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A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy

Published online by Cambridge University Press:  20 January 2015

Diego Batlla  and
Roberto L. Benech-Arnold
Diego Batlla*
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE-Buenos Aires, Argentina
Roberto L. Benech-Arnold
Affiliation:
IFEVA/Cátedra de Cultivos Industriales, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE-Buenos Aires, Argentina
*
*Correspondence E-mail: batlla@agro.uba.ar
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Abstract

Temperature is a key factor affecting both dormancy and germination. In non-dormant seeds, when temperature is within the thermal range permissive for germination, it just regulates germination velocity, while in seeds presenting dormancy it can also be affecting dormancy level, dormancy termination and the expression of dormancy itself. This dual effect of temperature on dormancy and germination often leads to misinterpretation of obtained germination results and confounds the analysis of temperature effects in seed populations presenting some degree of dormancy. In the present paper we discuss the effect of temperature in the regulation of dormancy level and its implications in dormancy expression, as an attempt to construct a conceptual framework that allows distinguishing between the effects of temperature on dormancy and germination. Finally, we present examples of how a better understanding of these effects could help us to interpret the mixed effects of temperature on both processes during incubation of seeds presenting dormancy.

Keywords

base temperaturedormancy expressiondormancy inductiondormancy terminationfluctuating temperaturesgerminationtemperature
Type
Research Opinion
Information
Seed Science Research , Volume 25 , Special Issue 2: Seed Dormancy , June 2015 , pp. 147 - 158
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Copyright
Copyright © Cambridge University Press 2015 

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