scholarly journals A Synergistic Stimulation of Avena sativa Coleoptile Elongation by Indoleacetic Acid and Carbon Dioxide

1974 ◽  
Vol 54 (1) ◽  
pp. 15-18 ◽  
Author(s):  
A. W. Bown ◽  
I. J. Dymock ◽  
T. Aung
Keyword(s):  
Carbon Dioxide ◽  
Avena Sativa ◽  
Indoleacetic Acid ◽  
Coleoptile Elongation ◽  
Stimulation Of

An investigation into the influence of IAA and malate on in vivo and in vitro rates of dark carbon dioxide fixation in coleoptile tissue

1977 ◽  
Vol 55 (12) ◽  
pp. 1641-1645 ◽  
Author(s):  
I. J. Dymock ◽  
B. Hill ◽  
A. W. Bown
Keyword(s):  
Carbon Dioxide ◽  
Avena Sativa ◽  
Indoleacetic Acid ◽  
Enzymic Activity ◽  
Time Period ◽  
Rapid Effect ◽  
Bicarbonate Fixation ◽  
Stimulation Of

Etiolated Avena sativa L. cv. Victory coleoptiles were used to determine the influence of indoleacetic acid (IAA) or malate on in vivo and in vitro rates of CO2 fixation. In addition, the influence of malate on IAA-stimulated growth was investigated. Concentrations of malate which stimulate growth did not influence the in vivo rate of dark [14C]bicarbonate fixation but did inhibit in vitro phosphoenolpyruvate carboxylase (EC 4.1.1.31) activity. IAA did not influence this enzymic activity or reduce the inhibition of the enzyme by malate, and the rate of [14C]bicarbonate fixation was not measurably influenced by 20 μM IAA within the time period required for IAA stimulation of growth to become apparent. In the absence of atmospheric levels of CO2, 1 mM malate and 20 μM IAA stimulate growth in a weakly synergistic manner. These results are discussed in relationship to a suggestion that IAA-stimulated H+ secretion and growth involves a rapid effect on CO2 fixation.

Inhibition by carbon dioxide of the phototropic response of the Avena coleoptile to blue light

1987 ◽  
Vol 65 (3) ◽  
pp. 488-490 ◽  
Author(s):  
Gordon I. McIntyre
Keyword(s):  
Carbon Dioxide ◽  
Blue Light ◽  
Avena Sativa ◽  
Water Saturation ◽  
Phototropic Response ◽  
Avena Coleoptile ◽  
Inhibition Of Growth ◽  
Saturated Water ◽  
Coleoptile Elongation

When intact oat coleoptiles (Avena sativa var. Harmon) were submerged in water, saturation of the water with CO2 promoted their elongation but eliminated their phototropic response to blue light. Increasing the pH of the CO2-saturated water prevented the promotion of coleoptile elongation but did not prevent the elimination of the phototropic response. In air, phototropic curvature was significantly reduced by 10% CO2 and was eliminated by 30%, without any reduction in growth. It is postulated that the increase in CO2 concentration may eliminate the phototropic curvature of the coleoptile by preventing the light-induced inhibition of growth on the illuminated side of the organ. Possible mechanisms are briefly discussed.

scholarly journals THE MORPHOLOGICAL CHANGES IN THE TISSUES OF THE RABBIT AS A RESULT OF REDUCED OXIDATION

1918 ◽  
Vol 27 (3) ◽  
pp. 399-412 ◽  
Author(s):  
H. G. Martin ◽  
A. S. Loevenhart ◽  
C. H. Bunting
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Content ◽  
Morphological Changes ◽  
Low Oxygen ◽  
High Carbon ◽  
Red Bone Marrow ◽  
Hydropic Degeneration ◽  
Thyroid Hyperplasia ◽  
High Carbon Dioxide ◽  
Stimulation Of

Exposure of rabbits to an atmosphere of low oxygen content results in a stimulation of the cardiorespiratory systems, in an extension (hyperplasia) of red bone marrow and probably of a thyroid hyperplasia, with the further production of hydropic and hyaline degeneration in the cells of the parenchymatous organs. An atmosphere of high carbon dioxide and normal oxygen content produces, however, a stimulation of the cardiorespiratory systems, but no marrow extension and, in the concentrations used, but slight hydropic degeneration in the parenchyma of the glandular organs.

scholarly journals Stimulation of Border Cell Production in Response to Increased Carbon Dioxide Levels

2000 ◽  
Vol 122 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Xiaowen Zhao ◽  
Iraj J. Misaghi ◽  
Martha C. Hawes
Keyword(s):  
Carbon Dioxide ◽  
Cell Production ◽  
Border Cell ◽  
Carbon Dioxide Levels ◽  
Stimulation Of

Microbial electrochemical stimulation of caproate production from ethanol and carbon dioxide

2020 ◽  
Vol 295 ◽  
pp. 122266 ◽  
Author(s):  
Yong Jiang ◽  
Na Chu ◽  
Ding-Kang Qian ◽  
Raymond Jianxiong Zeng
Keyword(s):  
Carbon Dioxide ◽  
Stimulation Of

The presence and role of phosphopyruvate carboxylase in etiolated coleoptiles of Avena sativa

1971 ◽  
Vol 49 (2) ◽  
pp. 321-326 ◽  
Author(s):  
A. W. Bown ◽  
W. W. Lampman
Keyword(s):  
Carbon Dioxide ◽  
Protein Synthesis ◽  
Avena Sativa ◽  
Malic Enzyme ◽  
Carbon Dioxide Fixation

Phosphopyruvate carboxylase and malic enzyme were detected in etiolated coleoptiles of Avena sativa, and it was concluded that the incorporation of 14C-labeled bicarbonate into aspartate and glutamate involved the activity of the former enzyme. IAA stimulated the fixation of labeled bicarbonate, and the incorporation of labeled leucine into protein was increased in the presence of carbon dioxide. It is suggested that the carbon dioxide stimulated growth of Avena coleoptiles is due to an increased rate of protein synthesis which is dependent on carbon dioxide fixation.

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