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Environmental Conditions Required for Germination of Prickly Sida (Sida spinosa)

Published online by Cambridge University Press:  12 June 2017

Jerry M. Baskin  and
Carol C. Baskin
Jerry M. Baskin
Affiliation:
School of Biol. Sci., Univ. of Kentucky, Lexington, KY 40506
Carol C. Baskin
Affiliation:
School of Biol. Sci., Univ. of Kentucky, Lexington, KY 40506
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Abstract

Various environmental factors were tested under laboratory conditions to determine their effects on germination of seeds of prickly sida (Sida spinosa L. ♯3 SIDSP). Neither freezing and thawing nor moist chilling at 5 C promoted seed germination. However, increasing the incubation temperature and subjecting seeds to wet-dry cycles enhanced germination; high temperatures were more effective than alternate wetting and drying. Shifting seeds from a lower to a higher temperature regime increased germination. Seeds shifted from 15/6, 20/10, 25/15, or 30/15 C to higher regimes of 20/10, 25/15, 30/15, 35/20, or 40/25 C germinated to greater percentages than did seeds kept continuously at the lower thermoperiods. With an increase in length of time seeds were at a lower temperature, there was an increase in the percentage that germinated after they were moved to a higher regime.

Keywords

Temperaturewetting and dryinghard seed coats
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 6 , November 1984 , pp. 786 - 791
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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