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Alteration of Carbohydrate Composition of Corn (Zea mays L.) Seedlings during Moisture Stress¹

Carbohydrate composition and constituents associated with carbohydrates were determined in corn (Zea mays L.) seedlings subjected to three levels of moisture stress. Stress had no effect on fructose and glucose concentrations, increased sucrose concentration slightly, and decreased starch concentration markedly. Chlorophyll concentration decreased with increasing moisture stress, and chlorophyll a was affected more than chlorophyll b. Sucrose and starch synthesis, measured by ¹⁴C-glucose incorporation, were not changed by stress. Enzymatic hydrolysis of sucrose decreased and hydrolysis of starch increased during stress. The latter changes were apparently survival ada.ptations to stress conditions. Maintaining or increasing concentrations of low molecular weight carbohydrates probably helped plants retain turgidity and protected protoplasmic constituents.

Key Words: Drought • Sugars • Chlorophyll • Enzymes

² Graduate Research Assistant (now Assistant Professor of Agronomy, University of Nebraska, Lincoln 68503) and Associate Professor of Agronomy, Kansas State University, Manhattan 66502.

Received for publication November 6, 1969.