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Background  Phosphatidyl ethanolamine-binding proteins (PEBPs) are involved in the regulation of plant architecture and flowering time. The functions of  PEBP  genes have been studied in many plant species. However, little is known about the characteristics and expression profiles of  PEBP  genes in wild peanut species,  Arachis duranensis  and  Arachis ipaensis   ,   the diploid ancestors of cultivated peanuts.    Results  In this study, genome-wide identification methods were used to identify and characterize a total of 32 peanut  PEBP  genes, 16 from each of the two wild peanut species,  A. duranensis  and  A. ipaensis . These  PEBP  genes were classified into 3 groups ( TERMINAL FLOWER1 -like,  FLOWERING LOCUS T -like, and  MOTHER OF FT AND TFL1 -like) based on their phylogenetic relationships. The gene structures, motifs, and chromosomal locations for each of these  PEBPs  were analyzed. In addition, 4 interchromosomal duplications and 1 tandem duplication were identified in  A. duranensis , and 2 interchromosomal paralogs and 1 tandem paralog were identified in  A. ipaensis . Ninety-five different  cis -acting elements were identified in the  PEBP  gene promoter regions and most genes had different numbers and types of  cis -elements. As a result, the transcription patterns of these  PEBP  genes varied in different tissues and under long day and short day conditions during different growth phases, indicating the functional diversities of  PEBPs  in different tissues and their potential functions in plant photoperiod dependent developmental pathways. Moreover, our analysis revealed that  AraduF950M / AraduWY2NX  in  A. duranensis , and  Araip344D4 / Araip4V81G  in  A. ipaensis  are good candidates for regulating plant architecture, and that  Aradu80YRY, AraduYY72S,  and  AraduEHZ9Y  in  A. duranensis  and  AraipVEP8T  in  A. ipaensis  may be key factors regulating flowering time.    Conclusion  Sixteen  PEBP  genes were identified and characterized from each of the two diploid wild peanut genomes,  A. duranensis  and  A. ipaensis . Genetic characterization and spatio-temporal expression analysis support their importance in plant growth and development. These findings further our understanding of  PEBP  gene functions in plant species.

Molecular and transcriptional characterization of phosphatidyl ethanolamine-binding proteins in wild peanuts Arachis duranensis and Arachis ipaensis