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The light-dependent development of the photosynthetic apparatus in the first leaf of the C(4) plant pearl millet (Pennisetum americanum) was monitored by immunologically determining the concentration of phospho-enolpyruvate carboxylase and ribulose 1,5-bisphosphate carboxylase. A competitive enzyme-linked immunosorbent assay procedure using antibodies to the monomeric subunit of phosphoenolpyruvate carboxylase and the large and small subunit of ribulose 1,5-bisphosphate carboxylase was used to quantitate the amounts of these polypeptides in the first leaf of etiolated seedlings and etiolated seedlings exposed to light for varying periods of time. Phosphoenolpyruvate carboxylase was present in etiolated tissue; however, light stimulated its synthesis nearly 23-fold. Maximum accumulation of phosphoenolpyruvate carboxylase occurred approximately 4 days after etiolated plants were placed in the light. Both the large subunit and the small subunit of ribulose 1,5-bisphosphate carboxylase were present in leaves of etiolated seedlings. Light also stimulated the synthesis of both of these polypeptides, but at different rates. In etiolated leaves there was approximately a 3-fold molar excess of the small subunit to large subunit. Exposure of the etiolated leaves to light resulted in the molar ratio of the large subunit to the small subunit increasing to approximately 0.72. These data indicate that the net synthesis of these two polypeptides is not coordinately regulated at all times.

plant physiology

Immunological Determination of Phosphoenolpyruvate Carboxylase and the Large and Small Subunits of Ribulose 1,5-Bisphosphate Carboxylase in Leaves of the C<sub>4</sub> Plant Pearl Millet

Immunological Determination of Phosphoenolpyruvate Carboxylase and the Large and Small Subunits of Ribulose 1,5-Bisphosphate Carboxylase in Leaves of the C4 Plant Pearl Millet

Immunological Determination of Phosphoenolpyruvate Carboxylase and the Large and Small Subunits of Ribulose 1,5-Bisphosphate Carboxylase in Leaves of the C₄ Plant Pearl Millet