Résumé
The
CDKA
gene is linked to the cellular control. This gene was isolated from coconut palm (
Cocos nucifera
L) and a detailed expression analysis was done during somatic embryogenesis. Analysis of the deduced amino acid sequence showed the most important residues to be conserved. The highest homology was with
Picea abies
(96% similarity). Expression of the putative
CnCDKA
gene steadily increased during embryogenic callus formation phase when embryogenic competence is attained. In situ hybridization specified the localization of the transcripts as being mainly in a few cell layers within the meristematic centres in embryogenic calli at 90 day cultures. Analysis of
CnCDKA
expression at different somatic embryo formation stages showed that the expression was decreased progressively with the lowest expression in germinated somatic embryos.