Effects of soybean trypsin inhibitor and defense signaling compounds on the protective enzymes in Spodoptera litura larvae
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abstract
In this study, the second or third instars of euryphagous insect Spodoptera litura larvae were continuously fed with the diets containing soybean trypsin inhibitor (SBTI) for six generations, and the protective enzyme activities in the midgut and fatbody of the fifth instars of S. litura larvae were evaluated. SBTI inhibited the SOD and CAT activities, but the inhibition effect decreased with the increase of successive culture generation. On the other hand, SBTI promoted the POD activity significantly. Pre-exposure to methyl jasmonate and salicylate for 48 h had significant effects on the SOD, POD and CAT activities, and decreased the effects of SBTI on these protective enzymes activities significantly. These results suggested that S. litura could regulate its protective enzyme system and gradually adapt to protease inhibitors, while pre-exposure to volatile defense signaling compounds could enhance the adaptation of S. litura to plant defense proteins.
