Figure 4.

Larval weight gain of T. ni feeding on various Arabidopsis ecotypes infiltrated with isogenic virulent and avirulent strains of Psm ES4326. As described in “Materials and Methods,” lower leaves were inoculated with 10 mm MgSO₄ or with Psm ES4326(pLAFR3), Psm ES4326(avrRpt2), or Psm ES4326(avrB). Four days later, the inoculated leaves were removed and newly hatched T. ni larvae were placed on the upper leaves. Larval weight gain was measured after 5 d of feeding. For each experiment, weight gain data were normalized to the weight gain of larvae feeding on wild-type Col plants inoculated with 10 mm MgSO₄. The bars represent the least square means (±ses, ANOVA) of the relative larval weight gain data from three independent experiments. The numbers above each bar correspond to the Bonferroni adjusted P values from multiple t tests. For each ecotype, weight gain of T. ni larvae feeding on bacterial infected plants were compared with that on MgSO₄-treated plants of the same ecotype. ns, Not significant; P > 0.05, * 0.01 < P < 0.05, ** P < 0.01.