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Although it is well known that plants emit ultrasound bursts under drought stress, the exact origin of the acoustic waveform of these pulses has remained elusive. Here we present evidence for a correlation between the ultrasound spectrum of these pulses and the dimensions of the plant's xylem vessels. Using a model that relates the vibrational excitations of the vessels to their geometric and viscoelastic properties, we develop a methodology to extract the internal xylem vessel dimensions fromdoi:10.21203/rs.3.rs-452046/v2 fatcat:hnqgt7vlarbqtenq2c53zc6gce