Lecture13 Herbicide resistant plants. The Roundup Ready Story Glyphosate is a broad-spectrum herbicide Active ingredient in Roundup herbicide Kills.

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Presentation transcript:

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 Plants die because they lack the key amino acids A resistant EPSP synthase gene allows crops to survive spraying

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

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