Plant phytochrome is an autophosphorylating

serine/threonine kinase that may phosphorylate

other proteins

TLS Online TPP Program

#Id: 3313

#Unit 6. System Physiology – Plant

Plant Mitochondria Have Alternative Mechanisms, In light the principal source of mitochondrial NADH is a reaction in which glycine, produced by a process known as photorespiration, is converted to serine

TLS Online TPP Program

#Id: 3314

#Unit 6. System Physiology – Plant

Plants must carry out this reaction even when they do not need NADH for ATP production

TLS Online TPP Program

#Id: 3315

#Unit 6. System Physiology – Plant

Through Alternative Mechanisms, transfer electrons from unneeded NADH directly to ubiquinone to O2, bypassing Complexes III and IV and their proton pumps, through this process the energy in NADH is dissipated as heat.

TLS Online TPP Program

#Id: 3316

#Unit 6. System Physiology – Plant

The alternative QH2 oxidase is not inhibited by cyanide so that is Cyanide-resistant

TLS Online TPP Program

#Id: 3317

#Unit 6. System Physiology – Plant

Electrons enter the alternative respiratory pathway through the rotenone-insensitive NADH dehydrogenase, the external NADH dehydrogenase, or succinate dehydrogenase (Complex II), and pass to O2 via the cyanide-resistant alternative oxidase, energy is not conserved as ATP but is released as heat.

TLS Online TPP Program

#Id: 3318

#Unit 6. System Physiology – Plant

Electrochemical energy inherent in this difference in proton concentration and separation of charge represents a temporary conservation of much of the energy of electron transfer.