Figure 2.

Expression patterns of SpNRT genes. (A) Relative expression level of SpNRT genes in various tissues determined by RNA-seq FPKM value. (B) Relative expression level of SpNRT genes response to salt stress determined by RNA-seq FPKM value. (C) Relative expression level of SpNRT gene response to ABA stress determined by RNA-seq FPKM value. Red means relative expression high and blue means lower. SpNRTs RNA-seq data downloaded from NCBI Sequence Read Archive (SRA) database were used to express profile analysis, all the data is listed in Supplementary Tables 4–7. FPKM (fragments per kilobase of transcript per million fragments mapped) value standardized by the Z-score method of every SpNRT gene was used to generate heatmaps by TopHat and Cuffilinks software.