Science and Technology Part 3: GM Crops — Bt Cotton to the Mustard Debate, Exam-Ready Notes

Category: Civil Exams · Series: Science and Technology (GS Paper 3) · Read time: ~9 minutes

GM-crop questions test the science (Bt and HT mechanisms), the regulation (the GEAC stack), and the case file (Bt cotton’s lessons, the mustard saga, the 2024 Supreme Court verdict). This note covers all three layers.

Table of Contents

1. The Science: What Bt and HT Actually Do
2. The Regulation Stack
3. Bt Cotton: The Record and the Lessons
4. The Mustard Saga and the 2024 SC Verdict
5. The Debate: Food Security vs Biosafety
6. How Exams Probe This Topic
7. Quick Revision: One-Glance Facts

1. The Science: What Bt and HT Actually Do

• The technique. GM = transgene insertion (Agrobacterium or gene-gun methods) conferring a trait — insect resistance, herbicide tolerance, biofortification.
• Bt. The soil bacterium Bacillus thuringiensis‘s Cry genes produce crystal proteins that lyse the targeted pest’s gut — pest-specific (bollworm), not a broad poison; India’s cotton stacks cry1Ac + cry2Ab.
• HT and the mustard design. Herbicide tolerance uses genes tolerating glyphosate or glufosinate. DMH-11 mustard uses the barnase-barstar system: barnase causes male sterility, barstar restores fertility — a hybrid-seed production technology for a self-pollinating crop; the glufosinate-tolerance (bar) gene is incidental to the hybrid logic — the science detail that corrects the public misreading of DMH-11 as primarily an HT crop.
• Gene editing — the frontier. CRISPR’s SDN-1/SDN-2 edits (no foreign gene) are exempted from GM-rules handling per the 2022 environment ministry guidance — the “edited, not transgenic” distinction now shaping regulation.

2. The Regulation Stack

• The card. The Rules of 1989 under the EPA 1986; the GEAC (Genetic Engineering Appraisal Committee, MoEFCC) — environmental release decisions; the RCGM (Review Committee on Genetic Modification, under DBT) — research-stage and BRL-I trials; the IBSC — institutional biosafety first line; plus the state-level no-objection requirement for field trials — the layer where several states historically refused.
• The reform debates. The lapsed BRAI bill (2013) proposed a single-window regulator; critics of GEAC question its independence and capacity; the “appraisal vs approval” naming debate continues.

3. Bt Cotton: The Record and the Lessons

• The card. Approved 2002 (Bollgard-I), 2006 (Bollgard-II stacked); adoption now ~96% of India’s cotton area (~11 million hectares, the world’s largest Bt cotton area) — delivered only as hybrids, not varieties (unlike China/US) — with seed-price controls and trait-fee disputes layered on.
• The record. Yields jumped in 2002-08 (~300 to ~500+ kg/ha with pesticide savings) — then plateaued; the pink bollworm’s Bt resistance (2015-21) traced to refugia non-compliance and the hybrid system; illegal unapproved HT cotton’s spread (2017-19) evidenced regulatory leakage.
• The lesson set. Resistance management works only with compliance; hybrids cap yields; regulation must anticipate black markets — the three lines a mains answer uses.

4. The Mustard Saga and the 2024 SC Verdict

• The journey. Delhi University’s Deepak Pental team developed DMH-11; the GEAC recommended approval in 2017; the Aruna Rodrigues PIL challenged it; the GEAC re-recommended in 2022 with fresh biosafety data; the Supreme Court’s July 2024 judgment dismissed the challenge — upholding the approval process in principle while directing expert-committee review and strengthened post-release monitoring (a split bench, with the dissent favouring more precaution).
• The current status. Environmental release and seed development proceed, but commercial cultivation has not yet reached farmers’ fields — the honest status line; verify the latest before your exam.

5. The Debate: Food Security vs Biosafety

• The pro case. The edible-oil import bill (~$15-20 billion) makes mustard self-reliance strategic; pesticide reduction; climate-resilience and biofortification potential.
• The cautious case. Biosafety unknowns (allergenicity, gene flow to wild relatives); seed sovereignty and corporate control concerns; the Bt resistance lessons; regulatory-capacity doubts — the Technical Expert Committee (2013) had recommended an indefinite moratorium on HT and food-crop GM trials, a recommendation the government did not accept.
• The balanced verdict. Case-by-case approval with strong regulation; the mustard’s hybrid-logic and the cotton’s resistance-lessons as the two reference points; gene-editing’s exemption as the pragmatic middle path.

6. How Exams Probe This Topic

• Prelims: the Cry mechanism; DMH-11’s barnase-barstar design; GEAC’s ministry (MoEFCC) and the 1989 Rules; Bt cotton 2002/2006 and ~96% adoption; the 2010 brinjal moratorium; the SDN-1/2 exemption; the 2024 verdict.
• Mains: “The GM mustard journey reflects the science-society-regulation tension — examine with the 2024 verdict”; “Bt cotton’s two decades offer lessons for GM policy — discuss”; “Gene editing vs transgenics: the regulatory distinction and its implications.”

7. Quick Revision: One-Glance Facts

• Science. Cry-gene gut lysis; DMH-11 = hybrid technology; SDN-1/2 exempt.
• Regulation. 1989 Rules (EPA 1986); GEAC (MoEFCC)-RCGM (DBT)-IBSC stack; the 2024 conditional uphold.
• Bt cotton. 2002/2006; ~96%; pink-bollworm resistance; ~500-kg plateau; illegal HT spread.
• Cases. Brinjal 2010 moratorium; Bangladesh’s Bt brinjal contrast; mustard’s 2024 verdict.

Conclusion. The GM file is one science detail (DMH-11’s hybrid design), one institutional stack (the GEAC family), and two cases (cotton’s lessons, mustard’s limbo) — argued through the food-security-vs-biosafety frame with the 2024 verdict and gene-editing exemption as current hooks.

The Bt Cotton Numbers Debate (The Mains Evidence Pack)

The yield story in data: Indian cotton yields rose from roughly 300 kg/ha in 2002-03 to a ~500 kg/ha plateau in the 2010s — a genuine Bt-era gain, but one that China’s non-hybrid Bt cultivation exceeded threefold (~1,700 kg/ha). The reason examiners reward knowing: India plants Bt in hybrids (for seed-industry economics), which express the toxin unevenly and force farmers into fresh seed annually — China’s true-breeding varieties express fully and can be saved. The pink bollworm’s resistance emergence (2015 onward in Gujarat-and-Maharashtra) traces to refugia non-compliance this hybrid system encourages. The perverse output: the technology succeeded while its institutional design capped the success — the sharpest single sentence available for any GM-policy answer.

The Mustard File: What DMH-11 Actually Is (For the Argument’s Sake)

The barnase-barstar system’s purpose is hybrid seed production in a self-pollinating crop: barnase causes male sterility in one line, barstar restores fertility in the cross — the hybrid seed that results carries heterosis (hybrid vigour worth 20-30% yield in trials). The glufosinate-tolerance gene (bar) rides along for seed-production marking, not field spraying — the herbicide-tolerance framing that dominated the public debate was largely a category error, and saying so precisely (with the hybrid-not-HT logic) marks an answer as technically informed. The Supreme Court’s July 2024 verdict upheld the approval process while directing stronger post-release monitoring — and the deeper fact for mains: environmental release has been approved since 2022, yet farmer cultivation has not begun, because seed multiplication and state-level acceptance remain pending. The gap between regulatory approval and actual adoption is itself the story.

Gene Editing: The 2022 Exemption and Its Consequences

The environment ministry’s 2022 guidance exempted SDN-1 and SDN-2 gene-edited plants (no foreign gene inserted) from GM-rules oversight — treating them as conventional breeding products, aligned with Japan, the US and several others. The consequence: Indian research shifted decisively toward editing (drought-tolerant rice, low-phytate wheat, disease-resistant banana programs), where approvals are faster and public resistance lower, while transgenic mustard-and-brinjal remain politically frozen. The mains verdict line: India regulates the process (how the trait was made) rather than the product (what trait results) — a framework the academies have criticised, and the single best critique-sentence available on this topic.