scholarly journals Corrigendum - Temperature Dependence of Dark CO2 Fixation and Acid Accumulation in Kalanchoe daigremontiana

1981 ◽  
Vol 8 (6) ◽  
pp. 641 ◽  
Author(s):  
E Medina ◽  
CB Osmond
Keyword(s):  
Temperature Dependence ◽  
Co2 Fixation ◽  
Acid Accumulation ◽  
Dark Co2 Fixation ◽  
Kalanchoë Daigremontiana ◽  
Kalanchoe Daigremontiana

scholarly journals Temperature Dependence of Dark CO2 Fixation and Acid Accumulation in Kalanchoe daigremontiana

1981 ◽  
Vol 8 (6) ◽  
pp. 641
Author(s):  
E Medina ◽  
CB Osmond
Keyword(s):  
Co2 Fixation ◽  
Acid Synthesis ◽  
Total Acid ◽  
Free Air ◽  
Acid Accumulation ◽  
Effects Of Temperature ◽  
Nocturnal Acid Accumulation ◽  
Dark Co2 Fixation ◽  
Kalanchoë Daigremontiana ◽  
Kalanchoe Daigremontiana

Kalanchoe daigremontiana was grown at 25/15 and 34/24°C and net CO2 fixation and acid synthesis were measured at 8, 15 and 24°. The ratio of net dark CO2 fixation to acid accumulation was nearly 1 at all temperatures tested. Although the increased contribution of respiratory CO2 to total acid synthesis at high temperatures was demonstrated by incubating leaf discs in CO2-free air, it was not enough to account for the reduction of dark CO2 fixation. Plants grown at 25/15° temperature regime showed maximal rates of nocturnal acid accumulation at 15°, the rates decreasing markedly at 24°. Plants grown at 24/34° showed similar rates at 15 and 24°, but acid accumulation was significantly lower at 8°. Measurements of dark acid accumulation in CO2-free air indicated that 34/24° plants have reduced respiration rates in comparison with 25/15° plants. These observations are discussed in relation to hypotheses seeking to account for effects of temperature on crassulacean acid metabolism.

Environmental influences on light and dark CO2 fixation by Kalanchoe daigremontiana

1975 ◽  
Vol 53 (11) ◽  
pp. 1132-1138 ◽  
Author(s):  
E. Nalborczyk ◽  
L. J. Lacroix ◽  
R. D. Hill
Keyword(s):  
Co2 Fixation ◽  
Red Light ◽  
Day Length ◽  
Low Oxygen ◽  
Long Day ◽  
C Value ◽  
Warm Night ◽  
Dark Co2 Fixation ◽  
Kalanchoë Daigremontiana ◽  
Kalanchoe Daigremontiana

The influence of day length, light quality, temperature, drought, and oxygen concentration on gas exchange of Kalanchoe daigremontiana was investigated. The ratio of photosynthesis to dark CO2 fixation with plants under a long-day and short-warm-night regime was 2.0 and under a short-day and long-cool-night regime, 0.2. With drought conditions this value may be less than 0.02. Under low oxygen concentrations high photosynthetic rates of about 20 mg CO2 dm−2 h−1 were observed with a compensation point of about 20 ppm. Restricting CO2 supply to dark periods produced plants with a δ13C value of −10.6‰. Restricting CO2 supply to light periods gave a δ13C value of −25.9‰, whereas no control of CO2 gave δ13C values of −15‰. The data obtained suggest that variations in δ13C values in Kalanchoe result from changes in the proportion of light and dark CO2 fixation.Far-red light and oxygen promoted the release of CO2 from Kalanchoe after the plants had undergone a period of dark CO2 fixation. Maximum release occurred within about 1 h. The effect could be reversed by removal of either far-red light or oxygen. Decreases in the acidity of the plants accompanied CO2 release, which indicated that decarboxylation of a C4 acid was the source of the CO2.

Pathways of CO2 Fixation in the CAM Plant Kalanchoe daigremontiana. II* Effects of O2 and CO2 Concentration on Light and Dark CO2 Fixation

1975 ◽  
Vol 2 (2) ◽  
pp. 155
Author(s):  
C.B Osmond ◽  
O Bjorkman
Keyword(s):  
Steady State ◽  
Oxygen Concentration ◽  
Co2 Fixation ◽  
Co2 Concentration ◽  
Compensation Point ◽  
Lower Affinity ◽  
High Affinity ◽  
Cam Plant ◽  
Dark Co2 Fixation ◽  
Kalanchoë Daigremontiana

Steady-state fixation of CO*2 by leaves of K. daigremontiana was examined at O*2 concentrations of 4, 20 and 36%. Oxygen concentration had no effect on the rate of dark CO*2 fixation, whereas CO*2 fixation in the light was substantially inhibited by 20 and 36% O*2. Dark CO*2 fixation showed a high affinity for CO*2 (half-saturated at about 3 �M at 16�C) whereas CO*2 fixation in the light showed a much lower affinity for CO*2 (half-saturated at about 9 �M at 16�C and 37 �M at 29�C). The inhibition by O*2 of CO*2 fixation in the light was observed at intercellular CO*2 pressures up to 850 �bar. It was associated with a positive CO*2 compensation point which was abolished in 4% O*2, and a post- illumination burst of CO*2 evolution which was not modified by low O*2. The response of dark and light CO*2 fixation in K. daigremontiana to O*2 concentration is discussed in comparison with photosynthetic CO*2 fixation in C*3 and C*4 plants.

scholarly journals Dark CO2 Fixation and its Role in the Growth of Plant Tissue

1966 ◽  
Vol 41 (5) ◽  
pp. 755-759 ◽  
Author(s):  
Walter E. Splittstoesser
Keyword(s):  
Plant Tissue ◽  
Co2 Fixation ◽  
Dark Co2 Fixation

Pod photosynthesis and seed dark CO2 fixation support oil synthesis in developingBrassica seeds

1995 ◽  
Vol 20 (1) ◽  
pp. 49-58 ◽  
Author(s):  
H. R. Singal ◽  
Gurmeet Talwar ◽  
Anita Dua ◽  
Randhir Singh
Keyword(s):  
Co2 Fixation ◽  
Oil Synthesis ◽  
Pod Photosynthesis ◽  
Dark Co2 Fixation
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