| Incubation duration  | 
    | 
  Controls  | 
  salicylic acid concentration (mg/L) | 
    
   
  | 50 | 
  200 | 
  400 | 
  800 | 
  1000 | 
    
   
  | 1h | 
  M ± SD | 
  259±1 | 
  264 ± 1 | 
  267 ± 1 | 
  269 ± 4 | 
  264 ± 1 | 
  271 ± 4 | 
    
   
  | p | 
  - | 
  0,4 | 
  0.009 | 
  0.02 | 
  0.3 | 
  0.01 | 
    
   
  | 3h | 
  M ± SD | 
  259 ± 1 | 
  270 ± 1 | 
  270 ± 1 | 
  271 ± 1 | 
  272 ± 6 | 
  273 ± 1 | 
    
   
  | p | 
  - | 
  0.01 | 
  0.01 | 
  0.01 | 
  0.02 | 
  < 10-3 | 
    
   
  | 24h | 
  M ± SD | 
  260 ± 1 | 
  326 ± 1 | 
  358 ± 1 | 
  372 ± 1 | 
  384 ± 1 | 
  386 ± 3 | 
    
   
  | p | 
  - | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
    
   
  | 1 Week  | 
  M ± SD | 
  259 ± 1 | 
  335 ± 9 | 
  364 ± 8 | 
  376 ± 6 | 
  395 ± 4 | 
  398 ± 7 | 
    
   
  | p | 
  - | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
  < 10-3 | 
    
   |