Induced Resistance in Solanum lycopersicum by Algal Elicitor Extracted from Sargassum fusiforme

Figure 2

Plant pathogen (S. lycopersicum cv. House Momotaro—P. infestans) interaction in the presence of algal product (AP) elicitor. Tomato (HM) plants were thoroughly sprayed with AP (1%) or H₂O and inoculated with 1 mL of P. infestans (race 1.2.3.4) spores (10⁶ spore/mL) 1 day later and kept in a humid chamber for another 24 h, and disease development was assessed daily from the 2nd day until the 14th day after the introduction. (a) Disease severity on S. lycopersicum leaves 7 dpi. Different letters indicate significant differences at (). (b) Percentage of infected leaves and disease severity of the AP- and H₂O-treated plants from 2nd dpi until 14th dpi. Disease severity was quantified in reference to (c). (c) Development of P. infestans 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 repeated experiments.

(a)

(b)

(c)