SSPs regulated by mycorrhiza colonization and nodulation. A, Number of differentially expressed SSPs during nodule development at 4, 10, 14, and 28 dpi with rhizobia, and 8, 14, and 27 dpi with mycorrhizal fungi (adjusted P < 0.1). B, Venn diagram illustrating the number of commonly regulated SSPs between mycorrhiza and nodulation. SSPs were included if they were differentially expressed in just one of the treatments. C, Hierarchical clustering of the 107 commonly regulated SSPs from log2 fold changes were calculated based on the respective control samples, i.e. nonmycorrhizal or nonrhizobial.