Characterization of Photorespiration in Intact Leaves Using 13Carbon Dioxide Labeling
AUTOR(ES)
Schaefer, Jacob
RESUMO
The 13C nuclear magnetic resonance spectra of sucrose extracted from intact soybean and corn leaves labeled with 13CO2 for 5 to 180 minutes have been obtained at 22.6 megahertz. The spectra provide a direct determination of the relative concentrations of 12C-13C and 13C-13C pairs of carbons in the labeled triose components of sucrose. This distribution of label is strongly dependent on the O2 concentrations used during labeling for soybean but not for corn. Based on the time dependence of the experimental labeling patterns, photorespiration in air appears to be a sizable fraction of the apparent photosynthetic rate for soybean, but not for corn.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=440307Documentos Relacionados
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