Maysin Content of Silks of Nine Maize Genotypes Grown in Diverse Environments1

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Abstract
Maysin is a flavone glycoside that exhibits antibiotic activity toward corn earworm [Heliothis zea (Boddie)] and can be present the silks of maize (Zea mays L.). Nine maize genotypes were grown at four locations in 1979 and five locations in 1980 and evaluated for relative content of maysin in their silks. Differences among maize genotypes for maysin content were highly, significant. ‘Golden Cross Bantam’ (corn earworm susceptible) and experimental hybrid 471‐U6 ✕ 81‐1 (corn earworm tolerant) consistently had the lowest relative maysin content whereas P39 ✕ ZC 2451, a susceptible sweet corn ✕ resistant dent corn cross, consistently had the highest relative maysin content although a significant genotype by environment interaction was present. When genotype maysin means among environments were correlated, the genotypes grown in Missouri demonstrated the least agreement with genotype maysin means from other environments. The relative maysin content of silks was highest in Georgia and lowest in Hawaii, and a significantly lower level occurred in 1980 than in 1979. At this time, no biological explanation can be offered for environmental differences in average maysin content.

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