Document Detail

Restoration of Organic Acid Accumulation in Sectioned Leaves of Bryophyllum tubiflorum Harv.
MedLine Citation:
PMID:  16659404     Owner:  NLM     Status:  PubMed-not-MEDLINE    
When leaves of Bryophyllum tubiflorum were cut into transverse sections, and held at 20 C in the dark, the capacity to accumulate organic acid decreased with decreasing section thickness. In addition, the rate of respiration increased with decreasing section thickness and was unaffected by changes in O(2) concentration above 5% or by the presence (1%) of CO(2). It was concluded that O(2) ventilation is not a controlling factor in respiration. Malonate (0.1 m) and fluoroacetate (0.01 m) restored the capacity of sectioned leaves to accumulate acid to normal levels and depressed respiration in 1-millimeter sections. Acid accumulation in 8-millimeter sections remained essentially constant at 20, 15, and 10 C, and was equal to that in unsectioned leaves, but accumulation in 2-millimeter sections rose to normal levels as the temperature fell to 10 C. Twenty-three additional metabolic inhibitors (none specific to the tricarboxylic acid cycle) were screened, and none promoted acid accumulation in sectioned leaves at 20 C. The results suggest that sectioning stimulates a respiratory sequence which includes the tricarboxylic acid cycle. This sequence in turn competes with the synthesis or accumulation of malic acid.
T B Kinraide; M J Behan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  56     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1975 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:  830-5     Citation Subset:  -    
Department of Biology, The Colorado College, Colorado Springs, Colorado 80903.
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