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Nature and utilization of seed reserves during germination and heterotrophic growth of young sugar beet seedlings

Published online by Cambridge University Press:  19 September 2008

A. Elamrani ,
P. Raymond  and
P. Saglio
A. Elamrani
Affiliation:
Station de Physiologie Végétale, Institut National de la Recherche Agronomique, Centre de Recherches de Bordeaux, BP 81, 33883 Villenave d'Ornon Cedex, France
P. Raymond
Affiliation:
Station de Physiologie Végétale, Institut National de la Recherche Agronomique, Centre de Recherches de Bordeaux, BP 81, 33883 Villenave d'Ornon Cedex, France
P. Saglio*
Affiliation:
Station de Physiologie Végétale, Institut National de la Recherche Agronomique, Centre de Recherches de Bordeaux, BP 81, 33883 Villenave d'Ornon Cedex, France
*
* Correspondence
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Abstract

The seed reserves of sugar beet (Beta vulgaris L.) are starch, located exclusively in the perisperm, and lipids, proteins and a small quantity of soluble sugars, located mainly in the cotyledons. It is shown that lipids are the main respiratory substrate used during germination whereas starch and remaining lipids are only hydrolysed after root extrusion, to sustain root and hypocotyl growth. By removing the perisperm during imbibition, it was demonstrated that lipids and proteins alone are sufficient for viable seedling development, though such seedlings grew less than those developing in the presence of perisperm. The utilization of seed reserves was followed during seedling development in the dark in various organs. At 20°C, the reserves were sufficient for 8 d of growth in the dark, the hypocotyl attaining a length of 5 cm. Specific problems relating to field establishment of sugar beet are discussed in relation to these results.

Keywords

seed reservesmobilizationearly growthBeta vulgarissugar beetgermination

Information

Type
Research Papers
Information
Seed Science Research , Volume 2 , Issue 1 , March 1992 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 1992

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