Fig 3. The knock-down of Spätzle and Dorsal independently by RNAi.

qRT-PCR analysis of cecropins on fat body, epidermis and hemocytes in P. xylostella after 36 h of RNAi. The relative expression levels of cecropins mRNA was different after treatments. The mRNA level of Px-cec1 was remarkably decreased in fat body, Px-cec2 in hemocytes, while Px-cec3 was dropped rapidly as compared to other tissues. Actin was used as an internal control. Each bar represents the mean ± S.E. (n = 3).