Abstract
Root-knot nematodes (RKN,Meloidogynespp.) are one of the most harmful pests in agriculture.Pasteuria penetrans, an obligate hyperparasite of RKN, is an effective biological control agent. However, little is known about the molecular mechanisms of interaction betweenP. penetransand the second-stage juvenile (J2) ofMeloidogyne incognita. Here, we used transcriptome sequencing to characterise the differential expression profiles between control J2 ofM. incognitaand J2 encumbered byP. penetransendospores. A total of 445 genes were found to be differentially expressed, including 406 up-regulated and 39 down-regulated genes. Thirty-seven putative immune-related genes encoding collagens, cytochrome P450, lysozymes and other active proteins were identified. Genes involved in the ‘biosynthesis of unsaturated fatty acids’ pathway and several core sets of immune effectors were up-regulated, indicating conserved immune mechanisms among different nematodes. Down-regulation of cytochrome P450-related genes might suggest a specific defence response ofM. incognitaencumbered byP. penetransendospores.
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