Lv. Thomas et Jwt. Wimpenny, COMPETITION BETWEEN SALMONELLA AND PSEUDOMONAS SPECIES GROWING IN ANDON AGAR, AS AFFECTED BY PH, SODIUM-CHLORIDE CONCENTRATION AND TEMPERATURE, International journal of food microbiology, 29(2-3), 1996, pp. 361-370
pH/sodium chloride (NaCl) gradient plates were used to investigate com
petition between Pseudomonas and Salmonella species. At 30 degrees C a
nd at particular NaCl/pH conditions the salmonellae inhibited growth o
f P.fluorescens and not P. putida. At 20 degrees C P. putida and not P
. fluorescens inhibited the salmonellae. The growth of the pure and mi
xed strains in agar plates with the pH/NaCl conditions was compared by
viable counts. Competition in pour plates at 30 degrees C was confirm
ed. At 20 degrees C, sub-surface growth of the salmonellae inhibited t
he P. putida. With surface growth this did not occur; the salmonellae
was slightly inhibited by the P. putida.