Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 56:579-583 (1975)
© 1975 American Society of Plant Biologists

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Articles

Enzymes of Carbohydrate Metabolism in the Developing Rice Grain

Consuelo M. Perez, Alicia A. Perdon, Adoracion P. Resurreccion, Ruth M. Villareal and Bienvenido O. Juliano

Department of Chemistry, International Rice Research Institute, Los Baños, Laguna, Philippines

The levels of reducing and nonreducing sugars, starch, soluble protein, and selected enzymes involved in the metabolism of sucrose, glucose-1-P, and glucose nucleotides were assayed in dehulled developing rice grains (Oryza sativa L. line IR1541-76-3) during the first 3 weeks after flowering. The level of reducing sugars in the grain was highest 5 to 6 days after flowering. The level of nonreducing sugars and the rate of starch accumulation were maximum 11 to 12 days after flowering, when the level of soluble protein was also the highest. The activities of bound and free invertase, sucrose-UDP and sucrose-ADP glucosyltransferases, hexokinase, phosphoglucomutase, nucleoside diphosphokinase, and UDP-glucose and ADP-glucose pyrophosphorylases were high throughout starch deposition, and were maximum, except for nucleoside diphosphokinase which did not increase in activity, between 8 and 18 days after flowering. Soluble primed phosphorylase and ADP glucose-{alpha}-glucosyltransferase (starch synthetase) were both present during starch accumulation. Phosphorylase activity was at least 2-fold that of soluble starch synthetase but the synthetase followed more closely the rate of starch accumulation in the grain. The activity of starch synthetase bound to the starch granule also increased progressively with increased starch content of the grain.




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D. N.P. Doan, H. Rudi, and O.-A. Olsen
The Allosterically Unregulated Isoform of ADP-Glucose Pyrophosphorylase from Barley Endosperm Is the Most Likely Source of ADP-Glucose Incorporated into Endosperm Starch
Plant Physiology, November 1, 1999; 121(3): 965 - 975.
[Abstract] [Full Text]


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Copyright © 1975 by the American Society of Plant Biologists