Fig. 6
Effects of pure volatile compounds on the root growth of tomato seedlings using modified root Y-tube olfactometers. a Percentages of tomato primary roots growing in the control arm or the treatment arm 14 days after sowing. Control versus control was used as a negative control. Twenty root olfactometer replicates were performed. Choices of primary roots were analysed with binomial tests (H0 = 0.50). Asterisk indicates pairwise differences between the control and 6-PP choices. b Length of the primary root. c Total root dry weight. Asterisks (*) indicate significant differences derived from Student t test at P = 0.05