Timing and extent of hypersensitive response are critical to restrict local and systemic spread of Pepper mild mottle virus in pepper containing the L3 gene
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Amino acid changes in Pepper mild mottle virus (PMMoV) coat protein (CP) that enhance, decrease, or nullify the resistance-inducing activity in Capsicum plants carrying the L3 gene have been identified. In this study, molecular events underlying the L3-gene-mediated resistance were analyzed through the expression of hypersensitive response (HR)-related genes, HSR203J-Cc and HIN1-Cc, and defense-related genes, PR1-Cc and PR4b-Cc, upon infection with PMMoV CP mutants. The expression kinetics of the genes correlated with the degree of restriction of virus distribution in the inoculated leaves. The results suggest that the timing and extent of HR are critical factors to restrict virus spread both locally and systemically in L3-gene-mediated resistance.
Key wordsPepper mild mottle virus Capsicum chinense L3 gene Hypersensitive response Virus resistance
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