What characterizes a necrotroph?

A necrotroph is characterized by its ability to kill host cells in order to obtain nutrients. This strategy involves producing enzymes and toxins that break down the plant tissue, leading to cell death. Once the host cells are dead, the necrotroph can then absorb the nutrients released from the decaying tissue.

This form of parasitism contrasts with other types of pathogenic relationships. For instance, certain pathogens may manipulate host cellular processes or coexist with the host without causing immediate harm, but necrotrophs distinctly rely on the death of host cells as a critical part of their life cycle and nutrient acquisition strategy. This aggressive method allows them to thrive in various environments, particularly in situations where the host plant may be stressed or weakened.