Fig. 1.

Genomic distribution of NCX genes. a Chromosomal localization of NCX family genes from Arabidopsis. Four out of the five Arabidopsis chromosomes (all except chromosome IV) were found to possess one or more gene(s) encoding NCX family proteins. Bars on chromosomes denote the genes and arrows below the gene names indicate the direction of transcription. b Genomic distribution of NCX family genes on rice chromosomes. Out of the 12 chromosomes of rice, 8 chromosomes possess genes encoding NCX proteins. Chromosome numbers are shown at the right of the chromosomes and the centromeric regions are indicated by ellipse in both rice and Arabidopsis. Events of duplication between AtNCX6 and AtNCX10 in Arabidopsis; and between OsNCX1 and OsNCX4 and OsNCX8 and OsNCX15 in rice are represented by dotted lines. Scale at the bottom represents 2 Mb for both the karyograms