Abstract

Citation

Researchers should cite this work as follows:

• Israelsson, D. (2023). 1969-Israelsson-Johnsson-Phase-shift in Geotropic Oscillations a Theoretical and Experimental Study. SIMIODE, QUBES Educational Resources. doi:10.25334/3PRW-FY91

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Description

Israelsson, D. and A. Johnsson. 1969. Phase-shift in Geotropic Oscillations a Theoretical and Experimental Study.  Physiologia Plantarum. 22:  1226-1237.

See https://pubmed.ncbi.nlm.nih.gov/20925673/ . Accessed 18 March 2023.

The paper studies geotropical induced phase-shifts in circumnutations (turning) of Helianthus annus hypocotlys. Theory based on previous work suggest short gravitational stimulation in different phase positions of an oscillating hypocotyl. Experimental studies are performed to test the theoretical studies.

Abstract: Geotropically induced phase-shifts in circumnutations of Heliauthus annuus hypocotyls are studied. - Theoretical deductions from a previously developed theory for geotropical movements are made for the case of a short gravitational stimulation in different phase positions of an oscillating hypocotyl. - Experimental studies are performed to test the theoretical results. - The conclusions are drawn, that the theory mentioned can satisfactorily describe geotropically induced phase-shifts. A comparison with phase-shifts in photoperiodic systems is made.

Keywords: circumnutation, plant, turning, delay, differential equation, model, oscillation, first order