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Plant Physiology 65:860-863 (1980)
© 1980 American Society of Plant Biologists

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Articles

Calcium Inhibition of Pyrophosphatase in Crude Plant Extracts

IMPLICATION OF SOLUBLE CALCIUM IN C4 PHOTOSYNTHESIS

Nikos A. Gavalas and Yiannis Manetas

Laboratory of Plant Physiology, University of Patras, Patras, Greece

Assays of alkaline pyrophosphatase activity in crude plant extracts are inhibited by soluble calcium coextracted with the enzyme from leaf tissues. Calcium concentrations in most extracts are high enough to interfere seriously with the assay.

All C4 plants examined kept their soluble calcium and interference with pyrophosphatase activity at very low levels, whereas the C3 plants covered the whole range of soluble calcium concentration. The hypothesis is advanced that low soluble calcium might be a prerequisite for high activity of pyrophosphatase and the C4 pathway.






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Copyright © 1980 by the American Society of Plant Biologists