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Estimation of base and optimum temperatures for seed germination in common crupina (Crupina vulgaris)

Published online by Cambridge University Press:  12 June 2017

Cindy Talbott Roché ,
Donald C. Thill  and
Bahman Shafii
Donald C. Thill
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83844
Bahman Shafii
Affiliation:
College of Agriculture, University of Idaho, Moscow, ID 83844
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Abstract

Thermal time models for predicting phenological development require an estimate of base temperature, an attribute not previously defined for common crupina, a Mediterranean winter annual introduced in western North America. The stage of seed germination was selected for estimating base temperature, because facilities were available for experiments over a range of constant temperatures and base temperature is relatively constant throughout the life cycle in other species. Achenes from three populations of common crupina, including two varieties, typica and brachypappa, were produced under uniform conditions. Cumulative germination was recorded at 12 h intervals for achenes in darkness and optimum moisture at 23 constant temperatures from 4 to 17 C. The time course of germination was best described by a logistic growth curve from which time to 50% germination was estimated. A parabolic model provided the best fit in a regression of germination rate (reciprocal of time to 50%) against the temperature gradient, yielding base and optimum temperatures of 1 and 10.5 C, respectively. Bootstrap confidence intervals indicated no significant difference in base and optimum temperatures in germination between the two varieties nor between two populations of var. typica of common crupina introduced in the northwestern United States.

Keywords

Common crupina, Crupina vulgaris Pers. CRUVUBase temperaturedevelopment rateweed biology
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 529 - 533
Copyright
Copyright © 1997 by the Weed Science Society of America 

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Footnotes

Current address: P.O. Box 897, Asotin, WA 99402; croche@clarkston.com

References

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