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STUDIES on the mechanism by which auxin exerts its growth-promoting action on plant cells have indicated that, although ultimately detectable on the cell-wall, the effect is exerted in the first ...

Caption Effect of auxin on plant cells with regard to the transcriptional regulators "MONOPTEROS" and "BODENLOS": MONOPTEROS (MP) controls its own expression and the expression of its inhibitor ...

Auxins have the opposite effect in roots. This is negative phototropism. In a root the shaded side contains more auxin but grows less. This causes the root to bend away from the light.

However, certain bacteria can hack this system. Another key player in this evolutionary back-and-forth are plant hormones ...