PubMed · 2026-03-25
Scientists review 30 years of research sparked by the discovery of the N gene in tobacco — the first plant immune receptor of its kind. This work has mapped out how plants detect viruses and mount a rapid defense, with clear pathways now toward engineering crops that can fight off disease on their own.
The N gene from Nicotiana glutinosa, cloned in the 1990s, was the first identified TIR-domain NLR immune receptor, establishing a landmark model used across plant, animal, and prokaryote immunity research for 30 years.
The N receptor confers resistance to tobacco mosaic virus by specifically recognizing the viral p50 helicase domain via an interacting partner protein, triggering a localized hypersensitive (cell death) response that halts viral spread.
Three decades of N-gene research have revealed conserved molecular networks governing NLR-mediated plant immunity, with direct applications proposed for engineering broad-spectrum disease resistance in crop species.
