Canadian Medical Guide > Biological Sciences > Biological Phenomena, Cell Phenomena, and Immunity > Plant Physiology > Tropism > Gravitropism Terms and Definitions

Gravitropism

Medical Definition:	The directional growth of organisms in response to gravity. In plants, the main root is positively gravitropic (growing downwards) and a main stem is negatively gravitropic (growing upwards), irrespective of the positions in which they are placed. Plant gravitropism is thought to be controlled by auxin (AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990)
Guide Notes:	directional growth of a plant in response to gravity
Also Called:	Geotropism

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