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Plants have evolved complex defense mechanisms to withstand insect attack. Identification of plant endogenous insect resistance genes is of great significance for understanding plant-herbivore interactions and improving crop insect resistance. Soybean (Glycine max (L.) Merr.) is an important crop that is often attacked by the common cutworm (CCW) (Spodoptera litura Fabricius). In this study, based on our transcriptomic data, the gene GmVQ58, encoding a FxxxVQxxTG (VQ) motif-containing protein, was cloned and characterized. This gene showed the highest expression in the leaves and roots and was up-regulated significantly after CCW attack. Constitutive expression of GmVQ58 rescued the susceptibility of an Arabidopsis mutant to CCW, and interference of GmVQ58 in soybean hairy roots enhanced the resistance to CCW. Furthermore, GmVQ58 was localized to the nucleus and physically interacted with the transcription factor GmWRKY32. The expression of two defense-related genes, GmN:IFR and GmVSPβ, was up-regulated in GmVQ58-RNAi lines. Additionally, the promoter region of GmVQ58 was likely selected during domestication, resulting in different expression patterns in cultivated soybeans relative to wild soybeans. These results suggest that silencing GmVQ58 confers soybean resistance to CCW.

Knockdown of GmVQ58 encoding a VQ motif-containing protein enhances soybean resistance to the common cutworm (Spodoptera litura Fabricius)