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Published in Crop Sci 10:332-335 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Variation in Carbohydrate Composition in the Endosperm of Sweet Corn (Zea mays L.) in Relation to Maturity1

R. W. Rosenbrook and R. H. Andrew2

Reducing sugars, sucrose, and water-soluble polysaccharides were quantitatively determined for kernels of eight inbred lines of sweet corn and their Fl combinations, including reciprocals, 25 days after pollination. A second harvest was taken from the inbred parents at 28 days. The inbreds differed significantly for percent moisture and for each carbohydrate fraction. Moisture content and carbohydrate composition changed at significantly different rates for the eight lines.

Analysis of covariance was used to remove effects of maturity on F1 kernels. There were highly significant differences among maternal half-sib groups for percent moisture, reducing sugars, sucrose, and water-soluble polysaccharides. Differences within half-sib groups were significant for all variables except reducing sugars. Differences among reciprocal crosses were attributed to maternal effects and gene-dosage relationships in the endosperm. Regression coefficients showed that content of reducing sugars and sucrose decreased, but content of water-soluble polysaccharides rapidly increased with advancing maturity.

Key Words: Gene-dosage • Maternal effects

1 Contribution from the Department of Agronomy, Wisconsin Agr. Exp. Sta., Madison, Wis. 53706. Published with approval of the Director of the Research Division, College of Agricultural and Life Sciences. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Supported in part by the Research Committee of the Graduate School with funds supplied by the Wisconsin Alumni Research Foundation. Use of equipment of the Wisconsin Numerical Analysis Laboratory was supported by the National Science Foundation and by the Wisconsin Alumni Research Foundation through a grant by the Research Committee of the Graduate School.

2 Formerly Fellow in Agronomy (now Research Station Manager, Pioneer Hi-Bred Corn Company, Mankato, Minn. 56002) and Professor of Agronomy, Wis. Agr. Exp. Sta., Madison, 53706. The authors gratefully acknowledge advice of Dr. J. H. Torrie in the statistical analyses and of Dr. Dale Smith in the laboratory analyses.

Received for publication September 17, 1969.




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