The reaction occurs on an immune complex or other non cellular activating surface, then the hydrophobic binding sites cannot anchor the complex and it is released. Released C5b67 complexes can insert into the membrane of nearby cells and mediate “innocent bystander” lysis.

TLS Online TPP Program

#Id: 10160

#Unit 6. System Physiology – Plant

Apical dominance is regulated by sugar availability. After decapitation, sugars, rapidly accumulate in axillary buds, stimulating bud outgrowth.

TLS Online TPP Program

#Id: 10161

#Unit 6. System Physiology – Plant

GA levels in plants are correlated with stem length, internode elongation and seed germination

TLS Online TPP Program

#Id: 10162

#Unit 6. System Physiology – Plant

The biosynthesis of gibberellins is under strict genetic, developmental, and environmental control, and numerous gibberellin-deficient mutants have been isolated. 

Mendel’s tall/dwarf alleles in peas are a famous example. Such mutants have been useful in elucidating the complex pathways of gibberellin biosynthesis.

TLS Online TPP Program

#Id: 10163

#Unit 6. System Physiology – Plant

The biosynthesis of gibberellins is under strict genetic, developmental, and environmental control, and numerous gibberellin-deficient mutants have been isolated.

TLS Online TPP Program

#Id: 10164

#Unit 6. System Physiology – Plant

Gibberellins are synthesized via the terpenoid pathway in three stages in Apical Tissues

TLS Online TPP Program

#Id: 10165

#Unit 6. System Physiology – Plant

GA synthesis starts in plastids, leads to the production of a linear precursor molecule geranylgeranyl diphosphate or GGPP 20C, which gets converted into ent-kaurene. This compound is oxidized in ER, leading to GA12, Dioxygenase enzymes in the cytosol are able to oxidize GA12 to all other gibberellins in pathways