Gibberellins: Chemical nature, Biosynthesis, Bioassay, Physiological effects and Mode of action
Gibberellins:- 1. Discovery of Gibberellins:- It was discovered by Kurosawa. In 1926, Japanese scientist Eiichi Kurosawa identified that foolish seedling disease was caused by the fungus Gibberella fujikuroi. Later work at the University of Tokyo showed that a substance produced by this fungus triggered the symptoms of foolish seedling disease and they named this substance "gibberellin". 2. Chemical of Gibberellins:- Gibberellins are tetracyclic diterpenes with an ent-gibberellane ring structure. 3. Biosynthesis of Gibberellins:- Gibberellins are synthesized inside the plastids of immature seeds, young leaves and even the roots. They are synthesized from acetate units of acetyl coenzyme A by the mevalonic pathway. The following steps are involved in the biosynthesis of gibberellins: > Synthesis of gibberellins begins with acetate molecule. Acetate is esterified with coenzyme (CoA) to form three acetyl coenzyme A (acetyl Co A) molecules which undergoes a series of co...