Figure 1.

Plant pathogen (S. lycopersicum cv. House Momotaro—Oidium spp.) interaction in the presence of algal product (AP) elicitor. Tomato (HM) plants were spray-washed with AP (1%) or H₂O and introduced into a growth chamber containing Oidium spp. infected plants 1 day later, and disease development was assessed daily from the 6th until the 14th day after the introduction. (a) Disease severity on S. lycopersicum leaves 10 days after disease introduction. Different letters indicate significant differences at (P < 0.05). (b) Percentage of infected leaves and disease severity of the AP- and H₂O-treated plants from 6th until 14th day after pathogen introduction. Disease severity was quantified in reference to (c). (c) Development of Oidium spp. on S. lycopersicum leaves was marked from 0 (if the leaf was not infected) to 5 (if the leaf was fully infected) and this reference was made for this purpose accordingly. Three plants were used in each experiment. Results are the average of three independent experiments.