If a tobacco plant that shows gene-for-gene resistance to some fungi is killed by a smut fungus, the most likely explanation is that the plant's R genes did not match the fungus's

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The term "gene-for-gene resistance" refers to the interaction between a plant's R (resistance) gene and a pathogen's Avr (avirulence) gene. If a tobacco plant that shows gene-for-gene resistance to some fungi is killed by a smut fungus, it suggests that the smut fungus had a specific Avr gene that did not match the tobacco plant's R gene, allowing it to successfully infect and kill the plant. Therefore, the most likely explanation is that the plant's R genes did not match the fungus's Avr gene.

If a Tobacco Plant That Shows Gene-For-Gene Resistance to Some