TABLE 2.
Interaction means of high population levels of Listeria monocytogenes on apple plugs in the presence of different antagonists and stored at 10 or 25°C over 7 days
| Antagonist | Population (log CFU/plug) after indicated storage time at 10 or 25°Ca
|
|||||||
|---|---|---|---|---|---|---|---|---|
| 10°C
|
25°C
|
|||||||
| 0 | 2 | 5 | 7 | 0 | 2 | 5 | 7 | |
| None | 5.3 a z | 5.8 a yz | 5.7 a y | 5.5 a yz | 5.3 a y | 6.1 a y | 6.1 a y | 5.7 a y |
| Gluconobacter asaii (T1-D1) | 5.3 a yz | 5.4 a y | 5.4 bc yz | 5.0 b z | 5.3 a y | 5.4 a y | 3.2 c z | 0 |
| Candida sp. (T4-E4) | 5.4 a y | 5.5 a y | 5.2 c y | 5.2 ab y | 5.4 a y | 5.7 a y | 2.0 c yb | 0 |
| Discosphaerina fagi (ST1-C9) | 5.3 a yz | 5.6 a yz | 5.8 ab y | 5.2 ab z | 5.3 a y | 5.5 a y | 4.9 b y | 2.1 abb |
| Metschnikowia pulcherrima (T1-E2) | 5.3 a x | 5.5 a yz | 5.5 b y | 5.3 ab yz | 5.3 a y | 5.5 a y | 5.1 ab | 3.9 b z |
Plugs were inoculated with L. monocytogenes at 108 CFU/ml. Means within columns with different letters (a, b, c) are different at the 0.05 significance level. Means within rows with different letters (x, y, z) are different at the 0.05 significance level. To correct variance heterogeneity the variance grouping technique was used. The analysis was done separately for 10 and 25°C. For 10°C, Log CFU values were analyzed as a two-factor general linear model with treatment and storage time as the factors. For 25°C, the 18 treatment × storage time means with at least one nonzero log CFU value were analyzed as a one-factor general linear model with Listeria-storage time coded as the treatment. The result was statistically significant (F = 7.350, P = 0.02, df = 17).
Treatment mean not different from zero at the 0.05 significance level.