Tukey’s test P ≤ 0.05, R2 = Coefficient of determination, **Significant at 1% level. Morphological abnormalities The inhibitory effect of extract was further manifested in the form of deformed Barasertib supplier adults
which emerged from the larvae fed on S. hydrogenans extract ITF2357 manufacturer supplemented diet. The deformed adults had crumpled and underdeveloped wings as well as were half emerged from pupa. These deformities in adults were recorded only at 400 and 800 μg/ml concentrations (Figure 2). Figure 2 Developmental stages of S.litura reared on control diet (a,c,f) and abnormalities in different stages fed on diet supplemented with different concentrations of ethyl acetate extract of S. hydrogenans (b,d,e,g,h). Food utilization assay The diet utilization experiments indicated significant effect of S. hydrogenans solvent extract on S. litura. As is apparent from Table 5, there was significant decrease in relative growth and consumption rate of S. litura as well as efficiency of conversion
Caspase phosphorylation of ingested and digested food. Diet supplemented with extract resulted in 13–49% reduction in RGR over the control (P ≤ 0.01). Food consumption rate reduced to half of that in control at highest concentration (P ≤ 0.01). Table 5 Effect of ethyl acetate extract of S. hydrogenans and azadirachtin on food utilization and feeding of S.litura Treatments Concentrations (μg/ml) RGR (mg/mg/day) (Mean ± S.E.) RCR (mg/mg/day) (Mean ± S.E.) AD (%) (Mean ± S.E.) Control 2.17 ± 0.07a 6.97 ± 0.39a 28.35 ± 1.05a
Streptomyces ethyl acetate extract 400 1.88 ± 0.03ab 7.29 ± 0.26a 30.00 ± 0.29a 800 1.66 ± 0.10b 6.99 ± 0.38a 51.96 ± 0.44b 1600 1.10 ± 0.11c 3.53 ± 0.29b 66.00 ± 1.33c f- value 26.45** 27.53** C1GALT1 416.91** R2 0.95 0.59 0.92 Azadirachtin 400 1.54 ± 0.20d 3.92 ± 0.80c 43.56 ± 9.37d 800 – - – 1600 – - – f- value – - – R2 – - – Mean ± SE followed by different letters with in a column are significantly different. Tukey’s test P ≤ 0.05, R2 = Coefficient of determination, *Significant at 5% level, **Significant at 1% level. A concentration dependent decrease in ECI and ECD was observed in the larvae of S. litura (Figures 3 and 4). The diet amended with extract caused 18–67% decline in ECI and 17–72% decline in ECD over the control. Approximate digestibility increased by 43% at 1600 μg/ml in comparison to control as shown in Table 5 (P ≤ 0.01). The reduction in diet utilization suggests that reduced growth and development might have resulted from both behavioral and physiological effects. It is likely that this decrease in consumption rate (RCR) could be due to the antifeedant nature of the extract and accounts for the majority of the decrease in growth rate (RGR). The Streptomyces extract also altered food utilization indices in S. litura and revealed less conversion of ingested (ECI) and digested (ECD) food to body biomass.