The invention relates to the technical field of
gene engineering, in particular to a
nucleotide sequence for improving the differentiation efficiency of European spruce calluses, an
expression vector and application of the
nucleotide sequence, the
nucleotide sequence is a coding sequence of an AP2L2
gene, and the
expression vector comprises double-stranded
RNA composed of the nucleotide sequence and a reverse complementary sequence of the nucleotide sequence. The invention discloses the negative regulation effect of the AP2L2
gene in European spruce
callus differentiation for the first time, and the industrial problem that the differentiation efficiency is effectively promoted to be reduced through a specific
gene silencing technology is solved. The scheme is feasible in operation, remarkable in effect and suitable for large-scale breeding and production of improved forest varieties.