The present invention relates to transgenic plants having a regulatory nucleic acid sequence according to SEQ ID NO:1 to 3, whereby said sequence is integrated into the genome in a stable manner after the transformation thereof, or a fragment or derivative thereof and a nucleic acid sequence that is functionally connected to said nucleic acid sequence and codes for a gene product. The present invention also relates to methods for producing the inventive transgenic plants and the nucleic acid sequences according to SEQ ID NO:1 to 3. The regulatory nucleic acid sequence relates to polynucleotides which naturally allow for an essentially root-specific expression of a foreign gene in plants of the species <i>Arabidopsis thaliana</i>. |