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Oil production from oil palm is adversely affected by drought and salt. Under drought and salt stress, proline content increases in oil palm; the mechanism for this is unknown. Here, an 8319-nucleotide sequence including cDNA, genomic DNA and the promoter region of proline transporter gene from oil palm  Elaeis guineensis  was determined. The transporter gene exhibited high similarity to  Bet/ProT  genes from several plants, but the highest homology was found with rice  ProT1 . The exon–intron structure of genomic DNA was unique, and numerous stress-response  cis -elements were found in the promoter region. Expression of cDNA  EgProT1  in  Escherichia coli  mutant exhibited uptake activities for glycinebetaine and choline as well as proline. Under salt-stressed conditions, exogenously applied glycinebetaine was taken up into the root more rapidly than the control. These data indicate that oil palm has a unique  Pro/T1  gene. Nucleotide sequence data for the cDNA and genomic DNA of proline transporter gene from  Elaeis guineensis  are available in the DDJB database under accession numbers AB597035 and AB597036, respectively.

Isolation and characterization of proline/betaine transporter gene from oil palm