Fig. 3.

Colonization of Plutella xylostella by different strains of Pseudomonas protegens (A) and Pseudomonas chlororaphis (B) after oral uptake. Second instar larvae were fed with pellets of artificial diet spiked with 4 × 10⁶ bacterial cells. Larvae were surface sterilized and homogenated after 5, 30 or 45 h and serial dilutions of homogenates plated on selective medium. Strains were isolated from roots (P. protegens CHA0, P. protegens K94.41, P. chlororaphis PCL1391 and P. chlororaphis PCLRT03) or from arthropods (P. protegens PPRAR03, P. protegens PPRAR04, P. chlororaphis PCLAR01, P. chlororaphis PCLAR03 and P. chlororaphis PCLAR04). For each time point, significant differences between strains are indicated with different letters on top of the boxplots (Dunn's test p < 0.05). Numbers at the bottom of boxplots indicate numbers of extracted larvae.