Document Detail

Oxaloacetate as the Source of Carbon Dioxide for Photosynthesis in Bundle Sheath Cells of the C(4) Species Panicum maximum.
MedLine Citation:
PMID:  16660057     Owner:  NLM     Status:  PubMed-not-MEDLINE    
3-Mercaptopicolinic acid (3-MPA), an inhibitor of phosphoenolpyruvate carboxykinase, was employed to study the role of organic acid decarboxylation during C(4) photosynthesis. Treatment of detached Panicum maximum leaves with 5 mm 3-MPA inhibited photosynthesis 70 to 75%. Oxygen was found to have no effect on the degree of inhibition. The postillumination (14)CO(2) burst associated with P. maximum photosynthesis was almost abolished by 5 mm 3-MPA. The turnover rates of malate and aspartate during C(4) photosynthesis were severely reduced as well as the rates of formation of C(3) cycle intermediates in P. maximum leaves treated with 3-MPA. These results are interpreted as direct evidence for the fixation of CO(2), arising from the decarboxylation of oxaloacetate, by the C(3) cycle in bundle sheath cells of P. maximum leaves.
T B Ray; C C Black
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  60     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1977 Aug 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  193-6     Citation Subset:  -    
Department of Botany, University of Georgia, Athens, Georgia 30602.
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