Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 45:163-168 (1970)
© 1970 American Society of Plant Biologists

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Articles

Starch Synthesis Studies in Zea mays

II. Molecular Distribution of Radioactivity in Starch 1,2

Jack C. Shannona

R. G. Creechb and J. D. Loerchb

a Crops Research Division, Agricultural Research Service, United States Department of Agriculture; and Department of Agronomy, Purdue University, Lafayette, Indiana 47907, Departments of Horticulture and Biochemistry, Pennsylvania State University, University Park, Pennsylvania 16802

The amylose and amylopectin fractions from kernel starch synthesized shortly after exposure of intact Zea mays L. plants to 14CO2 had similar specific radioactivities (counts per min per mg of carbohydrate). In both fractions the radioactivity was distributed throughout the molecules. These data are consistent with a model in which the polysaccharides are synthesized in the matrix of the amyloplast followed by crystallization of the completed molecules onto the starch granule.

1 Cooperative investigations of the Crops Research Division, Agricultural Research Service, United States Department of Agriculture; the Purdue Agricultural Experimental Station, Lafayette, Indiana; and the Pennsylvania Agricultural Experiment Station, University Park, Pennsylvania. This work was begun when J. C. Shannon was a visiting Professor in Horticulture at The Pennsylvania State University. This is Purdue Agricultural Experiment Station Journal Paper No. 3727.

2 The paper given in Reference 18 is considered no. I in this series.




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M. Peng, M. Gao, M. Båga, P. Hucl, and R. N. Chibbar
Starch-Branching Enzymes Preferentially Associated with A-Type Starch Granules in Wheat Endosperm
Plant Physiology, September 1, 2000; 124(1): 265 - 272.
[Abstract] [Full Text]


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