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Changes in endosperm type used for commercial sweet corn  (Zea mays  L.) production may affect corn protein levels. The two most widely used endosperm types are  sugary-1 (su1)  and  shrunken-2 (sh2).  To determine the effects of endosperm type on protein concentration, we calculated kernel N concentrations of dry mature kernels of seven inbreds near-isogenic for  su1  and  sh2  and of four samples of commercially canned  su1  and  sh2  sweet corn. Nitrogen values were converted to protein values using a standard conversion factor for maize. For the dry kernels and the canned samples, significant differences were detected between endosperm types for kernel protein concentration when measured on a weight basis. Averaged overall inbreds, the  sh2  dry kernels had 30% more protein than  su1  kernels. On a weight basis, the  sh2  canned samples averaged 22% more protein than the  su1  samples. When compared on a kernel basis, protein concentration of the two endosperm types did not differ. Thus,  sh2  sweet corn marketed as a frozen or canned product may be identified as a higher protein product when the serving size is based on weight or calories.

Kernel Protein Concentration in sugary-1 and shrunken-2 Sweet Corn