Lecture+6-Gibberellins+_+Plant+Development

Lecture+6-Gibberellins+_+Plant+Development -...

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9/19/2011 1 Gibberelins(GAs) & Plant development Discovered due to a disease in rice caused by the fungus Gibberella fujikuroi. Fungus produces GAs that result in internode growth (stem elongation). Structure of GAs There are about 136 GAs GAs are diterpenoids Biological activity depends on the structure of the molecule C20 - C19 Inactive Active Biosynthesis of GAs Terpenoid pathway Isopentenyl Diterpenes (C20) diphosphate (pyrophosphate) GAs (active) GAs (inactive)
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9/19/2011 2 20.6 The three stages of GA biosynthesis GA synthesis mutant le WT 3- β -hydroxylase GA 20 GA 1 20.1 The effect of exogenous GA 1 on wild-type and dwarf ( d1 ) maize
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9/19/2011 3 20.2 Cabbage can be induced to bolt and flower by applications of GA 3 Physiological roles of GAs Promote elongation of axial organs (Bolting of rosette plants e.g. Cabbage, Celery, Spinach). 20.3 Gibberellins induce conebud formation in juvenile conifers Physiological roles of GAs Regulates transition from juvenile to adult phase (In English Ivy it
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Lecture+6-Gibberellins+_+Plant+Development -...

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