Originally Posted by Lagniappe

It's so odd that this thread was linked back to today. I found an article early this morning and wanted to look this thread up to post my reply, but got too busy.
In an article concerning plant parasites: "Plants often use small RNA molecules as messengers between different parts of [the plant]. Findings have shown that RNA can travel from a graft into the rest of the plant, affecting leaf shape, and helping the parasite synchronize it's life cycle with that of the host plant.
Is this relevant? Could this be what's going on in these grafts?