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Some Characteristics of Crassulacean Acid Metabolism in Five Nonsucculent Scrub Species Under Natural Semiarid Conditions
Abstract
Summary Leaves of five nonsucculent scrub species, Carissa spinarum , Maba buxifolia , Gymnosporia emarginata , Flacourtia sepiaria and Dodonaea viscosa exhibited some features of Crassulacean acid metabolism (CAM) under natural semiarid conditions. The occurrence of some characteristics of CAM in these species was exemplified by the nocturnal stomatal conductance, dark carbon assimilation and high activity of phosphoenolpyruvate carboxylase, resulting in the greater degree of dark acidification. The detection of ribulose bisphosphate carboxylase activity and the low δ 13 C values ranged from -24.5 to -29.1 %0 suggested that these five species also utilize reductive pentose phosphate cycle of photosynthesis. The five species exhibiting some CAM characteristics are suggested to be grouped under flexible CAM species which fix carbon dioxide in the light or darkness under natural semiarid conditions. Further, these five species belonged to five diverse dicotyledonous families which hitherto are not known to possess any CAM characteristics.
  • References (14)
  • Cited By (3)
1967 in planta [IF: 3.36]
Manfred Kluge8
Estimated H-index: 8
(Darmstadt University of Applied Sciences),
Karl Fischer8
Estimated H-index: 8
(Darmstadt University of Applied Sciences)
1. Transpiration und CO2-Aufnahme zeigen bei Bryophyllum daigremontianum sowohl im Licht als auch im Dunkel vollige Gleichlaufigkeit. Die charakteristische Kurve des CO2-Austausches (massive CO2-Aufnahme im Dunkel, teilweise Unterdruckung der CO2-Aufnahme im Licht) bleibt erhalten, wenn die Epidermis der Blatter entfernt wird. Der Rhythmus des Transpirationsverlaufes geht bei dieser Masnahme verloren. Es wird deshalb angenommen, das die mit dem CO2-Austausch verbundenen Ablaufe des Saurestoffwec...
Ref 6Cited 64 Source Cite this paper
C. B. Osmond1
Estimated H-index: 1
(Australian National University)
Photosynthetic metabolism in plants capable of Crassulacean acid metabolism (CAM) may involve the net fixation of CO2 in the preceeding dark period or the net fixation of CO2 in the light. The properties of these two carboxylation reactions have been examined and evidence suggesting that dark fixation is essentially a C4-like process and light fixation is essentially a C3-like photosynthetic process is presented.
Ref 15Cited 31 Download Pdf Cite this paper
1960 in annual review of plant biology [IF: 22.81]
and S L Ranson1
Estimated H-index: 1
,
M Thomas1
Estimated H-index: 1
Cited 208 Source Cite this paper
1975 in botany
E. Nalborczyk1
Estimated H-index: 1
,
L. J. Lacroix1
Estimated H-index: 1
,
R. D. Hill1
Estimated H-index: 1
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 ...
Ref 5Cited 39 Source Cite this paper
A.S. Raghavendra1
Estimated H-index: 1
(Crops Research Institute),
V.S.R. Das1
Estimated H-index: 1
(Sri Venkateswara University)
Summary Malonate inhibited phosphoenolpyruvate carboxylase activity in crude extracts of Setaria italica Beauv. and Pennisetum typhoides S & H leaves. Kinetic studies revealed the competetive inhibition of partially purified phosphoenolpyruvate carboxylase preparation from Setaria italica . Glucose-6-phosphate activated the enzyme. Oxalacetate also competetively inhibited the enzyme and malate in a noncompetetive manner. Results clearly indicated the allosteric nature of phosphoenolpyruvate carb...
Ref 14Cited 26 Source Cite this paper
T. R. Milburn2
Estimated H-index: 2
(Makerere University),
D. J. Pearson1
Estimated H-index: 1
(Makerere University),
N. A. Ndegwe1
Estimated H-index: 1
(Makerere University)
Summary The content of various metabolic intermediates has been determined in material from several species of succulent plants known to show a Crassulacean acid metabolism, grown under natural conditions at Kampala, Uganda. Free titratable acidity, malate, citrate and isocitrate, present in considerable amounts, and various keto-acids present in relatively small amounts, have been measured both at dawn and during the later afternoon. In the case of leaf from two species of Bryophyllum natural c...
Ref 22Cited 56 Source Cite this paper
H. Craig10
Estimated H-index: 10
(University of Chicago)
Abstract Seventy-four mass spectrometric analyses have been made on eight isotopic standards for carbon and oxygen. The standards reported on are the National Bureau of Standards limestone, water, and graphite reference samples, the Solenhofen standard used by Niee for absolute measurements, and the carbonate standards used by the Stockholm, Basel, Wellington and Chicago laboratories. The basic measurements are reported as δ values relative to the Chicago PDB standard and as absolute isotope rat...
Ref 17Cited 3241 Source Cite this paper
A.S. Raghavendra6
Estimated H-index: 6
(Sri Venkateswara University),
V.S.R. Das4
Estimated H-index: 4
(Sri Venkateswara University)
Summary Ribulose diphosphate (RuDP) and phosphoenolpyruvate (PEP) carboxylases were partially purified from leaves of three C 4 plants: Setaria, Pennisetum and Amaranthus and two C 3 plants: Oryza and Rumex . RuDP carboxylase from C 4 plants had a lower Km for RuDP and HCO 3 − than that of the enzyme from C 3 type. Their reaction velocities were similar in all cases, reflecting the potential of RuDP carboxylase in C 4 plants as well as in C 3 plants. PEP carboxylase from C 4 plants possessed hig...
Ref 24Cited 9 Source Cite this paper
1970 in botany
J. A. Berry2
Estimated H-index: 2
,
W. J. S. Downton2
Estimated H-index: 2
,
E. B. Tregunna2
Estimated H-index: 2
Zea mays and Gomphrena globosa form labeled aspartate and malate (C4-acids) via β-carboxylation of P-enolpyruvate during photosynthesis. Studies of the redistribution of 14C in pulse- and chase-type feedings of 14CO2 indicate that most labeled phosphorylated compounds are formed from the C4-acids. A mechanism involving CO2 as a transitory intermediate is advanced to explain the carboxyl transfer from the C4-acids to 3-phosphoglyceric acid (3-PGA). In this model, CO2 is generated through the oxid...
Ref 16Cited 72 Source Cite this paper
  • References (14)
  • Cited By (3)
I. Madhusudana Rao2
Estimated H-index: 2
(Sri Venkateswara University),
P.M. Swamy1
Estimated H-index: 1
(Sri Venkateswara University),
V.S.R. Das4
Estimated H-index: 4
(Sri Venkateswara University)
Summary The influence of two herbicides, paraquat or 2,4,5-T on the in vitro as well as in vivo activity of phosphoenolpyruvate carboxylase from leaves of six nonsucculent scrub species was investigated. The plants, all native and important constituents of the scrubland vegetation, included Carissa spinarum L., Maba buxijolia Cl. , Flacourtia sepiaria Roxb. , Chomelia asiatica O. Kze. , Gymnosporia emarginata Laws. , and Dodonaea viscosa L. The in vitro activity of the enzyme from untreated leav...
Ref 13Cited 1 Source Cite this paper
Craig E. Martin7
Estimated H-index: 7
,
Anne E. Lubbers1
Estimated H-index: 1
,
James A. Teeri1
Estimated H-index: 1
The correlation between succulence and Crassulacean acid metabolism (CAM) was investigated in 28 succulent species growing in various habitats throughout North Carolina. Three species (Opuntia compressa, Agave virginica, and Tillandsia usneoides) exhibited diurnal fluctuations in tissue titratable acidity, nighttime uptake of ~14CO2, and a high carbon isotope ratio (~δ13C), all indicators of CAM. Seven species displayed one or two characteristics of CAM in situ yet yielded lower δ13~C values, in...
Ref 19Cited 25 Download Pdf Cite this paper
Sailaja V. Elchuri6
Estimated H-index: 6
(Sankara Nethralaya),
Govindjee9
Estimated H-index: 9
(University of Illinois at Urbana–Champaign)
We present here the life and research of V. S. Rama Das, a distinguished Indian botanist who specialized in photosynthesis. He was the first to purify chloroplasts that were free of mitochondrial contamination. He then studied C4, C3–C4 intermediate and CAM pathways, as well as their taxonomic distribution in tropical climates. His most valuable legacy is that he, as a philosopher, inspired and guided many students to pursue their research career in India. Also see Narayana and Pullaiah (Eminent...
Ref 42 Download Pdf Cite this paper