Discussion
Identify the CORRECT statements in plant secondary metabolism.
P. Tropane alkaloids in Atropa belladonna are synthesized from tyrosine
Q. Antioxidative food ingredient rosmarinic acid is obtained from cell suspension cultures of Coleus blumei
R. Thiophenes are produced from hairy root cultures of Tagetes patula
S. Cyanidin, the principal anthocyanin responsible for red color in Rosa hybrida is produced from cinnamaldehyde
Answer: D
The correct statements are Q, R.
Q is correct: cell suspension cultures of Coleus blumei accumulate rosmarinic acid in high yield and are a well-known example of producing this antioxidant in culture. R is correct: hairy root cultures of Tagetes patula (French marigold), produced by Agrobacterium rhizogenes, synthesise nematicidal thiophenes.
P is false: the tropane alkaloids of Atropa belladonna, such as hyoscyamine, derive from ornithine (or arginine) through putrescine, not from tyrosine. S is false: cyanidin is made via the phenylpropanoid and flavonoid pathway from phenylalanine, through p-coumaroyl CoA and chalcone, not from cinnamaldehyde. So pairs with P or S are excluded.
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