India’s gene-edited rice is ready for the fields: What you need to know
Pusa DST Rice 1, a genome-edited rice variety developed by ICAR-IARI (Indian Agricultural Research Institute), New Delhi, is set to enter seed multiplication and move toward commercial cultivation from the upcoming rabi season.
The variety was developed from the popular MTU 1010 rice background by editing (knocking out) a gene that suppresses drought and salt-stress tolerance, without inserting any foreign DNA.
Field data indicate yield gains ranging from roughly 9.7% to over 30% in saline and alkaline soils, alongside improved tillering and reduced water use through lower stomatal density.
ICAR is finalising a technology-partnership arrangement to support seed multiplication and wider commercial rollout of the variety.
Pusa DST Rice 1 and DRR Dhan 100 (Kamala) were announced together as India's first genome-edited crop varieties.
Genome Editing vs GMOs — SDN1/SDN2/SDN3 Classification
Genome editing uses site-directed nuclease (SDN) technologies (such as CRISPR-Cas9) to make precise, targeted changes to a plant's own DNA. It is classified into three categories based on the nature of the edit, and this classification determines the regulatory pathway a crop must follow in India.
Key Details
- SDN1: creates small, targeted mutations (insertions/deletions) without inserting any external DNA template.
- SDN2: uses a short DNA template to guide a very specific, small sequence change, also without retaining foreign DNA.
- SDN3: involves insertion of a foreign gene/DNA sequence, and is treated on par with a Genetically Modified Organism (GMO).
- Pusa DST Rice 1 falls under SDN1/SDN2 (gene "knockout" with no foreign DNA retained), which is why it escapes GMO-style regulation.
Because Pusa DST Rice 1 involves only a gene knockout with no foreign DNA, it qualifies for India's lighter genome-editing regulatory track rather than the stricter GMO approval process — explaining why it can move to seed multiplication faster than a transgenic crop like Bt cotton or GM mustard.
India's Genome-Editing Regulatory Exemption (2022)
In March 2022, the Ministry of Environment, Forest and Climate Change (MoEFCC) issued an Office Memorandum exempting SDN1 and SDN2 genome-edited plants that are free of exogenous (foreign) DNA from Rules 7–11 of the Rules for Manufacture, Use, Import, Export and Storage of Hazardous Microorganisms/Genetically Engineered Organisms or Cells, 1989 (framed under the Environment (Protection) Act, 1986).
Key Details
- The exemption removes the requirement for biosafety clearance from the Genetic Engineering Appraisal Committee (GEAC), the apex GMO regulator in India.
- Regulatory jurisdiction for such SDN1/SDN2 crops shifts instead to the Seeds Act framework, with an Institutional Biosafety Committee certifying the absence of foreign DNA.
- SDN3 products, involving foreign gene insertion, continue to require full GEAC biosafety assessment as GMOs.
- This regulatory distinction is why genome-edited rice can reach farmers' fields years faster than a comparable transgenic variety, which typically faces prolonged field-trial and approval delays (as seen with Bt brinjal and GM mustard).
Pusa DST Rice 1's fast-tracked path to commercial seed multiplication is a direct outcome of the 2022 exemption — it is being treated as a conventionally-bred-equivalent variety rather than a GMO requiring GEAC clearance.
Abiotic Stress Tolerance in Agriculture: Drought and Salinity
Drought and soil salinity are major abiotic stresses limiting crop yield in India, especially in coastal, arid, and canal-irrigated regions prone to waterlogging and salt accumulation. Breeding or editing for stress-tolerance genes (as in Pusa DST Rice 1) is a key strategy under India's climate-resilient agriculture push.
Key Details
- Reduced stomatal density lowers water loss through transpiration, improving water-use efficiency under drought.
- Salinity tolerance is critical for rice grown in coastal Kerala, West Bengal's Sundarbans fringe, and canal-irrigated tracts affected by secondary salinization.
- ICAR's genome-edited rice programme sits alongside conventional stress-tolerant varieties released earlier (e.g., Swarna-Sub1 for flood tolerance, CSR series for salinity), showing a shift from conventional breeding to precision gene-editing tools.
The claimed 9.7–30%+ yield gains in saline/alkaline soils position Pusa DST Rice 1 as a tool for expanding rice cultivation into marginal, stress-affected lands without expanding freshwater or fertile-land use.
- Developing institute: ICAR-IARI (Indian Agricultural Research Institute), New Delhi
- Parent variety: MTU 1010
- Yield gain claimed: approximately 9.66% to 30.4% in saline/alkaline soils
- Regulatory exemption: MoEFCC Office Memorandum, March 2022, for SDN1/SDN2 genome-edited plants
- Regulator bypassed: Genetic Engineering Appraisal Committee (GEAC) — applicable only to SDN3/GMOs
- Companion variety announced alongside: DRR Dhan 100 (Kamala)
- Target season for seed multiplication: upcoming rabi season, 2026