Figure 4

FonSIX6 is expressed during the early stages of infection.

Reverse-transcriptase polymerase chain reaction analysis of watermelon actin (ACTIN) or FonSIX6 expression using RNA isolated from the roots of watermelon seedlings, which were either mock or Fusarium oxysporum f. sp. niveum inoculated and harvested on the 1^st, 2^nd, 3^rd, 4^th and 5^th day post-inoculation (DPI). Water was included as a negative control (−), while genomic DNA from Fusarium oxysporum f. sp. niveum (+) was used as a positive control.