This experiment identified transcripts present or absent under gravitropic stimulation. That many of them were also present under mechanical perturbation was unexpected.
This space biology experiment had the unexpected result of precious little difference between peg growth at space gravity v. ground.
On first blush, it appears that although it has been known for 100 years that roots know "down" and leaves know "up" (etc.) - that the actual work to determine what part of that it is genetic knowledge" or memory of gravity versus dynamic adaptation to gravity/motion stimuli - must wait for experiments which can only be done in space.
Am I close, Nebullis?
There's a lot that is and can be done by increasing Gs by centrifugation. Most of the candidate genes and proteins that are involved in gravitropism are discovered this way. Plants are a good model to study tropisms. But gravity affects all living cells, not just plants and bacteria with flagella. It isn't so remarkable that something that has a definite physical effect on living organisms is part and parcel of what that organism is about.