Fig. 2.

Increase in a leaf and b root dry weight (mean % ± SE), and c change in root:leaf ratio (mean % ± SE) of Arabidopsis thaliana after 2 weeks of in vitro exposure to fungal volatiles. Data are shown as relative to control plants; an increase of 0% in plant weight or ratio corresponds to a similar weight or ratio as in control plants. Ci, Chaetomium indicum; Fo47,  Fusarium oxysporum 47; For,  F. oxysporum f.sp. raphani; Mp,  Mucor plumbeus; Pl,  Phoma leveillei; Rs,  Rhizoctonia solani; Ss,  Sclerotinia sclerotiorum; Tv,  Trichoderma viride; Ua,  Ulocladium atrum; Vd,  Verticillium dahliae; Vl,  Verticillium longisporum. Main effect of the volatile exposure was tested using one-sample Student’s t test (H₀ = 0), and difference of plant weight increase in response to volatiles of different fungal pathogenicity was tested using two-sample Student’s t test at α = 0.05. Asterisks indicate statistical differences with the respective control plants (*P < 0.05; **P < 0.01; ***P < 0.001) using one-sample Student’s t test (H₀ = 0)