The synthesis of phosphoenolpyruvate carboxylase in imbibing sorghum seeds

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Abstract
When sorghum seeds were imbibed either in the light or in the dark, the presence of newly synthesized phosphoenolpyruvate carboxylase (PEPC) could be detected immunologically after approximately 6 h. In addition, both PEPC mRNA and enzyme activity were detected in extracts of dry seeds prior to imbibition. By contrast, ribulose-1,5-bisphosphate carboxylase mRNA, protein, and activity, as well as chlorophyll, were not detected even after 24 h of imbibition. These observations suggest that the nonphotosynthetic form of PEPC is synthesized during seed development and may play an important role in the germinative process.Key words: phosphoenolpyruvate carboxylase, sorghum seeds, germination, ribulose-1,5-bisphosphate carboxylase.

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