Gene-for-gene disease resistance: bridging insect pest and pathogen defense.
Active plant defense, also known as gene-for-gene resistance, is triggered when a plant resistance (R) gene recognizes the intrusion of a specific insect pest or pathogen. Activation of plant defense includes an array of physiological and transcriptional reprogramming. During the past decade, a large number of plant R genes that confer resistance to diverse group of pathogens have been cloned from a number of plant species. Based on predicted protein structures, these genes are classified into a small number of groups, indicating that structurally related R genes recognize phylogenetically distinct pathogens. An extreme example is the tomato Mi-1 gene, which confers resistance to potato aphid (Macrosiphum euphorbiae), whitefly (Bemisia tabaci), and root-knot nematodes (Meloidogyne spp.). While Mi-1 remains the only cloned insect R gene, there is evidence that gene-for-gene type of plant defense against piercing-sucking insects exists in a number of plant species.
Kaloshian
Isgouhi
I
Department of Nematology, University of California, Riverside, California, USA. isgouhi.kaloshian@ucr.edu
D000818:Animals; D017343:Genes, Plant / Q000502:physiology*; D006790:Host-Parasite Interactions; D007113:Immunity, Innate / Q000235:genetics*; D007313:Insecta / Q000502:physiology*; D007305:Insecticide Resistance / Q000235:genetics / Q000502:physiology; D010571:Pest Control; D010935:Plant Diseases / Q000235:genetics* / Q000469:parasitology; D010937:Plant Growth Regulators / Q000235:genetics / Q000502:physiology; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology
C117349:MI-1 protein, Lycopersicon esculentum; D010937:Plant Growth Regulators; D010940:Plant Proteins