Fig. 9

Correlation and clustering analysis of the CDK and CDKL genes of Arachis hypogaea. A The expression values in different tissues was used to determine Pearson’s pairwise gene correlations of the CDK and CDKL genes. Blue and red colors represent positive and negative correlations with significant p-values (p-value < 0.05), respectively. The color intensities are proportional to the correlation coefficients (r) B PCA based k-means cluster plots classified CDK group of genes into expression-based clusters in leaf tissues, root and nodules, floral organs. and pod, pericarp and seed. The optimal number of clusters in each case were determined using the NbClust package