Abstract
Summary Marked differences in the accumulation of protein fractions, lysine and tryptophan have been observed in normal (Vijay and Ganga-5) and opaque-2 (Shakti and Rattan) maize during endosperm development. The rate of protein synthesis was higher in normal maize. Higher levels of lysine and tryptophan in opaque-2 are due to depressed zein and increased albumin + globulin levels compared to normal maize. Protein quality deteriorates in both normal and opaque-2 during later stages of endosperm development. The zein level attained in Vijay normal at 20 days post-pollination was not reached until the end of maturity in Rattan opaque-2. It has been suggested that absolute amount of each protein fraction per endosperm rather than per cent distribution should be studied to understand the pattern of protein synthesis for genetic upgradation of grain protein quality.
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