intersection of RNA-seq data from different experiments

Question

[tiancaigg]

For example, I want to know the co-unregulated genes of Arabidopsis treated with different pathogens, can I just intersect their RNA-seq results? How can I join their p-values? Will this make statistical meaning?

[Arup Ghosh]

Why do you want to join p-values form different RNA-seq analysis results?

[Kevin Blighe]

Can you elaborate on "co-unregulated" genes? - genes that are going in opposite directions of effect in response to different pathogens? Why not just correlate the fold-changes, manually tabulate the results, or just something simple like that. Not everything has to have a pre-defined procedure.