Revision summary
SDN-1 genome editing changes the plant’s own genes without a foreign gene insert. ICAR used this on Samba Mahsuri and MTU1010 rice. In May 2024 India released DRR Dhan 100 (Kamala) and Pusa DST Rice 1 from that work. The 2022 MoEFCC note keeps such SDN-1 products outside the old GM rules; GEAC still handles transgenics. Climate gain is drought and salt tolerance plus shorter duration, if seed systems deliver.
Model answer
Introduction
Genome editing lets breeders change a plant’s own DNA without inserting a foreign gene in the SDN-1 path. In 2024 India publicly showed this on rice, which is the staple most exposed to drought and salt.
Body
What changed in 2024–2025
- ICAR institutes used CRISPR-based SDN-1 editing on two widely grown rice types: Samba Mahsuri (BPT 5204) and MTU1010.
- In May 2024 the Union Agriculture Minister released two genome-edited rice lines from that work: DRR Dhan 100 (Kamala), from Samba Mahsuri, aimed at drought tolerance, earlier harvest, and higher yield in trials; and Pusa DST Rice 1, from MTU1010, aimed at drought and salinity.
- These are not transgenic GM crops; SDN-1 products without foreign DNA were placed outside the 1989 GM rules by a 2022 MoEFCC office memorandum, while GEAC still regulates transgenic events.
Productivity and resilience
- Shorter duration and stress tolerance are climate tools: they save irrigation days and protect yield when the monsoon slips.
- CRISPR research in ICAR-IIRR, ICAR-IARI, and other labs continues on yield, disease, and abiotic stress; field release still needs seed systems and state trials.
- Public trust depends on calling these lines by their real names and not mixing them with Bt or other transgenic files.
Flow diagram
flowchart TD C[CRISPR SDN1] --> S[Samba Mahsuri] C --> M[MTU1010] S --> K[DRR Dhan 100 Kamala] M --> P[Pusa DST Rice 1] K --> R[Drought yield duration] P --> R G[GEAC transgenic track] --> X[Separate GM path]
Conclusion
Genome editing is reshaping the rice file through real SDN-1 lines on Samba Mahsuri and MTU1010 backgrounds. Climate resilience will follow only if seed reaches farmers and GEAC’s transgenic track stays distinct.
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Are Kamala and Pusa DST Rice 1 Bt rice?
No. They are SDN-1 genome-edited lines on Samba Mahsuri and MTU1010. They are not foreign-gene Bt events.
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Does GEAC approve all genome-edited plants?
Transgenic GM still goes through GEAC. SDN-1 without foreign DNA follows the 2022 exemption path, not the old GM dossier.
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