phototropism defined in 1951 yearphototropism - phototropism (HELIOTROPISM);
phototropism - Tropism in which stimulus is light. E.g. bending of stems of indoor plants towards a window. Brought about by increased elongation of cells in growth region at tip of stem on shaded side. Generally accepted that effect is due to greater concentration of auxin on that side than on side facing light but some recent evidence suggests as the explanation asymmetric distribution of some cofactor that influences auxin effect.
near phototropism in Knolik
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