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A gene expressed preferentially in the globular stage of somatic embryogenesis encodes elongation-factor 1 alpha in carrot.

We have isolated cDNA of genes that are preferentially expressed during somatic embryogenesis of carrot (Daucus carota L.) by differential screening of globular embryos and cells that are dividing in an unorganized manner. As a result of Northern-blot analysis, one of the genes identified in this way, which we refer to as CEM1, was found to be expressed at high levels in somatic embryos at the globular and heart-shaped stages. In-situ hybridization using globular embryos revealed that the mRNA transcribed from CEM1 was located preferentially in the spherical region of the globular embryo. A homology search using the amino acid sequence deduced from the nucleotide sequence of the CEM1 cDNA revealed that CEM1 encodes the eukaryotic translational elongation-factor 1 alpha.