Gibberllin - Gibberllin Foolish seeding disease The fungus...

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Gibberllin Foolish seeding disease The fungus Gibberella fujukuroi causing Bakanae disease Infected rice grow tall and slender, and are male sterile The fungus produces GA later recognized as a natural plant hormone GA synthesis Synthesized from the diterpene geranylgeranyl diphosphate (GGPP) via ent-kaurene and ent-gibberellane All based on ent-gibberellane, but some lose a carbon (C19- GAs) Over 130 different gibberellins, numbered GAi- GAn based on order of discover Numbering is based on structure, not activity GAs can be deactivated several ways Figure 20.5 GA synthesis mutants Early steps in the pathway tend to be single genes and mutation results in an extreme dwarf phenotype Middle steps in the pathway are accomplished by several partially-redundant genes, so mutation results in a semi-dwarf phenotype “Dwarf” varieties of plants tend to be semi-dwarves, actually The end of the pathway is deactivation of GAs and mutations here result in a slender phenotype Figure 20.7 GA transport Long-distance GA transport not well understood GA can move through a graft and transport is not polar Short-distance GA transport occurs during seed germination GA signaling Some dwarf mutants respond to GA treatment But not all do
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