Summary
This screen house study examined how salicylic acid pre-treatment influences the nutritional quality of cowpea (Vigna unguiculata) across two varieties. Application of 0.5 and 1.0 µM salicylic acid significantly enhanced crude protein, minerals, vitamins and amino acid content at maturity, with the higher concentration (1.0 µM) producing the greatest nutrient gains; Ife-BPC variety consistently outperformed BBT-white across all measured parameters. The authors conclude that 1.0 µM salicylic acid may be a practical agronomic intervention to improve nutritional density of cowpea for human consumption and livestock feed.
Regional applicability
Whilst this study was conducted in Nigeria, the findings may have limited direct applicability to United Kingdom production systems, as cowpea is not a major UK crop. However, the methodology demonstrating how plant growth regulators can enhance nutrient density is relevant to ongoing UK research on improving nutritional quality of legumes and vegetables, and could inform breeding or agronomic strategies for other pulse and vegetable crops.
Key measures
Proximate composition (crude protein, fat, fibre); mineral elements (potassium, calcium, phosphorus, zinc, magnesium, molybdenum); vitamins (A, B1, B2, B3, B6, B9); amino acid profile
Outcomes reported
The study evaluated the effects of salicylic acid pre-treatment on proximate composition, mineral elements, vitamins, and amino acid profiles in two cowpea varieties grown in a screen house. Salicylic acid treatment significantly increased crude protein, fat, fibre, key minerals (potassium, calcium, phosphorus, zinc, magnesium, molybdenum) and vitamins (A, B1, B2, B3, B6, B9) compared to control plants.
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