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Induction of thermodormancy in Avena sativa seeds

Published online by Cambridge University Press:  19 September 2008

F. Corbineau ,
M. Black  and
D. Côme
F. Corbineau*
Affiliation:
Université Pierre et Marie Curie, Laboratoire de Physiologie Végétale Appliquée, Tour 53, 1er étage, 4 place Jussieu, 75252 Paris cédex 05, France
M. Black
Affiliation:
Université Pierre et Marie Curie, Laboratoire de Physiologie Végétale Appliquée, Tour 53, 1er étage, 4 place Jussieu, 75252 Paris cédex 05, France
D. Côme
Affiliation:
Université Pierre et Marie Curie, Laboratoire de Physiologie Végétale Appliquée, Tour 53, 1er étage, 4 place Jussieu, 75252 Paris cédex 05, France
*
* Correspondence
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Abstract

Freshly harvested oat (Avena sativa L.) seeds are considered to be dormant because they are unable to germinate at relatively high temperatures (above 20°–25°C). This primary dormancy results partly from the structures surrounding or adjacent to the embryo (pericarp, testa and endosperm) and partly lies in the embryo itself. Incubation of imbibed dormant seeds at 30°C induces a thermodormancy which is expressed as germination in a narrower temperature range. Induction of thermodormancy is apparent after 3–8 hours at 30°C, is optimal after about 1–2 days at this temperature, but diminishes with longer treatment times. Although whole grains become more dormant as a result of such treatment, the embryos themselves become less dormant, therefore the tissues covering or adjacent to the embryos must have become more inhibiting or the embryos have become more sensitive to their inhibitory action. The germination and sensitivity to ABA or oxygen of embryos isolated from such seeds are no longer so dependent on temperature. The effect of high temperature on primary dormancy and induction of thermodormancy is discussed with reference to sensitivity to ABA and temperature.

Keywords

GerminationthermodormancyAvena sativatemperature dependencyabscisic acid sensitivity
Type
Research Papers
Information
Seed Science Research , Volume 3 , Issue 2 , June 1993 , pp. 111 - 117
Copyright
Copyright © Cambridge University Press 1993

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Footnotes

1

Permanent address: Division of Life Sciences, King's College London, Campden Hill Road, London W8 7AH, UK.

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