Key Takeaways
- Researchers at Chonnam National University have identified a rice gene called OsFeSOD3 that plays a dual role in protecting plants from drought stress while supporting chloroplast development.
- OsFeSOD3 encodes a chloroplast-localized iron superoxide dismutase — an enzyme that detoxifies reactive oxygen species (ROS) — and also functions as a component of the PEP complex regulating chloroplast biogenesis.
- Rice plants overexpressing OsFeSOD3 showed a 33–42% increase in grain yield under drought conditions compared with wild-type plants, across two years of agronomic trials.
- The findings were published in Volume 24, Issue 4 (2026) of the Plant Biotechnology Journal, with online publication on 17 December 2025.
- The research addresses a long-standing trade-off in crop breeding between stress tolerance and productivity, with OsFeSOD3 offering a potential pathway to achieve both simultaneously.
Chonnam National University Identifies Dual-Function Rice Gene Linking Drought Tolerance and Yield
A research team led by Professor Geupil Jang at Chonnam National University in South Korea has identified a rice gene, OsFeSOD3, that performs two distinct functions: protecting plants from drought-induced cellular damage and regulating the development of chloroplasts, the organelles responsible for photosynthesis. The findings, published in the Plant Biotechnology Journal (Volume 24, Issue 4, 2026), could have significant implications for developing rice varieties that maintain productivity under water stress.
Drought is one of the most significant constraints on global agricultural productivity, and rice — a staple crop feeding roughly half the world's population — is particularly vulnerable to chloroplast disruption under dry conditions. When chloroplast development is impaired, photosynthetic efficiency drops and grain yields fall.
What OsFeSOD3 Does and How the Chonnam National University Research Was Conducted
OsFeSOD3 encodes a chloroplast-localized iron superoxide dismutase, an enzyme that neutralises reactive oxygen species (ROS) — harmful molecules that build up in plant cells under stress. Using time-lapse visualisation of cellular ROS dynamics and genetic analyses, the team found that drought-induced ROS accumulation originates primarily inside chloroplasts before spreading throughout the cell. By increasing OsFeSOD3 expression, the researchers were able to reduce chloroplast ROS levels, limit cellular damage, and improve drought tolerance in rice plants.
Beyond its ROS-scavenging role, the study also found that OsFeSOD3 functions as a component of the PEP complex — a molecular machinery that regulates chloroplast biogenesis in rice. Knock-out mutants of the gene confirmed this second function through phenotypic and molecular characterisation, supported by direct interactions with other PEP-complex proteins.
A 33–42% Yield Gain Under Drought Conditions
The practical significance of the finding was demonstrated through two years of agronomic field trials. Rice plants overexpressing OsFeSOD3 produced 33–42% more grain than wild-type plants under drought conditions, establishing the gene as a promising target for crop improvement programmes focused on climate resilience.
The research addresses one of plant breeding's most persistent challenges: the trade-off between stress tolerance and yield. Crops engineered for stress resistance often sacrifice productivity under normal conditions. OsFeSOD3's dual function — coordinating both ROS metabolism and chloroplast biogenesis — suggests it may offer a route to improving both traits simultaneously, without the usual compromise.
