B. Taylorson  and
L. Dinola
R. B. Taylorson
Affiliation:
U.S. Dep. Agric., Beltsville, MD 20705
L. Dinola
Affiliation:
U.S. Dep. Agric., Beltsville, MD 20705
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Abstract

Dormant barnyardgrass seeds imbibed in darkness for 8 days at 38 C displayed a very low fluence response to phytochrome, and very little germination occurred in darkness. However, if seeds were imbibed at temperatures >42 C or exposed to 46 C for only 0.5 h, considerable germination was evoked in the absence of a light stimulus. It is proposed that the high temperatures caused a transition in dormancy from a light-requiring to a light-independent state. The finding may have relevance to field behavior of barnyardgrass seeds where burial could prevent reception of the required light stimulus.

Keywords

BarnyardgrassEchinochloa crus-galli (L.) Beauv. ♯3 ECHCGSeed ecologylow fluence response
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 335 - 338
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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