A Review of Enzymes Associated with the Development of African Palm Weevil (Rhynchophorus phoenicis) in Palms of Niger Delta, Nigeria

The African palm weevil (Rhynchophorus phoenicis) is a coleopteran insect of significant economic and nutritional importance in palm-growing regions of West and Central Africa. It is an important edible insect highly valued for its nutritional and cultural relevance in the Niger Delta. Growing interest in domesticating and rearing this species has increased the need to understand the biological and biochemical processes that drive its development. This review brings together existing research to examine the major digestive and metabolic enzymes that enable R. phoenicis larvae to efficiently feed, digest palm tissues, and sustain rapid growth. Studies on R. phoenicis and related Coleopteran insects consistently identify a diverse array of digestive enzymes, including cellulases, hemicellulases, pectinases, amylases, glycoside hydrolases, and carboxypeptidases, enabling efficient utilization of lignocellulosic and protein components of palm tissues. Structural and protective functions are supported by enzymes such as chitin synthase and laccase, which contribute to cuticle integrity, gut protection, and stress tolerance. Neuropeptide signaling pathways expressed in the gut further regulate feeding behavior, digestion, and nutrient allocation. Collectively, these metabolic features reflect a highly specialized yet flexible digestive system that promotes rapid larval growth and resilience. Understanding these physiological mechanisms provides a scientific basis for optimizing diet formulation, improving mass-rearing efficiency, and advancing the sustainable domestication of R. phoenicis as a valuable food and feed resource.