Tomato Defense to Oldium neolycopersici: Dominant OI Genes Confer Isolate-Dependent Resistance Via a Different Mechanism Than Recessive oI-2

Tomato Defense to Oldium neolycopersici: Dominant OI Genes Confer Isolate-Dependent Resistance Via a Different Mechanism Than Recessive oI-2

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Tomato powdery mildew caused by Oidium neolycopersici has become a globally important disease of tomato (Lycopersicon esculentum).To study the defense wonderstruck enchanted responses of tomato triggered by tomato powdery mildew, we first mapped a set of resistance genes to O.neolycopersici from related Lycopersicon species.An integrated genetic map was generated showing that all the dominant resistance genes (Ol-1, Ol-3, Ol-4, Ol-5, and Ol-6) are located on tomato chromosome 6 and are organized in three genetic loci.

Then, near-isogenic lines (NIL) were produced that contain the different dominant Ol genes in a L.esculentum genetic background.These NIL were used in disease tests with local isolates of O.neolycopersici in different geographic locations, demonstrating that the resistance conferred by different Ol genes was isolate-dependent and, hence, may be race-specific.

In addition, the resistance black sabbath purple logo mechanism was analyzed histologically.The mechanism of resistance conferred by the dominant Ol genes was associated with hypersensitive respo-nse, which varies in details depending on the Ol-gene in the NIL, while the mechanism of resistance governed by the recessive gene ol-2 on tomato chromosome 4 was associated with papillae formation.