What is the definition of induced resistance in plants?

Induced resistance in plants refers specifically to the phenomenon where a plant responds to an initial infection by one pathogen, leading to enhanced resistance against subsequent infections by other pathogens. This process is a form of acquired immunity and involves the activation of various defense mechanisms that may not be actively expressed in the absence of a threat.

When a plant is infected, it can trigger systemic changes, effectively priming it to respond more robustly if attacked again. This activated state enhances the plant’s ability to fend off other pathogens, making it a valuable strategy for improving plant health and increasing crop resilience.

The other definitions focus on different aspects of plant defense or modifications. The concept of natural defenses activated by environmental stress describes a more general response rather than specifically enhancing immunity through previous infections. Genetic modification involves altering a plant's DNA to provide resistance, which is distinct from the natural, acquired process of induced resistance. Lastly, resilience to pathogen-induced damage describes a plant's overall ability to withstand damage rather than specifically its enhanced resistance due to prior infections.