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Phytochrome-mediated Amaranthus germination I: effect of seed burial and germination temperature

Published online by Cambridge University Press:  12 June 2017

Robert S. Gallagher  and
John Cardina
Robert S. Gallagher*
Affiliation:
Department of Soil, Crop, and Atmospheric Sciences, Cornell University, Ithaca, NY 14853
John Cardina
Affiliation:
Department of Horticulture and Crop Science, Ohio Agricultural Research and Development Center, Ohio State University, Wooster, OH 44691
*
Corresponding author. rsg9@cornell.edu
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Abstract

This research was conducted to evaluate the light requirement for redroot and smooth pigweed germination in soil, and how this requirement is affected by germination temperature and seasonal periodicity in seed dormancy. Seed enclosed in nylon mesh bags was buried in the field in December 1993 and 1994 and was recovered throughout the spring and summer of the following year, respectively. Germination was highest with red light or at 30 C. The requirement for red light was more pronounced at 20 vs. 30 C. The saturating fluence of red light was as low as 3 μmol m−2 in buried seed and 1,000 μmol m−2 in unburied control seed, depending on germination temperature. The effect of light and germination temperature pigweed germination also changed throughout the growing season. Our results indicate that light may be a requirement for germination in only the most dormant weed seed in the soil seedbank.

Keywords

Redroot pigweed, Amaranthus retroflexus L., AMAREsmooth pigweed, Amaranthus hybridus L., AMACHSeedbank dynamics seed germinationphytochromephotomorphogenesisAMAREAMACH

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 1 , February 1998 , pp. 48 - 52
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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