Document Detail

Estimation of Photorespiration Based on the Initial Rate of Postillumination CO(2) Release: I. A Nonsteady State Model for Measurement of CO(2) Exchange Transients.
MedLine Citation:
PMID:  16663355     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Although open systems have been used for the study of transients in leaf CO(2) exchange such as the postillumination burst, these systems frequently do not permit reliable estimates of transient rates due to their nonsteady state nature. A nonsteady state mathematical approach is described which predicts changes in CO(2) concentration in the leaf chamber and infrared gas analyzer measuring cell as a function of leaf CO(2) exchange rate in Nicotiana tabacum vars John Williams Broadleaf and Havana Seed. With the aid of a computer, a numerical formula simulates the mixing and dilution which occurs as CO(2) passes through the finite volume of the measuring cell of the analyzer. The method is presented with special relevance to photorespiration as manifested by the postillumination burst of CO(2). The latter is suggested to decline with the first order kinetics following darkening of a C(3) leaf. This approach provides a basis for reliable estimation of the initial and, hence, maximal rate of CO(2) evolution during the postillumination burst under a variety of environmental conditions.
R B Peterson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  73     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1983 Dec 
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:  978-82     Citation Subset:  -    
Department of Biochemistry and Genetics, The Connecticut Agricultural Experiment Station, P. O. Box 1106, New Haven, Connecticut 06504.
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