Fig. 6

SYST2-VOCs reduced the wilt disease index by inducing systemic resistance. For in vitro assay, germinated seedlings were dipped in Rs culture and grown in larger plates having soil mixed with vermiculite as a medium for growth. Sterilized water was used as control (a1) while PGPR strain SYST2 (a2) and DH5α (a3) were inoculated in small plates. Wilt index was recorded after 14 days of inoculation after exposure to SYST2-VOCs (b) and synthetic VOCs (c). For in planta assay, the pots were inoculated with a suspension of Rs (at an OD of 0.1 at 600 nm) by dipping the roots in the suspension, except the non-inoculated control (d1), and then the seedlings were re-planted in the pots. Small agar plates at the bottom of jars were inoculated with SYST2 (d2), DH5α (d3), while only sterilized water was used as control (d4). Data was recorded after 21 days of inoculation after exposure to SYST2-VOCs (e) and synthetic VOCs (f)