scholarly journals High light-induced switch from C3-photosynthesis to Crassulacean acid metabolism is mediated by UV-A/blue light

2002 ◽  
Vol 53 (373) ◽  
pp. 1475-1483 ◽  
Author(s):  
T. E. E. Grams
Keyword(s):  
Blue Light ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
High Light ◽  
C3 Photosynthesis

scholarly journals High light‐induced switch from C 3 ‐photosynthesis to Crassulacean acid metabolism is mediated by UV‐A/blue light

2002 ◽  
Vol 53 (373) ◽  
pp. 1475-1483
Author(s):  
Thorsten E. E. Grams ◽  
Stephan Thiel
Keyword(s):  
Blue Light ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
High Light

scholarly journals Large-scale mRNA expression profiling in the common ice plant, Mesembryanthemum crystallinum, performing C3 photosynthesis and Crassulacean acid metabolism (CAM)

2008 ◽  
Vol 59 (7) ◽  
pp. 1875-1894 ◽  
Author(s):  
John C. Cushman ◽  
Richard L. Tillett ◽  
Joshua A. Wood ◽  
Joshua M. Branco ◽  
Karen A. Schlauch
Keyword(s):  
Mrna Expression ◽  
Expression Profiling ◽  
Crassulacean Acid Metabolism ◽  
Large Scale ◽  
Acid Metabolism ◽  
Mesembryanthemum Crystallinum ◽  
Ice Plant ◽  
C3 Photosynthesis ◽  
The Common ◽  
Mrna Expression Profiling

scholarly journals Phosphoenolpyruvate carboxylase from pennywort (Umbilicus rupestris). Changes in properties after exposure to water stress

1984 ◽  
Vol 218 (2) ◽  
pp. 387-393 ◽  
Author(s):  
P P Daniel ◽  
J A Bryant ◽  
F I Woodward
Keyword(s):  
Water Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Marked Decrease ◽  
Cam Plants ◽  
Allosteric Inhibitor ◽  
Allosteric Effector ◽  
Incomplete Form ◽  
C3 Photosynthesis

Umbilicus rupestris (pennywort) switches from C3 photosynthesis to an incomplete form of crassulacean acid metabolism (referred to as ‘CAM-idling’) when exposed to water stress (drought). This switch is accompanied by an increase in the activity of phosphoenolpyruvate carboxylase. This enzyme also shows several changes in properties, including a marked decrease in sensitivity to acid pH, a lower Km for phosphoenolpyruvate, very much decreased sensitivity to the allosteric inhibitor malate, and increased responsiveness to the allosteric effector glucose 6-phosphate. The Mr of the enzyme remains unchanged, at approx. 185 000. These changes in properties of phosphoenolpyruvate carboxylase are discussed in relation to the roles of the enzyme in C3 and in CAM plants.

Influence of nitrogen supply on the photoprotective response of Neoregelia cruenta under high and low light intensity

2002 ◽  
Vol 29 (6) ◽  
pp. 757 ◽  
Author(s):  
Janaina Fernandes ◽  
Ricardo M. Chaloub ◽  
Fernanda Reinert
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Nitrogen Limitation ◽  
Acid Metabolism ◽  
Light Exposure ◽  
Tap Water ◽  
High Light ◽  
Carotenoid Content ◽  
Sand Ridge ◽  
High Nitrogen ◽  
Low Light

This paper originates from a presentation at the IIIrd International Congress on Crassulacean Acid Metabolism, Cape Tribulation, Queensland, Australia, August 2001. We investigated preference for nitrogen source and the influence of ammonium nitrate on leaf pigment content, crassulacean acid metabolism (CAM) activity, and the efficiency of PSII in Neoregelia cruenta (R.Graham) L.B. Smith, a CAM bromeliad of major ecological importance to restinga (coastal sand ridge plains) environments. Plants showed a preference for ammonium over nitrate in a 24-h experiment where plants were exposed to 15NH4NO3 or NH415NO3. Mature individuals of N. cruenta were exposed to 95 and 20% full sunlight, and treated with 5 mm NH4NO3 or tap water only. After 4 months under the different treatments we found that nitrogen uptake and carotenoid content were independent of light exposure. Total chlorophyll decreased under nitrogen limitation and high light. Net titratable acid accumulation was not influenced by light or nitrogen regimes. Plants under low light showed consistently high photochemical efficiency of PSII (Fv/Fm) throughout the day. In contrast, plants under high light and nitrogen limitation showed a significant decline in Fv/Fm around midday, which recovered by the end of the light period. This decline in Fv/Fm was attributed to increased non-photochemical quenching. Our findings that plants under high light and with high nitrogen behave similarly to shade plants were unexpected. They suggest that the high light, high nitrogen leaves used a greater portion of the light absorbed in PSII antennae for photochemistry than the high light, low nitrogen plants. High nitrogen content in the leaves of N. cruenta appears to protect this CAM bromeliad against photoinhibition.

Carbohydrate partitioning in the leaves of Bromeliaceae performing C3 photosynthesis or Crassulacean acid metabolism

1998 ◽  
Vol 25 (3) ◽  
pp. 371 ◽  
Author(s):  
John T. Christopher ◽  
Joseph A. M. Holtum
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Soluble Sugars ◽  
Carbohydrate Accumulation ◽  
Carbohydrate Partitioning ◽  
C3 Species ◽  
C3 Photosynthesis ◽  
Cam Species

Carbohydrate accumulation was measured in the leaves of 11 speciesrepresenting the three subfamilies of Bromeliaceae. In the Tillandsioideae the C3 species Vriesea carinata Wawra accumulated starch and sucrose while the Crassulacean acid metabolism (CAM)species Tillandsia tricolor Schlechtendal & Chamissoaccumulated mainly starch. In the Pitcairnioideae the C3species Pitcairnia paniculata Ruiz & Pavon and two CAM species Dyckia sp. andFosterella schidosperma Barker accumulated sucrose butnot starch. Of six CAM species in the Bromelioideae, threeCryptanthus zonatus (Visiani) Beer,Neoregalia spectabilis Moore andPortea petropolitana Wawra accumulated starch but notsoluble sugars while three (Ananus comosus Linnaeus,Orthophytum vagans M.B. Foster andNidularium bilbergioides Schultes filius) accumulatedstarch as well as soluble sugars. Carbohydrate accumulation patterns weresimilar for species within each subfamily in that the Pitcairnioideae speciesdid not accumulate starch but accumulated sucrose while species from theTillandsioideae and Bromelioideae all accumulated starch (some alsoaccumulated soluble sugars). Carbohydrate accumulation patterns were notsimilar for C3 species versus CAM species from thedifferent subfamilies. These data suggest that variations in carbohydratebiochemistry resulting from different evolutionary histories have a greaterinfluence on carbohydrate accumulation patterns in CAM bromeliads than theconstraints of the CAM pathway itself.

scholarly journals C3 Photosynthesis and Crassulacean Acid Metabolism in a Kansas Rock Outcrop Succulent, Talinum calycinum Engelm. (Portulacaceae)

1983 ◽  
Vol 73 (3) ◽  
pp. 718-723 ◽  
Author(s):  
Craig E. Martin ◽  
Aaron Klaas Zee
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Rock Outcrop ◽  
C3 Photosynthesis
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