Gene ontology comparison between barley and tomato.

A -Based on the expression values of genes annotated to a GO term, GO terms were merged between barley and tomato. A principal component analysis of all GO terms matched was performed, comparing all replicates of barley root, barley shoot, tomato root, and tomato shoot tissue to each other. B–the square rooted expression level of barley and tomato tissues for significantly different GO terms, indicated by the fill color of the bars.