An assessment of the relationship between seed nutritional components and resistance of maize to Sitophilus zeamais.

Maize is the mainstay of food and animal feed globally. Maize weevil, Sitophilus zeamais, accounts for a significant global loss of stored maize annually. Twenty-one maize genotypes were evaluated for their reaction to attack by maize weevil during storage and the influence of nutritional contents on their response to the weevil attack. Fifty grams of whole grains of each genotype were infested in three replications with 20 unsexed weevils in a 250 ml test tube and kept under ambient conditions for 36 days. The nutritional attributes of the maize genotypes were determined. Genotype TZB-SR-A had the thickest (7.32 mm) grains, while TZEE-WSTR had the thinnest grains (3.46 mm). Crude protein ranged from 8.43 to 12.78% for NG/SA/07/029 and TZB-SR-B, respectively. Beta-carotene ranged from 38.91 to 51.22% for Igbogbo Local and EVDT-Y2000-STR, respectively. Genotypes TZM-212, TZM-1296, TZB-SR-B, and TZM-1311 showed no appreciable loss in grain weight, while EVDT-Y2000-STR, which had the highest beta-carotene content, showed the highest weight loss of 2 g. These indicate sufficient differences among the maize genotypes for improvement for weevil resistance. Furthermore, the findings of the present study suggest a potential role of beta-carotene in influencing the feeding preference of S. zeamais on maize grains. Genotypes TB87/97/15, TZB-SR-A, TZB-SR-B, TZM-1311, and TZM-144 should be targeted for future improvement of the trait. [ABSTRACT FROM AUTHOR]