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Release of dormancy in sunflower embryos by dry storage: involvement of gibberellins and abscisic acid

Published online by Cambridge University Press:  19 September 2008

J. Bianco ,
G. Garello  and
M. T. Le Page-Degivry
J. Bianco
Affiliation:
Laboratoire de Physiologie Végétale, Faculté des Sciences, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
G. Garello
Affiliation:
Laboratoire de Physiologie Végétale, Faculté des Sciences, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
M. T. Le Page-Degivry*
Affiliation:
Laboratoire de Physiologie Végétale, Faculté des Sciences, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
*
* Correspondence
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Abstract

Excised Helianthus annuus L. embryos became dormant during the third week after anthesis. At this stage a short drying treatment (3 d) led to a slight improvement in germination but a 6-week dry storage caused a complete release from dormancy. The short drying treatment, however, elicited the embryos' response to an exogenous concentration of GAs which was unable to promote germination of fresh embryos. It therefore appeared that a short drying treatment changed the sensitivity to GAs but was not capable of directing embryo metabolism completely towards a germinative mode. Moreover, this drying treatment reduced considerably the ABA content in both the axis and the embryo. Nevertheless, no correlation could be established between germinability and the ABA content since the amount of ABA was not modified by the 6-week dry storage. The key step for predisposing the seeds to germinate is the suppression of the capacity for ABA synthesis in the axis, a suppression which takes place during 6-week dry storage.

Keywords

Sunflowerembryo dormancydrying treatmentabscisic acidGA sensitivity
Type
Research Papers
Information
Seed Science Research , Volume 4 , Issue 2 , June 1994 , pp. 57 - 62
Copyright
Copyright © Cambridge University Press 1994

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