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Starch: Variation Associated with Location in Corn and Sorghum Plants¹

Starch granules from stems of mature corn (Zea mays L.) and sorghum (Sorghum bicolor L. Moench) plants were about a third as large as average granules from endosperm tissue of the same species and contained only 1/3 to 1/2 as much amylose. The stem starches had lower gelatinization temperatures and gave C X-ray diagrams instead of the A diagram typical of normal cereal endosperm starches.

Key Words: Amylose • Intrinsic viscosity • Male-sterility • Microsopy • Starch gelatinization • Sorgo • Sugar • X-ray

² Section Leader, Agronomics and Milling: Research Biochemist; and Section Leader, Polymer Properties.

Received for publication July 16, 1971.