I have used the following code to plot the results of the Tukey test after my Anova analysis in R.
TukeyHSD(myANOVA, conf.level=.90)
TUKEY <- TukeyHSD(myANOVA, conf.level=.90)
plot(TUKEY , las=1 , col="black")
However, since the number of lines plotted is too large, I would like to have the significant ones highlighted or in red. I have seen