scholarly journals Response of Respiration of Tobacco Leaves in Light and Darkness and the CO2 Compensation Concentration to Prior Illumination and Oxygen

1971 ◽  
Vol 48 (2) ◽  
pp. 178-182 ◽  
Author(s):  
G. H. Heichel
Keyword(s):  
Tobacco Leaves ◽  
Co2 Compensation Concentration ◽  
Compensation Concentration

Glycolate metabolism in young and old tobacco leaves, and effects of α-hydroxy-2-pyridinemethanesulfonic acid

1973 ◽  
Vol 51 (10) ◽  
pp. 1857-1865 ◽  
Author(s):  
Marvin L. Salin ◽  
Peter H. Homann
Keyword(s):  
Gas Exchange ◽  
Leaf Tissue ◽  
Glycolate Oxidase ◽  
Low Permeability ◽  
Mesophyll Cells ◽  
Tobacco Leaves ◽  
Young Leaves ◽  
Glycolate Metabolism ◽  
Lower Ability ◽  
Compensation Concentration

Young tobacco leaves photorespire less than older leaves. This difference is reflected by lower activities of photorespiratory enzymes in young leaves, and by an apparent inability to synthesize glycolate, the substrate of photorespiration.It is shown in this paper that young tobacco leaves differ from old ones in the following, additional respects: (1) extracts have a much lower ability to decarboxylate glycine; (2) the transient burst of CO2 after lowering of the light intensity is nearly absent; (3) photosynthesis is much less inhibited when leaves are floated on solutions of the inhibitor of glycolate oxidase α-hydroxy-2-pyridinemethanesulfonic acid (HPMS); (4) the CO2 compensation concentration is higher; and (5) the mesophyll cells are much more densely packed.It is concluded that the small photorespiratory gas exchange of young leaves is due to deficiencies in enzymes of glycolate metabolism and perhaps to a slow synthesis of glycolate. The latter may be explained by a relatively high internal CO2 concentration resulting from large physical resistances to gas exchange in the tissue. However, the rate of glycolate formation possibly is underestimated because of a low permeability of young leaf tissue to HPMS.Other results provide evidence that HPMS alters the biochemical pattern of CO2 photoassimilation in old tobacco leaves under certain conditions. Hence, this poison ought to be used with caution in studies on photorespiration and glycolate metabolism.

Incorporation of 14CO2 into C4 acids by leaves of C3-C4 intermediate and C3 species of Moricandia and Panicum at the CO2 compensation concentration

Planta ◽  
1988 ◽  
Vol 173 (3) ◽  
pp. 411-418 ◽  
Author(s):  
Chris J. Chastain ◽  
Raymond Chollet
Keyword(s):  
Co2 Compensation Concentration ◽  
C3 Species ◽  
Compensation Concentration

CO2 compensation concentration in bean Leaves: Effect of photon flux density and leaf age

1979 ◽  
Vol 21 (5) ◽  
pp. 361-364 ◽  
Author(s):  
J. Čatský ◽  
Ingrid Tichá
Keyword(s):  
Flux Density ◽  
Leaf Age ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Co2 Compensation Concentration ◽  
Compensation Concentration ◽  
Bean Leaves

C3?C4 Intermediate species in the genus Flaveria: leaf anatomy, ultrastructure, and the effect of O2 on the CO2 compensation concentration

Planta ◽  
1984 ◽  
Vol 160 (1) ◽  
pp. 25-32 ◽  
Author(s):  
A. Scott Holaday ◽  
Kit W. Lee ◽  
Raymond Chollet
Keyword(s):  
Leaf Anatomy ◽  
Intermediate Species ◽  
Co2 Compensation Concentration ◽  
Compensation Concentration

scholarly journals Relation of CO2 Compensation Concentration to Apparent Photosynthesis in Maize

1969 ◽  
Vol 44 (12) ◽  
pp. 1724-1728 ◽  
Author(s):  
Gary H. Heichel ◽  
Robert B. Musgrave
Keyword(s):  
Co2 Compensation Concentration ◽  
Compensation Concentration
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