Fig. 2

Coexpression network analysis of nutrient deficiency response genes (NRGs). a Six modules extracted from coexpression analysis using 179 microarray data. The number in parentheses indicates the number of NRGs in each module. Red and blue nodes indicate transcription factor and nutrient transporter genes, respectively. b Expression profile of NRGs in each module in various organs and tissues at different developmental stages based on 143 microarray data previously obtained by Sato et al. (2011) from leaf blade (6 samples), leaf sheath (4) root (4), stem (3), panicle (3), anther (3), pistil (3), lemma and palea (6), ovary (4), embryo (5), and endosperm (5). The vegetative organ samples were obtained mainly at the maturity stage of development, whereas almost all reproductive organ samples were obtained during the immaturity stage (Details in Additional file 2: Table S2). We performed 75 percentile normalization with log2 transformation and the relative expression value (log2) was obtained by subtracting the median expression value within the data set for each probe