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Lecture13

Lecture13. Herbicide resistant plants. The Roundup Ready Story. Glyphosate is a broad-spectrum herbicide. Active ingredient in Roundup herbicide Kills all plants it come in contact with Inhibits a key enzyme ( EPSP synthase ) in an amino acid pathway.

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Lecture13

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  1. Lecture13 Herbicide resistant plants

  2. The Roundup Ready Story • Glyphosate is a broad-spectrum herbicide • Active ingredient in Roundup herbicide • Kills all plants it come in contact with • Inhibits a key enzyme (EPSP synthase) in an amino acid pathway • Plants die because they lack the key amino acids • A resistant EPSP synthase gene allows crops • to survive spraying

  3. Shikimic acid + Phosphoenol pyruvate Plant EPSP synthase 3-Enolpyruvyl shikimic acid-5-phosphate (EPSP) Aromatic amino acids Roundup Sensitive Plants + Glyphosate X X Without amino acids, plant dies X X

  4. Roundup Resistant Plants Shikimic acid + Phosphoenol pyruvate + Glyphosate RoundUp has no effect; enzyme is resistant to herbicide Bacterial EPSP synthase 3-enolpyruvyl shikimic acid-5-phosphate (EPSP) With amino acids, plant lives Aromatic amino acids

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