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Table 3 Effect of temperature, pH, light and enzymatic treatments on the antifungal activity of culture supernatant of Streptomyces sp. MR14

From: Biocontrol and plant growth promoting potential of phylogenetically new Streptomyces sp. MR14 of rhizospheric origin

Treatment Streptomyces sp. MR14
Zone of inhibition (mm) against F. moniliforme Residual activity (%)
Control (untreated) 35.0 ± 0.0 100.0
Heat treatment
 37 °C, 1 h 35.0 ± 0.1 100.0
 50 °C, 1 h 34.0 ± 0.2 97.14
 70 °C, 1 h 27.0 ± 1.0 77.14
 100 °C, 1 h 18.0 ± 0.5 51.42
 121 °C, 45 min 0.0 ± 0.0 0.0
Low temperature treatment
 − 20 °C, 1 h 35.0 ± 0.1 100.0
Enzymatic treatment
 Proteinase K 34.0 ± 0.0 97.14
Photostability
 Sunlight, 1 h 15.0 ± 0.5 42.85
 UV light, I h 34.0 ± 0.1 97.14
pH tolerance
 pH 2.0 33.0 ± 0.5 94.28
 pH 14.0 20.0 ± 1.0 57.14
  1. Values represented as mean ± S.D (n = 3)