Figure 4.

Low nutrient conditions promote recognition. Seven day-old Col-0 seedlings grown at 0.10x (white) or 1x (gray) MS were treated with exudates from Col-0 (KIN) or LA-1 (STRANGER) plants also grown at 0.10x or 1xMS (indicated on x-axis). MOCK seedlings were treated with the same agar overlay without the exudate. Seedlings were scored for lateral root number after an additional 11 d of growth. Results are expressed as the mean lateral root number of each sample (n = 30) +/− one standard deviation. Different letters indicate statistically significant differences samples based on Tukey's post-hoc test (p-value < 0.05).