The cells found within the most posterior region of the progress zone constitute the zone of polarizing activity.

TLS Online TPP Program

#Id: 8822

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 8824

#Unit 6. System Physiology – Plant

Cyclic electron transport produces only ATP as a product without net production of NADPH.

TLS Online TPP Program

#Id: 8825

#Unit 6. System Physiology – Plant

Cyclic electron transport pathway is catalyzed by the NADH dehydrogenase‐like (NDH) complex in the thylakoid

membrane. This large complex is similar to mitochondrial Complex I,

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#Id: 8826

#Unit 6. System Physiology – Plant

The NDH pathway is especially prominent during oxidative stress. 

The second pathway involves a ferredoxin‐quinone oxidoreductase that is sensitive to antimycin A.

TLS Online TPP Program

#Id: 8827

#Unit 6. System Physiology – Plant

Some of the cytochrome b6 f complexes are found in the stroma region of the membrane, where photosystem I is located. Under certain conditions cyclic electron flow from the reducing side of photosystem I, through the b6 f complex and back to P700, is known to occur.

TLS Online TPP Program

#Id: 8828

#Unit 6. System Physiology – Plant