At harvest (at 15 wk) five strawberries were pooled together from each strawberry plant, 25 g of soil were aseptically taken from the first 1.27 cm off the top of the soil, and five random leaves were taken from each strawberry plant and placed into separate sterile stomacher bags. Based on the weight of sample (strawberry, soil or leaves), the appropriate amount of diluent (sterile buffered peptone water) was added to the sample for a ten-fold dilution. The contents
of stomacher bags were homogenized for 60 s in a laboratory stomacher (Seward 400C Stomacher) operating at 230 RPM. Aliquots (1.0-ml or 0.1-ml) of the homogenate or appropriate dilution
were surface-plated (in duplicate) on MacConkey agar (MAC; Difco,Becton Dickinson, Sparks, Md.). All inoculated agar plates were incubated at 35 ± 2 C for 24 h and pink bacterial colonies were
counted and recorded as CFU of E. coli/strawberry or gram of soil or leaves.
At harvest (at 15 wk) five strawberries were pooled together from each strawberry plant, 25 g of soil were aseptically taken from the first 1.27 cm off the top of the soil, and five random leaves were taken from each strawberry plant and placed into separate sterile stomacher bags. Based on the weight of sample (strawberry, soil or leaves), the appropriate amount of diluent (sterile buffered peptone water) was added to the sample for a ten-fold dilution. The contentsof stomacher bags were homogenized for 60 s in a laboratory stomacher (Seward 400C Stomacher) operating at 230 RPM. Aliquots (1.0-ml or 0.1-ml) of the homogenate or appropriate dilutionwere surface-plated (in duplicate) on MacConkey agar (MAC; Difco,Becton Dickinson, Sparks, Md.). All inoculated agar plates were incubated at 35 ± 2 C for 24 h and pink bacterial colonies werecounted and recorded as CFU of E. coli/strawberry or gram of soil or leaves.
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