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Recent experiments conducted in the International Space Station highlight theapparent periodicity of leaf oscillations and other biological phenomenaassociated with rhythmic variations of lunisolar forces. These events aresimilar to those occurring on Earth, but with greater effects over a shorterperiod of time. Among the possible disturbances, other than forced orself-existing oscillations, parametric resonances appear caused by a smallperiodic term; such is the case of fluids subjected to small periodicvariations in gravitational forces in microscopic or mesoscopic plant channelsfilled with sap and air-vapor. The interface instabilities verify a Mathieu'ssecond order differential equation resulting from a Rayleigh-Taylor stabilitymodel. These instabilities appear during the Moon's rotation around the Earthand during the revolution of the International Space Station. They createimpulses of pressure and sap movements in the network of roots, stems andleaves. The model can explain the effects of the lunar tide on plant growth.The eccentricity of the lunar orbit around the Earth creates an importantdifference between the apogee and perigee of the Moon's trajectory andtherefore the tidal effects can depend on the distance between the Moon and theEarth.

Influence of lunisolar tides on plants. Parametric resonance induced by periodic variations of gravity