Abstract
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.
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