scholarly journals Effects of Low Oxygen and High Carbon Dioxide Atmospheres on the Chilling Sensitivity of Cucumber Seedlings

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 539B-539
Author(s):  
Mary E. Mangrich ◽  
Mikal E. Saltveit
Keyword(s):  
Carbon Dioxide ◽  
Chilling Injury ◽  
Chilling Tolerance ◽  
Low Oxygen ◽  
High Carbon ◽  
Radicle Growth ◽  
Cucumber Seedlings ◽  
Carbon Dioxide Levels ◽  
The Individual ◽  
High Carbon Dioxide

Crops with origins in tropics and subtropics undergo physiological injury when subjected to nonfreezing temperatures below 12°C. Application of heat and chemical shocks to tissue prior to chilling induces chilling tolerance. This study was undertaken to investigate the effects of low oxygen and high carbon dioxide atmospheres on subsequent chilling tolerance. Cucumber seedlings (Cucumis sativus L., cv. Poinsett 76) with radicles 8 to 12 mm long were subjected to 0% to 21% oxygen and/or 0% to 20% CO2 atmospheres for 0 to 72 hr at 2.5 or 15°C. After chilling, they were placed at 25°C for three additional days. Radicle growth was used to assess chilling injury. Modification of the individual germination plates was necessary to ensure seedling exposure to the desired atmospheres. Chilling injury was reduced by exposure to oxygen levels below 1% and to carbon dioxide levels above 5%. Effects of brief exposures were small in comparison to prolonged exposures during chilling. Seed to seed variability was high and obscured some results. The effects of the various atmospheres were greater with the less vigorous seedlings.

scholarly journals Effect of. Oxygen and Carbon Dioxide on the Mitochondria of Sclerotium Rolfsh

1969 ◽  
Vol 22 (4) ◽  
pp. 1061
Author(s):  
NG Nair ◽  
NH White ◽  
DM Griffin ◽  
Suzanne Blair§
Keyword(s):  
Carbon Dioxide ◽  
Sclerotium Rolfsii ◽  
Yeast Cells ◽  
Low Oxygen ◽  
High Carbon ◽  
Anaerobic Conditions ◽  
External Stresses ◽  
Carbon Dioxide Levels ◽  
Effect Of Oxygen ◽  
High Carbon Dioxide

The number of mitochondria apparently vary with the energy requirements of the cell (see Rouiller 1960). Although swelling and multiplication of mitochondria have been observed to occur in cells, a quantitative analysis of these changes has not been recorded. Matile and Bahr (1968) have recently provided electron micro-scopic evidence of the heterogeneity of density, mass, and volume of the mitochon-drial population in respiring baker's yeast. There are reports in the literature of the complete absence of mitochondria in yeast cells growing under anaerobic conditions (see Marchant and Smith 1968). Griffin and Nair (1968) demonstrated that the growth of Sclerotium rolfsii was inhibited by concentrations of oxygen below 4% and by concentrations of carbon dioxide above 0�03 %. It was, therefore, thought worthwhile to study the changes in mitochondria of this fungus when the cells are subjected to external stresses of low oxygen and high carbon dioxide levels.

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.

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