Regulation of Picea abies seed dormancy by red and far-red light at various moisture contents

The effects of red (R), far-red (FR) and R + FR light on Norway spruce seed dormancy were studied at five different moisture contents (MC) between 5 and 20%. The degree of dormancy was studied by germinating seeds over a wide range of temperatures in the dark. The non-irradiated control seeds were s...

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Bibliographic Details
Published in:Scandinavian journal of forest research 1998, Vol.13 (1), p.43-49
Main Authors: Leinonen, K, Chantal, M. de (Helsingfors Univ. (Finland). Dept. of Forest Ecology)
Format: Article
Language:English
Subjects:
ARBOLES FORESTALES
ARBRE FORESTIER
ARTIFICIAL LIGHT
BESOIN EN LUMIERE
CONTENIDO DE HUMEDAD
DORMANCE
DORMANCY
DORMICION
FITOCROMA
FOREST TREES
GERMINACION
GERMINATION
light quality
LIGHT REQUIREMENTS
logit models
LUMIERE ARTIFICIELLE
LUZ ARTIFICIAL
MODELE
MODELOS
MOISTURE CONTENT
NECESIDADES DE LUZ
Norway spruce
PHYTOCHROME
PICEA ABIES
TENEUR EN EAU
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Summary:The effects of red (R), far-red (FR) and R + FR light on Norway spruce seed dormancy were studied at five different moisture contents (MC) between 5 and 20%. The degree of dormancy was studied by germinating seeds over a wide range of temperatures in the dark. The non-irradiated control seeds were shallowly dormant, only a proportion of them germinated and within a limited temperature range. Red light progressively stimulated germination between 5 and 17% MC, but this effect was reversed if a FR treatment followed, although all germination could not be inhibited by one FR pulse. Far-red light had a slightly stimulating effect at 19% MC. To generate seeds able to germinate over a wide range of temperatures in darkness, an artificial light pretreatment should be given to seeds at MC above 17% in order to receive maximum response.
ISSN:0282-7581
1651-1891
DOI:10.1080/02827589809382960