dotplot shows only one term about enrichplot HOT 2 CLOSED

This is because in the dotplot only significant gene sets are plotted; and the significance in both your analyses are based on the value of p.adjust.

In your first code chunk, in which you called the gseKEGG function, you did NOT specify the argument pAdjustMethod, only pvalueCutoff = 0.05. Since by default pAdjustMethod = "BH", significance is thus based on Benjamini-Hochberg adjusted p-values (i.e. column p.adjust), and thus not the 'raw' p-values (column pvalue). Note that the qvalue is another, related metric!

As you can see, in your enrichKEGG result there is only 1 gene set that has a value of p.adjust that is smaller than 0.05! Namely: 0.007217305.

The same applies to your enrichGO analysis; you set indeed the argument pAdjustMethod = "BH", and as cutoff value pvalueCutoff = 0.05. Only 1 gene set has p.adjust <0.05, namely 0.04818641.

So: either set the argument pAdjustMethod to "none", or increase the value of the argument pvalueCutoff.

From ?enrichKEGG: pAdjustMethod -- one of "holm", "hochberg", "hommel", "bonferroni", "BH", "BY", "fdr", "none".

from enrichplot.

Ok I see, I had previously thought that dotplot was only relevant to kk.negative@result results, thank you!

from enrichplot.