Question

Which of the following secondary metabolites is not commercially produced in vitro in a plant cell culture system?

• A. Shikonin
• B. Gossypol
• C. Berberin
• D. Taxol

Hint:

Shikonin was the "Pioneer" of commercial cell culture. If a compound is already a massive byproduct of an existing crop (like Gossypol in cotton), there is little incentive to grow it in a lab.

Answer 1

The Correct Option is B

Concept: Plant cell culture systems are used for the commercial production of high-value secondary metabolites. Success depends on the ability of cultured cells to synthesize these complex compounds in quantities that make laboratory production more viable than field harvesting.

Step 1: Identifying Successfully Produced Metabolites.
Several compounds are famously produced using bioreactors. Shikonin (1), a red dye and medicinal compound from Lithospermum erythrorhizon, was the first secondary metabolite produced commercially via cell culture. Berberin (3) and Taxol (4) (the anti-cancer drug from Taxus species) are also established products of industrial-scale plant cell fermentation.

Step 2: Analyzing Gossypol.
Gossypol (2) is a natural phenol derived from the cotton plant. While it has various biological activities, it is not currently produced at a commercial scale using in vitro plant cell culture systems. It is generally more economical to extract it directly from cotton seeds, which are produced in massive quantities as a byproduct of the textile industry.

Step 3: Conclusion.
Among the listed options, Gossypol is the outlier that has not transitioned to commercial in vitro production.