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Starch and Sucrose Synthesis in Phaseolus vulgaris as Affected by Light, CO(2), and Abscisic Acid.
MedLine Citation:
PMID:  16664108     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Phaseolus vulgaris L. leaves were subjected to various light, CO(2), and O(2) levels and abscisic acid, then given a 10 minute pulse of (14)CO(2) followed by a 5 minute chase with unlabeled CO(2). After the chase period, very little label remained in the ionic fractions (presumed to be mostly carbon reduction and carbon oxidation cycle intermediates and amino acids) except at low CO(2) partial pressure. Most label was found in the neutral, alcohol soluble fraction (presumed sucrose) or in the insoluble fraction digestable by amyloglucosidase. Sucrose formation was linearly related to assimilation rate (slope = 0.35). Starch formation increased linearly with assimilation rate (slope = 0.56) but did not occur if the assimilation rate was below 4 micromoles per square meter per second. Neither abscisic acid, nor high CO(2) in combination with low O(2) (thought to disrupt control of carbon metabolism) caused significant perturbations of the sucrose/starch formation ratio. These studies indicate that the pathways for starch and sucrose synthesis both are controlled by the rate of net CO(2) assimilation, with sucrose the preferred product at very low assimilation rates.
Authors:
T D Sharkey; J A Berry; K Raschke
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  77     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1985 Mar 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  617-20     Citation Subset:  -    
Affiliation:
Biological Sciences Center, Desert Research Institute, P. O. Box 60220, Reno, Nevada 89506.
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