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Comparisons of Lysine and Zein and Nonzein Protein Contents in Immature and Mature Maize Endosperm Mutants¹

Maize (Zea mays L.) endosperm mutant shrunken-4 (sh₄) was compared with nine other starch mutants and three "high-lysine" mutants for lysine and zein and nonzein protein content at 22 days after pollination and at maturity. The sh₄ mutant was unique in showing no zein at 22 days and only 10% of the normal value at maturity. Nonzein protein and lysine/kernel were extremely low at maturity in sh₄, showing almost no increase after 22 years. The effects of sh₄ on protein content appear to be an exaggerated form of those produced by the highlysine mutant opaque-7.

Key Words: Zea mays L. • Amino acids • Seed development

² Associate professors, Dep. of Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907.

Received for publication July 3, 1974.