PRODH and infection: Although there is no direct evidence to show the extent of plant enzymes contributing to the resistance at the infection site because they are interacted by various factors and encoded by multigene family, a previous considerable research provided corroborative evidence that plant chitinase and β-1,3-glucanases in plant self-defense mechanism (Figure 7) illustrate how optimum NPK nutrients might either mutate the production of glucanase, chitinase, POX, and PAL activities or be involved in secondary metabolite profiling for basal resistance in oil palm.