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PLANT PHYSIOLOGY , Vol 108, Issue 2 735-741, Copyright © 1995 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Effect of Anoxia on Carbohydrate Metabolism in Rice Seedlings

L. Guglielminetti, P. Perata and A. Alpi
Dipartimento di Biologia delle Piante Agrarie, Sezione di Fisiologia Vegetale, University of Pisa, Via Mariscoglio 34, I-56124 Pisa, Italy

The metabolism of carbohydrates was investigated in rice (Oryza sativa L.) seedlings grown under anoxia. Two phases can be recognized in the utilization of carbohydrates: during the first days of germination under anoxia, the metabolism of sugars is mainly degradative, whereas after the induction of [alpha]-amylase (EC 3.2.1.1) has taken place, the increased presence of glucose and sucrose indicates that both starch degradation and sucrose synthesis operate. The analysis of the enzymes involved in carbohydrate metabolism indicates that anoxic rice seedlings possess a set of enzymes that allow the efficient metabolism of starch and sucrose to fructose-6-phosphate. We propose that cytosolic sucrose metabolism in anoxic rice seedlings takes place mainly through a sucrose synthase (EC 2.4.1.13) pathway with nucleoside diphosphate kinase (EC 2.7.4.6), allowing the cycling of urydilates needed for the operation of this pathway.


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