: MeSH: Gravitropism

Plant Physiological Phenomena > Tropism > Gravitropism

Physiological Phenomena > Growth and Development > Growth > Tropism > Gravitropism

Gravitropism

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)

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