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Nilaparvata lugens proclotting enzymes ( Nl PCEs) belong to the clip domain serine protease (clip-SP) family, which is a characteristic protease family in arthropods. NlPCE3 was previously reported to regulate egg production and development in female N. lugens , but its role in male N. lugens is unclear. In the present study, qPCR analysis showed that NlPCE3 was expressed in three different tissues (gut, testis and fat body). RNAi revealed that ds NlPCE3 injection made the male vas deferens thinner and reduced the oviposition level of the females that mated with ds NlPCE3 -treated males, causing eggs not to hatch. Furthermore, immunofluorescence staining showed that Nl PCE3 was widely expressed in the male internal genitalia. However, after ds NlPCE3 injection, expression of Nl PCE3 was diffuse in the male internal genitalia, whose peripheral cells seemed degraded. Overall, these results indicate that NlPCE3 is important for reproduction in male N. lugens .

PCE3 Plays a Role in the Reproduction of Male Nilaparvata lugens