Mapping of tomato iron uptake genes. A, LeIRT1, LeIRT2, and LeNRAMP3 were located on chromosome 2; B, LeNRAMP1 on chromosome 11; C, LeFRO-TC124302 on chromosome 3; D, LeFRO1 and LeFRO-TC129233 on chromosome 1. LeNAS (chloronerva) was previously fine mapped to chromosome 1 (Ling et al., 1996, 1999), and LeFER was fine mapped to chromosome 6 (Ling et al., 1996, 2002).