Plant Physiol.
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Plant Physiology 92:427-433 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Changes in the Composition and Synthesis of Proteins in Cellular Membranes of Echinochloa crus-galli (L.) Beauv. Seeds during the Transition from Dormancy to Germination

Liliana Di Nola1, Charles F. Mischke and Ray B. Taylorson

U.S. Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Plant Sciences Institute, Beltsville, Maryland 20705, Weed Science Laboratory, Beltsville, Maryland 20705

The effect of alcohols which stimulate or have no effect on germination on the composition and synthetic pattern of proteins in the cellular membranes of Echinochloa crus-galli (L.) Beauv. seeds was studied. Imbibition of dry seeds was accompanied by an increase in the synthesis of proteins and by synthesis of new proteins in their intracellular membranes. The transition of the seeds from a dormant to a nondormant state was associated with synthesis of specific proteins and a decrease in content of others in the plasma membrane. The synthesis of a 23 kilodalton protein was strongly increased upon release from dormancy. The changes in the pattern of protein synthesis were not directly associated with the beginning of germination. The results suggest that the plasma membrane constitutes the first site in the seed cells, at which the stimulus from external factors affecting seed dormancy is detected.

1 Present address: Center for Biologics Evaluation and Research, Food and Drug Administration, Bldg. 29, Rm. 523, 8800 Rockville Pike. Bethesda, MD 20892.






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