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Hormones213-page11 - seedling" disease The fungus...

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Plant Growth Regulators - 11 Some pathogens that promote tumor formation, called galls in plants, take advantage of cytokinin function. The bacteria that form these tumors contain genes for the synthesis of cytokinins, resulting in rapid undifferentiated cell growth in the infected part of the plant. Agrobacterium tumefaciens , a common vector in plant biotechnology contains such genes. Gibberellins Ewiti Kurosawa is credited with the discovery of gibberellins when he determined that a fungus was responsible for abnormal rice seedling growth, called the "foolish
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Unformatted text preview: seedling" disease. The fungus secreted a chemical that caused the rice plants to grew abnormally long, and then collapse from weakness. The fungus was Gibberella fujikuroi , hence the hormone name. Normal and foolish rice Gibberellin Gene Activity As does auxin, gibberellin stimulates transcription by activating a receptor molecule to first bind to a gene repressor molecule and tag the repressor with ubiquitin, which will direct the repressor molecule to a proteasomes for degradation....
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