This rice gene switch helps plants shrug off heat waves
Zhao H, Jiang Y, Ruan B, Zheng W, Chen F
Crop Improvement
Rice feeds more than half the world's population, and as summers get hotter, understanding how some rice plants naturally resist heat stress could keep dinner plates full for billions of people.
Researchers found a protein in rice called OsMYBR17 that acts like an emergency response manager when temperatures spike. When they boosted this protein's activity, rice seedlings handled heat much better, staying greener and healthier, while plants missing the protein wilted and suffered cell damage. The protein works by turning on a second gene that protects cells from heat-related damage, essentially giving the plant a built-in heat shield.
Key Findings
Overexpressing OsMYBR17 significantly improved rice seedling heat tolerance, while CRISPR knockout plants became highly heat-sensitive
OsMYBR17-boosted plants showed lower reactive oxygen species, reduced lipid damage (lower MDA), and higher antioxidant enzyme (APX) activity under heat stress
OsMYBR17 directly binds and activates the OsLEA4 gene promoter, forming a regulatory module that protects chloroplast structure and chlorophyll under prolonged heat exposure
chevron_right Technical Summary
Scientists identified a gene switch in rice that helps plants survive extreme heat by reducing cell damage and keeping their internal machinery intact. This discovery could help breeders create rice varieties better suited to a warming climate.
Abstract Preview
Original paper
OsMYBR17 enhances thermotolerance in rice by activating OsLEA4 and reinforcing antioxidant defense.
Heat stress (HS) severely threatens rice (Oryza sativa) growth, development and yield formation; elucidating regulatory mechanisms underlying rice thermotolerance is essential. Here, we dissected t...
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