Doublet contains one complete 13-protofilament microtubule (A tubule) and one additional tubules (B tubule) consisting of 10 protofilaments.

 

TLS Online TPP Program

#Id: 9001

#Unit 6. System Physiology – Plant

The products of the catalytic cycle are either two molecules of 3-phosphoglycerate (carboxylase activity) or one molecule each of 3-phosphoglycerate and 2-phosphoglycolate (oxygenase activity).

TLS Online TPP Program

#Id: 9002

#Unit 6. System Physiology – Plant

Prior to CO2 fixation, Activation of RUBISCO/Carbamylation of RUBISCO takes place

1. Two protons are released. 

2. Binding of CO2 molecule on NH2 group

3. Binding of Mg2+ concentration upon illumination

TLS Online TPP Program

#Id: 9003

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 9004

#Unit 6. System Physiology – Plant

CO2 functions both as an activator and as a substrate in the reaction catalyzed by rubisco.

TLS Online TPP Program

#Id: 9005

#Unit 6. System Physiology – Plant

Most of the regulation between nucleus and plastids is anterograde: products of nuclear genes control the transcription and translation of plastid genes..

TLS Online TPP Program

#Id: 9006

#Unit 6. System Physiology – Plant

The signals flow from the chloroplast to the nucleus is retrograde:

plastidial ferrochelatase I catalyzes the synthesis of heme, which in turn regulates the expression of nuclear encoded, chloroplast‐targeted proteins in greening leaves.