Gibberellins and Bakanae Disease — NEET Biology
📚 Practice ConceptThe 'bakanae' (foolish seedling) disease of rice seedlings, was caused by a fungal pathogen Gibberella fujikuroi. E. Kurosawa (1926) reported the appearance of symptoms of the disease in rice seedlings when they were treated with sterile filtrates of the fungus. The active substances were later identified as gibberellic acid.
Which of the following statements are NOT correct? S1: Plant growth regulators are small, simple molecules of diverse chemical composition that are always synthesised in large amounts. S2: Ethylene can be broadly categorised as a plant growth inhibitor, although it may promote certain growth activities. S3: The first gibberellins were discovered from a fungal pathogen, and all known gibberellins are acidic compounds. S4: Plant development is solely regulated by intrinsic factors like plant growth regulators and genetic control, with no significant environmental influence. S5: Cytokinins play a role in overcoming apical dominance, promoting nutrient mobilisation, and delaying leaf senescence.
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