Plant Physiol. Illumina
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Plant Physiology 58:28-32 (1976)
© 1976 American Society of Plant Biologists

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Articles

Carbohydrate and Enzymic Characterization of a High Sucrose Sugary Inbred Line of Sweet Corn 1

Jorge W. Gonzales2, Ashby M. Rhodes and David B. Dickinson

a Department of Horticulture, University of Illinois, Urbana, Illinois 61801

Reserve carbohydrates were determined on developing endosperm of a new line of sugary maize (Zea mays L.). Other entries, included for comparative purposes, were Midway (sugary), Funks G4646 (starchy), and Illini X-tra Sweet (shrunken-2). Sucrose in the new line, Illinois 677a, was more than twice that of Midway at most stages of development, and reached a maximum of 40% of dry weight at 18 days after pollination. Appreciable phytoglycogen accumulated in Illinois 677a, reaching 30% or more of dry weight as endosperm tissue matured. Thus, Illinois 677a is a typical sugary maize concerning phytoglycogen content, but it resembles shrunken-2 concerning the extent of sucrose accumulation.

Enhanced sucrose accumulation by Illinois 677a was not accounted for by altered in vitro activities of invertase, sucrose synthase, UDP-glucose pyrophosphorylase, or ADP-glucose pyrophosphorylase. Its normal level of ADP-glucose pyrophosphorylase set Illinois 677a apart from shrunken-2 in which the enzyme was drastically reduced.

2 Present address: Research Division, Standard Fruit Company, La Ceiba, Honduras.

1 This work was supported by the Illinois Agriculture Experiment Station and National Science Foundation Grant PCM-74-19113. J. W. G. held a Wright predoctoral fellowship awarded by the University of Illinois College of Agriculture.






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Copyright © 1976 by the American Society of Plant Biologists