Fig. 2.

Effects of 1,8-cineole on growth of Nicotiana tabacum seedlings. a Effects on hypocotyl length and root length. N. tabacum seedlings were grown in the absence (control) or presence (cineole) of 440 μM of 1,8-cineole for 10 days, and the hypocotyl length (top) and root length (bottom) were measured. Each data point represents the average of 20 individuals that successfully germinated. Vertical bars represent standard errors. b Effects on the cell elongation and cell proliferation in the affected roots. N. tabacum seedlings were grown in the absence (control) or presence (cineole) of 440 μM 1,8-cineole for 10 days, and the sizes of matured cells (top) and mitotic index in the root apical meristem (bottom) were measured. For cell length (top), each point represents average value of 60 cells derived from more than 4 individuals. Vertical bars represent standard errors. For mitotic index, each point represents the average value from 8 (control) or 7 (cineole) individuals. Vertical bars represent standard errors. n.s.; not significant (P > 0.05), ***; P < 0.001, Student’s t-test