Fig. 4

Comparison of specific ACR distributions detected in diploids and autotetraploids with other epigenomic marks in the rice genome. a Correlogram of ACRs in 2 × and 4 × and other epi-marks with transcriptional regions. The Spearman coefficient is indicated by the color and size of each point. Red represents high correlation, and blue represents low correlation. In detail, the radar map shows the positive correlations of ACR with active epigenetic marks and the negative correlations with silent marks. b Average genome-wide occupancies of H3K36me2 (top row) and H3K36me3 (bottom row) in 2 × and 4 × rice leaves. The 2-kb upstream and downstream flanks are aligned. c Venn diagram of H3K36me2- and H3K36me3-marked genes in diploid and autotetraploid rice (top row) and percentages of the two marks associated with the four types of genes defined in Fig. 3d. d Profile of ACR density within only H3K36me2 (top row) and H3K36me3 (bottom row)-marked genes in 2 × and 4 × rice. e, f Box plots of the methylation levels (e) and transcriptional level (f) of genes marked by H3K36me2 and H3K36me3. Asterisks indicate significant differences at a P value < 0.05 by Wilcoxon rank sum test. The five statistical values of the boxplot from top to bottom are the maximum, third quartile, median, first quartile, and minimum. The centerline is the median, the box limits are the upper and lower quartiles, and the whiskers are the 1.5-times interquartile ranges. ns not significant