Figure 7.

Pearson correlation matrix of the recorded relationships between contents of selected endogenous compounds in stipe (A) and internode (B) explants (n = 6), and quantitative comparison of correlations recorded between them as a result of the Pearson’s correlation matrix analysis, with r > 0.8 and r < −0.8 (C,D). (A,B) The degree of pairwise correlation with respect to the Pearson correlation coefficients is displayed by the color gradient. Positive correlations are displayed in shades of blue, whereas negative correlations are given in shades of red. The corresponding pie chart shows the numbers of negative correlations (r < −0.8, in red) compared to numbers of positive correlations (r > 0.8, in blue) within the correlation matrices. (C) Comparison of percentages of the total numbers of positive (blue) and negative (red) correlations occurring within individual groups of compounds. (D) Percentage shares of correlations recorded between the groups of compounds. Abbreviations: Aux, auxins; CKs, cytokinins; GAs, gibberellins; INs, internode explants; PAs, polyamines; PhAs, phenolic acids; STs, stipe explants; SHs, stress hormones.