Crassulacean acid metabolism - Wikipedia
Crassulacean acid metabolism photosynthesis: …
-respiration, in which pyruvate is combined with oxygen to form carbon dioxide and water, which creates a lot of ATP per unit of pyruvate (16 I think). Obviously, glycolysis has to happen first, in order to make the pyruvate. This happens in the mitochondrion, which likewise exists in both animals and plants.
Crassulacean Acid Metabolism | ASU - Ask A Biologist
The acidity was found to arise from the opening of their stomata at night to take in CO2 and fix it into malic acid for storage in the large vacuoles of their photosynthetic cells. It could drop the pH to 4 with a malic acid concentration up to 0.3M . Then in the heat of the day, the stomata close tightly to conserve water and the malic acid is decarboxylated to release the CO2 for fixing by the Calvin cycle. PEP is used for the initial short-term carbon fixation as in the , but the entire chain of reactions occurs in the same cell rather than handing off to a separate cell as with the C4 plants. In the CAM strategy, the processes are separated temporally, the initial CO2 fixation at night, and the malic acid to Calvin cycle part taking place during the day.
Crassulacean acid metabolism - Biology-Online Dictionary
Our research aims to elucidate the molecular basis for the circadian regulation of a metabolic adaptation of photosynthesis called Crassulacean acid metabolism (CAM), which is found in plants that inhabit arid and semi-arid regions of the world. We are leading a large DNA sequencing project to decode the transcriptome and genome of a new model CAM species, Kalanchoe fedtschenkoi. We are combining the powers of the Roche 454 GS-FLX Titanium, Applied Biosystems SOLiD4 and Illumina GAii sequencing systems for this sequencing work. K. fedtschenkoi was selected for sequencing because it has the attributes required for an amenable model plant system. In particular, we have developed a simple stable transformation system that allows us to test gene function in planta. Our goal is to identify and characterise the CAMome, the genes required for efficient operation of CAM, including gaining a detailed understanding of which genes mediate the strict circadian control of CAM. To transition this work from model to crop, we are collaborating with Dr. Anne Borland (University of Newcastle), Prof. Andrew Smith (University of Oxford), Prof. Howard Griffiths (University of Cambridge), and Dr. Joe Holtum (James Cook University, Australia) to explore the potential of high-productivity CAM Agaves as new non-food biofuel feedstock crops that can grow on seasonally dry land. We are performing transcriptome sequencing on Agaves in order to identify molecular markers that are linked to high productivity and high sugar content. In a separate collaborative project with Dr. Colin Osborne, University of Sheffield, we are sequencing the C3 and C4 subspecies of the grass, Alloteropsis semialata in order to identify the genes required for C4 photosynthesis. This is the only grass known to possess C3 and C4 species with such a close relationship.