Metabolic and Gene Expression Profile Reveal Genetic Basis of Reproductive Stage Drought Tolerance in a Drought-Defying Rice Mutant.

A gamma-ray-induced rice mutant exhibits a threefold yield advantage under drought, revealing key genetic and metabolic mechanisms of drought tolerance.

• Why it matters: Understanding how rice sustains productivity during water scarcity is crucial for food security, yet the genetic basis of drought resilience remains largely unknown.
• What they did: Researchers screened a mutagenized rice population across multiple generations and environments, identifying a mutant with enhanced drought tolerance and analyzing its physiological, metabolomic, and gene expression profiles.
• The result: The mutant's drought tolerance is linked to upregulated stress pathways and a major gene, OsAKR, which improves detoxification of harmful compounds, offering a valuable resource for breeding resilient rice varieties.