Significance of the Occurrence of Time Lags in the Transmission of Hydraulic Shock Waves through Plant Stems

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Abstract
Hydraulic shock waves were introduced into plants by pruning. These shock waves were monitored by a sap flux meter attached to the plant at some distance from the excision. The measured shock waves occurred a short time after pruning. An electrical analogy is proposed to explain the time lags. The analogy suggested that, in plants undergoing auto-oscillatory behaviour, there should be a time lag in the transmission of oscillations in sap flux along a stem. A plant undergoing auto-oscillatory water metabolism showed a time lag of this type.

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