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Effect of Outcrossing on Protein Quality, Kernel Weight, and Related Characters in Opaque-2 and Floury-2 Maize (Zea mays L.)¹

Outcrossing of opaque-2 and floury-2 single crosses of corn, Zea mays L., to the same mutant but unrelated genotype, significantly increased kernel weight and weight of grain per ear of opaque-2 and floury-2 single crosses, and this increase was greater than in the normal counterparts. When sibbed, opaque-2 and floury-2 kernels had heavier germs than the normal kernels. Outcrossing also increased weight of endosperm in opaque-2, floury-2, and normal kernels; and germ weight in opaque-2 and normal kernels. Protein and lysine content were apparently not affected by outcrossing.

Key Words: Opaque-2 • Floury-2 • Germ • Endosperm

² Graduate student (present address: Andra Pradesh Agricultural University, Rajendranagar, Hyderabad-30, India), Professor of Agronomy, and graduate student (now in military service).

Received for publication August 4, 1969.