In addition to proteins involved in NER, a variant form of XP called XP-V is caused by a defect in the translesion DNA polymerase, Pol h. The gene encoding Pol h is sometimes called XPV. Individuals with XP-V have a milder form of XP.

TLS Online TPP Program

#Id: 5103

#Unit 6. System Physiology – Plant

Phytochrome interacting factors (PIFs) act as negative regulators of photomorphogenesis.

TLS Online TPP Program

#Id: 5104

#Unit 6. System Physiology – Plant

PIFs promote etiolated development in the dark (skotomorphogenesis) primarily by serving as transcriptional activators of dark induced genes.

TLS Online TPP Program

#Id: 5105

#Unit 6. System Physiology – Plant

PIFs as constitutive transcriptional activators in the dark

TLS Online TPP Program

#Id: 7100

#Unit 6. System Physiology – Plant

The response to ethylene is very rapid and causes triple response which is

Reduced elongation

Hypocotyl swelling

Apical hook exaggeration

TLS Online TPP Program

#Id: 7101

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7102

#Unit 6. System Physiology – Plant

Aminoethoxy-vinylglycine (AVG) and aminooxyacetic acid (AOA) block the conversion of AdoMet to ACC.

AVG and AOA are known to inhibit enzymes that use the cofactor pyridoxal phosphate. The cobalt ion (Co2+) is also an inhibitor of the ethylene biosynthetic pathway, blocking the conversion of ACC to ethylene by ACC oxidase, the last step in ethylene biosynthesis