scholarly journals The Dark Fixation of Carbon Dioxide as a Factor in Photoperiodism

1954 ◽  
Vol 29 (5) ◽  
pp. 436-440 ◽  
Author(s):  
Ruble Langston ◽  
A. C. Leopold
Keyword(s):  
Carbon Dioxide ◽  
Dark Fixation ◽  
Fixation Of Carbon Dioxide

EFFECT OF WATER STRESS ON RESPIRATION OF WHEAT

1966 ◽  
Vol 44 (5) ◽  
pp. 623-632 ◽  
Author(s):  
Rudolf Kaul
Keyword(s):  
Carbon Dioxide ◽  
Water Stress ◽  
Organic Acid ◽  
Simple Method ◽  
Wheat Seedlings ◽  
Respiration Rates ◽  
Severe Water Stress ◽  
Dark Fixation ◽  
Fixation Of Carbon Dioxide ◽  
Progressive Water Stress

A simple method of subjecting wheat seedlings to progressive water stress and of measuring the respiration rates is described. Slight water deficits increased CO2 output by about 20%, and more severe water stress decreased it by about 50%. Water stress caused significant changes in the concentrations of malate and citrate and of an unknown organic acid. Water stress strikingly decreased the level of malate in the roots and increased it in the shoots. It is suggested that the decrease in respiration caused by water stress cannot be attributed to an increased rate of dark fixation of carbon dioxide.

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