Plants in both natural and cultivated populations carry inherent disease resistance, but there are numerous examples of devastating plant disease impacts (see Irish Potato Famine, Chestnut blight), as well as recurrent severe plant diseases (see Rice blast, Soybean cyst nematode, Citrus canker).
Disease resistance is the host trait that prevents infection or reduces the number of pathogens, parasites and herbivores within or on a host.
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Salicylic acid plays a role in the resistance to pathogens by inducing the production of pathogenesis-related proteins.