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The causal agent of pine wilt disease, pine wood nematode (PWN) ( Bursaphelenchus xylophilus ), revealed extended lifespan at low temperature. To discover the molecular mechanism of this phenomenon, we attempted to study the molecular characterization, transcript abundance, and functions of three genes of the cyclic guanosine monophosphate (cGMP) pathway from B. xylophilus . Three cGMP pathway genes were identified from B. xylophilus . Bioinformatic software was utilized to analyze the characteristics of the three putative proteins. Function of the three genes in cold tolerance was studied with RNA interference (RNAi). The results showed that the deduced protein of Bx-DAF-11 has an adenylate and guanylate cyclase catalytic domain, indicating an ability to bind to extracellular ligands and synthesizing cGMP. Both Bx-TAX-2 and Bx-TAX-4 have cyclic nucleotide-binding domains and ion transport protein domains, illustrating that they are cGMP-gated ion channels. The transcript level of Bx-daf-11 , Bx-tax-2 , and Bx-tax-4 increased at low temperature. The survival rates of three gene silenced B. xylophilus revealed a significant decrease at low temperature. This study illustrated that the cGMP pathway plays a key role in low-temperature-induced lifespan extension in B. xylophilus .

Low Temperature Extends the Lifespan of Bursaphelenchus xylophilus through the cGMP Pathway