FIGURE 7.
Interactive effects of red light and root knot nematode on ascorbate-glutathione pool in leaves and roots of watermelon plants. Glutathione and ascorbate contents were analyzed spectrophotometrically at 7 days post inoculation (dpi). Plants were kept in white light (WL, open column) or red light (RL, gray column) without (Mock) or with the inoculation of M. incognita (RKN). Data are the means ± SD of four replicates. Different letters indicate statistically significant differences (Duncan’s multiple range test with p < 0.05).