Phenomena and Processes [G] » Physiological Phenomena [G07] » Growth and Development » Growth » Tropism » Gravitropism
Phenomena and Processes [G] » Plant Physiological Phenomena [G15] » Tropism » Gravitropism
Description
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) MeSH
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