DnaA ATPase activity is stimulated by membrane phospholipids and single-stranded DNA.

TLS Online TPP Program

#Id: 10183

#Unit 6. System Physiology – Plant

Brassinosteroids are also required for promotion of cell

elongation by gibberellins, and gibberellin-induced degradation of the DELLA repressor enhances the brassinosteroid response

TLS Online TPP Program

#Id: 10184

#Unit 6. System Physiology – Plant

Gibberellin appears to promote flowering in Arabidopsis by activating expression of the LEAFY gene.

The activation of LFY by gibberellin is mediated by the

transcription factor GA-MYB

TLS Online TPP Program

#Id: 10185

#Unit 6. System Physiology – Plant

Ratio of GA:ABA affects early germination (vivipary). 

With high levels of ABA, seeds remain dormant.

TLS Online TPP Program

#Id: 10186

#Unit 6. System Physiology – Plant

Cytokinins are defined as compounds that have biological activities similar to those of trans-zeatin.

TLS Online TPP Program

#Id: 10187

#Unit 6. System Physiology – Plant

Induce cell division in callus cells in the presence of an auxin

Promote bud or root formation from callus cultures when in the appropriate molar ratios to auxin

Delay senescence of leaves

Promote expansion of dicot cotyledons

TLS Online TPP Program

#Id: 10188

#Unit 6. System Physiology – Plant