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Cholodny–Went model
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In botany, the Cholodny–Went model, proposed in 1927, is an early model describing tropism in emerging shoots of monocotyledons, including the tendencies for the shoot to grow towards the light and th
Image of a monocot and dicot sprouting away from the earth, toward the sun
Image of a monocot and dicot sprouting away from the earth, toward the sun
Gravitropism
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Gravitropism is a coordinated process of differential growth by a plant in response to gravity pulling on it. It also occurs in fungi. Gravity can be either artificial gravity or natural gravity. It i
Cholodny–Went model
…in emerging shoots of monocotyledons, including the tendencies for the shoot to grow towards the light (phototropism) and the roots to grow downward (gravitropism). In both cases the directional growth is considered to be due to asymmetrical distribution of auxin, a plant growth hormone. Although the model has…
Example of gravitropism in a tree from central Minnesota. This tree has fallen over and due to gravitropism exhibits this arched growth.
Example of gravitropism in a tree from central Minnesota. This tree has fallen over and due to gravitropism exhibits this arched growth.
Gravitropism maintains vertical orientation of these trees. These trees, typical of those in steep subalpine environments, are covered by deep snow in
Gravitropism maintains vertical orientation of these trees. These trees, typical of those in steep subalpine environments, are covered by deep snow in winter. As small saplings they are overwhelmed by the snow and bent nearly flat to the ground. During spring growth, and more so as larger trees, gravitropism allows them to orient vertically over years of subsequent growth.
Banana fruit exhibiting negative geotropism.
Banana fruit exhibiting negative geotropism.