Finally, the single-stranded stretch including the damaged bases can then be replaced by new synthesis, and the final remaining nick is ligated by a complex of ligase III and XRCC1.

TLS Online TPP Program

#Id: 7110

#Unit 6. System Physiology – Plant

In banana, ripening is characterized by a climacteric rise in

respiration rate, as evidenced by the increased CO2 production.

A climacteric rise in ethylene production precedes the increase in CO2 production, suggesting that ethylene is the hormone that triggers the ripening process.

TLS Online TPP Program

#Id: 7111

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7112

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7113

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7114

#Unit 6. System Physiology – Plant

In the absence of ethylene, ETR1 and the other ethylene receptors activate the kinase activity of CTR1. This leads to a repression of the ethylene response pathway, possibly through a MAP kinase cascade. 

The binding of ethylene to the ETR1 dimer results in its inactivation, which causes CTR1 to become inactive.

TLS Online TPP Program

#Id: 7115

#Unit 6. System Physiology – Plant

ETO- and CTR- Mutants gives constitutive triple response

CTR- mutants always gives constitutive triple response

CTR1 appears to be related to RAF-1, a MAPKKK serine/ threonine protein kinase