Based on the most conserved region of the MADS box, a pair of degenerate primers were designed and used to amplify the genomic DNA of groundnut (cv. JL 24). The results indicate that an amplified fragment, related to flower development, showed a high homology to the MADS-box protein of Arabidopsis thaliana. This study laid the foundation for obtaining the full length of the MADS-box gene in groundnut.