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Inheritance of Hilar Layer Coloring in White Corn (Zea mays L.)¹

The inheritance of hilar layer coloring (also known as black layer) in maize (Zea mays L.) was studied using 4 white endosperm inbred line parents, their 6 possible F₁ and F₂ generation single crosses, and 12 first generation backcrosses and their reciprocals. The results showed that the inheritance of hilar layer coloring is complex in this set of material, but it should be possible to develop corn strains with less hilar layer coloring. However, because hilar coloring may be due to condensed phenolic compounds that may inhibit the passage of certain pathogenic fungi into the kernel, reducing the level of pigmentation might lower resistance to kernel-rotting fungi. Further studies are needed to determine if hilar layer pigmentation inhibits kernel-rotting fungi.

Key Words: Black layer • Corn milled products • Kernel rot

² Research Agronomist, ARS, USDA, and Professor of Agronomy, University of Columbia, MO 65201; Research Chemist, ARS, USDA, Peoria, IL 61604; Experiment Station Statistician, University of Missouri, Columbia, MO 65201; and Technical Assistant, ARS, USDA, Peoria, IL 61604.

Received for publication April 26, 1973.