What is "gibberella fujikuroi"

gibberellic acid \gibberellic acid\ n. (Chem.), A plant growth hormone of the gibberellin series ( C19H22O6), also called gibberellin A3. It was first isolated from the fungus Gibberella fujikuroi. It is used to promote the growth of seedlings. See also gibberellin.
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gibberellin \gibberellin\ n. (Chem.), Any of a number plant growth hormones, the first of which was isolated in 1938 from the fungus Gibberella fujikuroi; more than 60 related gibberelins are known. The most important is gibberellin A3, also called gibberellic acid. They are used in agriculture for promoting plant growth.

Gibberella fujikuroi is a fungal plant pathogen. It causes bakanae disease in rice seedlings by overloading them with the phytohormone gibberellin as its own metabolic byproduct.