PA 20, a semi-selective medium for isolation and enumeration of Pantoea ananatis.
A semi-selective medium, PA 20, was developed for the isolation and enumeration of Pantoea ananatis from plant material, specifically from onion seed. The medium has a pH of 8.0 and contains NH4H2PO4, K2HPO4, magnesium sulphate, NaCl, d (+) arabitol, crystal violet, bromothymol blue and thallium nitrate. All P. ananatis strains from a variety of hosts produced characteristic yellow colonies in 6-7 days at 25 degrees C. Plating efficiencies on PA 20 in comparison to nutrient agar ranged from 92 to 112%. Recovery from naturally infested and artificially contaminated onion seed was high, with an almost total reduction of saprophytes.
Goszczynska
Teresa
T
Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa. goszczynskat@arc.agric.za
Venter
Stephanus N
SN
Coutinho
Teresa A
TA
D003470:Culture Media; D019697:Onions / Q000382:microbiology; D020636:Pantoea / Q000254:growth & development / Q000302:isolation & purification*; D012639:Seeds / Q000382:microbiology; D012680:Sensitivity and Specificity
D003470:Culture Media