The growth tendency of a plant organ to grow at a specific angle to gravity rather than directly toward or away from it.
From geo- (Earth/gravity) + plagio- (Greek plagios, 'oblique' or 'slanting') + tropism (Greek tropos, 'turning'). This term emerged in early 20th-century plant biology to describe growth behaviors more complex than simple up-or-down responses.
A plant shoot doesn't always grow straight up—many grow at a 45-degree angle or horizontally because they're geoplagiotropic, responding to gravity in a slanted way! This is how vines and ivy can grow along walls instead of just upward to the sun.
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