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Plant Physiology 59:1133-1135 (1977)
© 1977 American Society of Plant Biologists

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Articles

Photosynthesis In Elodea canadensis Michx

Four-Carbon Acid Synthesis 1

Dave Degroote and Robert A. Kennedy

a Department of Botany, University of Iowa, Iowa City, Iowa 52242

Experiments to determine the early labeled photosynthetic products in Elodea canadensis show that after 2 seconds of exposure to NaH14CO3, 45% of the 14C incorporated is located in malate and aspartate. Phosphoglyceric acid and sugars account for 27% of the label during similar exposures. Equivalent amounts of organic acids and C3 cycle products are present after 8 seconds. Four-carbon acids remain relatively unchanged throughout the first 45 seconds of exposure, while sugars increase in a linear fashion. Enzyme assays indicate that ribulose diphosphate and phosphoenolpyruvate carboxylase enzymes are present in a ratio of approximately 2:1. It appears that E. canadensis is able to synthesize significant amounts of four-carbon acids via {beta}-carboxylation and this may play a role in maintaining a pH favorable for carboxylation in aquatic plants.

1 This study supported by National Science Foundation Grant BMS-75-09931.




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Copyright © 1977 by the American Society of Plant Biologists