PR₄ protein is related to:

Correct option is D

Pathogenesis-Related (PR) proteins are a diverse group of proteins produced by plants in response to pathogen attack or environmental stress. These proteins play a vital role in plant defense mechanisms.
�� Why (d) Fungal Growth Inhibition is the Correct Answer:
PR₄ (Pathogenesis-Related Protein Group 4):
· PR₄ proteins belong to a class of antifungal proteins produced during systemic acquired resistance (SAR) in plants.
· They are induced by fungal infection, pathogen-associated molecular patterns (PAMPs), or elicitors.
Function:
· Fungal growth inhibition is the primary role of PR₄ proteins.
· While some PR₄ proteins have weak chitinase-like domains, most of them act independently of enzymatic activity.
· They interfere with fungal cell wall development, disrupt hyphal elongation, or alter membrane integrity, thereby limiting fungal invasion.