Stress hormones and UV light team up to break barley's drought yield barrier
Shoaib N, Liu L, Ahmad I, Mughal N, Bai X
Climate Adaptation
Barley grown under drought stress typically forces farmers to choose between yield and grain quality, but this research points toward a hormonal lever that could eliminate that trade-off in climate-stressed fields.
When barley plants face drought, they usually either survive but produce lighter, less nutritious grains, or push for grain quality at the cost of survival. Scientists discovered that treating plants with a natural stress hormone alongside controlled doses of ultraviolet light flips that script: the plants stayed resilient AND grew heavier, more nutritious seeds. Low UV doses helped the plants remember past stress; higher doses switched the plant back into growth mode.
Key Findings
Combined drought, low UV-B, and abscisic acid treatment increased 1000-seed weight by 10.3% above untreated controls.
Low UV-B with abscisic acid reduced oxidative cell damage by 81.8%, while high UV-B with abscisic acid significantly elevated grain sugar and protein content.
Potassium accumulated in the stem at over 51%, acting as a nutrient buffer that supported grain filling under stress.
chevron_right Technical Summary
Researchers found that combining a plant stress hormone (abscisic acid) with specific doses of UV-B light can help barley plants survive drought without the usual penalty to grain yield or quality. The right pairing actually improved seed weight and nutritional content simultaneously.
Abstract Preview
Original paper
Coordination of Abscisic Acid and Ultraviolet-B Radiations Dissociates Yield and Seed Quality Trade-Offs in Highland Barley under Water Deficit Stress.
Current cereals face unassailable yield trade-offs under combined water deficit (D) and ultraviolet-B (UV-B) stress. Using integrated omics in qingke barley subjected to D, UV-B (low: LUVB; high: H...
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