Figure 2

Successive activation of NCR genes during nodule development. (A) Expression level of the 334 NCR probe-sets (x-axis) at 0, 3, 4, 6 and 10 dpi. The y-axis scale is the same for all graphs and is 25,000 at maximum. (B) Heat map of the same expression data as in (A). (C) The ratios of NCR expression levels at 4 dpi, 6 dpi or 10 dpi compared to 14 dpi. For each time point, the genes were ordered from high ratio to low ratio. At 4 dpi, only few NCR genes are activated; at 6 dpi most are activated but not yet at maximum scale; at 10 dpi, nearly all NCR genes are activated at similar level to 14 dpi (ratio close to 1). (D) Heat map of the Pearson correlation of the NCR expression profiles at 0, 3, 4, 6, 10 and 14 dpi.