Molecular, genetic and biochemical strategies: rice's arsenal against gall midge

Rice gall midge (Orseolia oryzae) (RGM) poses a significant threat to rice production across Asia, causing yield losses through the formation of galls or silver shoots, which inhibit normal panicle development. Understanding the molecular mechanisms underlying resistance to RGM infestation is critical for developing sustainable pest management strategies. Resistance in rice is governed by Gm genes, which encode proteins that recognise specific RGM effectors and activate downstream defense pathways. Key molecular mechanisms include the hypersensitive response, salicylic acid and jasmonic acid signalling, reactive oxygen species production and the activation of pathogenesis-related (PR) proteins. Additionally, RGMs deploy effectors to manipulate host physiology and suppress plant defenses, leading to a dynamic coevolutionary arms race between the pest and its host. Advances in omics technologies, including transcriptomics and CRISPR-based gene editing, have provided insights into resistance pathways and facilitated the development of resistant rice varieties through gene pyramiding and marker-assisted selection. This review synthesises current knowledge on the molecular interactions between rice and RGM, highlighting strategies to increase resistance and ensure long-term agricultural sustainability.