Figure 1

Phylogenetic tree of the oligopeptide transporter (OPT) genes among rice and other species, based on amino acid sequences. The tree was drawn according to results generated by MEGA4.0 analysis using the neighbor-joining method with an amino acid and Poisson correction model. Bootstrap values calculated for 1,000 replicates are indicated at corresponding nodes. The groups with the cycles were functionally demonstrated to transport oligopeptides and the groups with the triangles were experimentally demonstrated to transport metal compounds. Locus IDs of OsOPT genes from rice are given in Table 1, and gi numbers of OPTs from other species are given as: AfOPT1, gi|20145239|; AtOPT1, gi|9758213|; AtOPT2, gi|15218331|; AtOPT3, gi|18414644|; AtOPT4, gi|9759417|; AtOPT5, gi|4938497|; AtOPT6, gi|4469024|; AtOPT7, gi|3600039|; AtOPT8, gi|9759191|; AtOPT9, gi|9759190|; AtYSL1, gi|41352037|; AtYSL2, gi|41352039|; AtYSL3, gi|9759194|; AtYSL4, gi|41352041|; AtYSL5, gi|41352043|; AtYSL6, gi|41352045|; AtYSL7, gi|41352047|; AtYSL8, gi|41352049|; BjGT1, gi|30722286|; NcHYPO1, gi|9368956|; ZmYSL1, gi|10770865|; CaOPT1, gi|2367386|; ScOPT2, gi|6325452|; SpISP4, |19112445|.