In a lab test, when leaves of an infected plant are placed in a culture plate adjacent to pathogenic bacteria, the bacteria die.This provides evidence that the plant is likely producing

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Phytoalexins are antimicrobial compounds produced by plants in response to pathogenic invasion. The fact that the pathogenic bacteria die when placed next to infected leaves suggests that the plant is producing phytoalexins, which are helping to protect it from the invading pathogen.

In a Lab Test, When Leaves of an Infected Plant