Bombay phenotype

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#Id: 7286

#Unit 6. System Physiology – Plant

That time, there was no selective pressure for rubisco to discriminate between CO2 and O2. 

The Km for CO2 is about 9 microM, and that for O2 is about 350 microM. The modern atmosphere contains about 20% O2 and only 0.04% CO2, so an aqueous solution in equilibrium with air at room temperature contains about 250 microM O2 and 11 microM CO2—concentrations that allow significant O2 “fixation” by rubisco and thus a significant waste of energy.

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#Unit 6. System Physiology – Plant

The temperature dependence of the solubilities of O2 and CO2 is such that at higher temperatures, the ratio of O2 to CO2 in solution increases. In addition, the affinity of rubisco for CO2 decreases with increasing temperature, exacerbating its tendency to catalyze the wasteful oxygenase reaction, favoring the oxygenase reaction.

TLS Online TPP Program

#Id: 7288

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7289

#Unit 6. System Physiology – Plant

Glycine decarboxylase GDC multienzyme complex, present in large concentrations in the matrix of plant mitochondria, comprises four proteins, named 

H-protein (a lipoamide-containing polypeptide), 

P-protein (a 200 kDa, homodimer, pyridoxal phosphate-containing protein),

T-protein (a folate-dependent protein), and 

L-protein (a flavin adenine nucleotide–containing protein

Glycine decarboxylase GDC multienzyme complex, present in large concentrations in the matrix of plant mitochondria, comprises four proteins, named 

H-protein (a lipoamide-containing polypeptide), 

P-protein (a 200 kDa, homodimer, pyridoxal phosphate-containing protein),

T-protein (a folate-dependent protein), and 

L-protein (a flavin adenine nucleotide–containing protein

TLS Online TPP Program

#Id: 7290

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7291

#Unit 6. System Physiology – Plant

The C4 plants, which typically grow at high light intensity and high temperatures, have several important characteristics: high photosynthetic rates, high growth rates, low photorespiration rates, low rates of water loss, and a specialized leaf structure