Figure 1.
Illustration of the re-circulating hydroponic culture system to continuously trap root exudates.
The system was modified according to Hao et al [22].
Figure 2.
Effect of the root exudates collected from own-root bottle gourd, grafted-root watermelon and own-root watermelon on FON conidial germination.
Each treatment had three replications. Bars represent standard error for three replicates. Germination impact index = (The conidial germination number in treatment – Control)/Control. The different letters represent the significance between pairs of mean values at P≤0.05 according to LSD test.
Figure 3.
Effect of the root exudates collected from own-root bottle gourd, grafted-root watermelon and own-root watermelon on FON growth.
Figure 4.
Effect of the root exudates collected from own-root bottle gourd, grafted-root watermelon and own-root watermelon on FON growth.
Bars represent standard error for three replicates. Each treatment had three replications. Bars represent standard error for three replicates. Growth impact index = (The growth diameter in treatment – Control)/Control. The different letters represent the significance between pairs of mean values at P≤0.05 according to LSD test.
Figure 5.
The chromatograms detected by HPLC both in standard chemicals and root exudates.
The peaks from left to right in the Standards represent the following standard compounds: 1, gallic acid; 2, coumaric acid; 3, β-hydroxybenzoic acid; 4,chlorogenic acid; 5, vanillic acid; 6, caffeic acid; 7, syringic acid; 8, ferulic acid; 9, benzoic acid; 10, salicylic acid; 11, cinnamic acid. The peaks identified by HPLC in the root exudates collected from own-root bottle gourd, grafted-root watermelon and own-root watermelon were showed by the corresponding numbers.
Figure 6.
Effect of different concentrations of chlorogenic acid and caffieic acid on conidial germination of FON.
Values are the means of four independent tests with standards errors shown by vertical bars. Germination impact index = (The conidial germination number in treatment – Control)/Control.
Figure 7.
Effect of different concentrations of chlorogenic acid and caffieic acid on FON growth.
Values are the means of four independent tests with standards errors shown by vertical bars. Germination impact index = (The conidial germination number in treatment – Control)/Control.