Fig. 4
From: Use of ultrasonication to increase germination rates of Arabidopsis seeds
Effect of ultrasounds on the germination percentage of seeds of A. thaliana (Col-0) collected at different years before testing. 30 seeds were subjected to 45 kHz sonication at 24 °C for 30 s. Each point shows a mean of 30 independent samples. Vertical bars indicate standard error. Asterisks indicate significant differences respect to the control (the corresponding ultrasound untreated seeds) according to the t test (p < 0.05)