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Harpin Xoo , encoded by the hpaG Xoo  gene of Xanthomonas oryzae pv. oryzae, is a member of the harpin group of proteins that induce pathogen resistance and hypersensitive cell death (HCD) in plants. We elaborated whether both processes are correlated in hpaG Xoo -expressing tobacco (HARTOB) plants, which produced harpin Xoo  intracellularly. Resistance to fungal, bacterial, and viral pathogens increased in HARTOB, in correlation with the expression of hpaG Xoo , the gene NPR1 that regulates several resistance pathways, and defense genes GST1, Chia5, PR-1a, and PR-1b that are mediated by different signals. However, reactive oxygen intermediate burst, the expression of HCD marker genes hsr203 and hin1, and cell death did not occur spontaneously in HARTOB, though they did in untransformed and HARTOB plants treated exogenously with harpin Xoo . Thus, the transgenic expression of harpin Xoo  confers nonspecific pathogen defense in the absence of HCD.

Expression of HarpinXoo in Transgenic Tobacco Induces Pathogen Defense in the Absence of Hypersensitive Cell Death

Expression of Harpin_Xoo in Transgenic Tobacco Induces Pathogen Defense in the Absence of Hypersensitive Cell Death