Identification and application of specific expression promoter of plant root

The invention discloses a method for regulating the expression of an exogenous nucleotide sequence in a plant body and a DNA (Deoxyribonucleic Acid) construct. The DNA construct contains a new nucleotide sequence of a specific expression promoter of a plant root. The invention further provides a method for preferentially expressing the exogenous nucleotide sequence in the plant root by using the specific expression promoter of the root, disclosed by the invention.