Computer simulation of circumnutations--behaviour under different g's and comparison with experiment.
The influence of different g-forces on helical growth movements--circumnutation--of sunflower seedlings is treated. Predictions from a model, describing the movements as geotropic overshoot movements, are given. Results from tests of the assumptions are given. These results as well as results in the literature do not contradict the model. The need for more precise centrifuge tests under otherwise free fall conditions is emphasized.
Johnsson
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Institute of Physics, University of Trondheim/NLHT, N-7000 Trondheim, Norway.
Hestnes
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D003198:Computer Simulation; D006112:Gravitation; D018522:Gravitropism / Q000502:physiology*; D018470:Gravity, Altered; D006368:Helianthus / Q000254:growth & development* / Q000502:physiology; D018546:Hypocotyl / Q000254:growth & development / Q000502:physiology; D008954:Models, Biological; D018547:Plant Stems / Q000254:growth & development / Q000502:physiology