Influence of ultrasound on germination, some biometric and physiological indices in Liquidambar styraciflua L.

This study evaluated the effect of ultrasound treatments on the percentage of germinated seeds and on seedlings during the first vegetation stages in Liquidambar styraciflua L. Seeds treated with ultrasounds at varied intensities of the electric current and acoustic -1A-0.44W/cm 2 (V1), 1.5A-0.97W/cm 2 (V2), 2A-1.74W/cm 2 (V3), 2.5A-2.72W/cm 2 (V4)were put to germinate together with a control variant V0.Compared to the control variant in which the percentage of germinated seeds (PGS) was 60%, the seeds treated with ultrasounds reached 76% in the variant V4 and 95% in the variant V1.Biometric parameters and physiological indices showed higher values in the seedlings from seeds treated with ultrasounds (maximum in V1).Evolution of the leaf area and the features of the seedlings were described by polynomial functions under conditions of statistical safety.The logistic function described with fidelity the evolution of the leaf area in each individual leaf and in each variant: the highest value of the correlation coefficient was in V1.