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Published in Crop Sci 18:743-746 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Gene Effects on Kernel Moisture and Sugars of Near-Isogenic Lines of Sweet Corn1

R. M. Soberalske and R. H. Andrew2

Numerous genes affect carbohydrate composition of the endosperm of corn (Zea mays L.). The objective of this study was to measure the effect of 10 gene combinations on level, rate of change, and interrelationships of kernel moisture and sugars during the first 4 weeks after pollination as influenced by the modifier complexes of seven adapted sweet corn inbreds. Four genes influencing endosperm carbohydrates, dull (du), sugary-2 (su2), waxy (wx), and shrunken-2 (sh2), and one double combination (du wx), each in association with the sugary-1 alleles (Su1 and su1), were incorporated into adapted sweet corn inbreds to give seven near-isogenic series. Determinations were made of moisture, reducing sugars, sucrose, and total sugars at four successive harvests. The sh2, gene, and to a lesser extent the du wx combination, show promise for improved kernel moisture and total sugars and for reduced rates of loss of these components as compared to sweet corn presently in use (su1 for processing. In view of the marked differences in the expression of these genes in the inbreds studied here it is desirable to incorporate them into a broad range of germplasm in a search for modifiers that will further improve and utilize their potential in hybrid combinations.

Key Words: Modifying genes • Quality

1 Contribution from the Dep. of Agronomy, Wisconsin Agric. Exp. Stn., Madison. Research supported by the College of Agric. and Life Sci., Univ. of Wisconsin-Madison, and the Wisconsin Alumni Research Foundation. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph. D. degree.

2 Specialist and professor, respectively, Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706.

Received for publication February 13, 1978.




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