Hidden molecular brake fine-tunes how plants grow in the heat
Qin W, Yin Q, Wang N, Pan Y, Meng S
Plant Signaling
The tomatoes and lettuce wilting in your summer garden are doing something far more precise than just stretching toward shade: they're running a finely tuned genetic circuit that, if we can engineer it, could mean crops that stay productive through heat waves instead of bolting or collapsing.
When plants get too warm, they stretch their stems to find cooler, shadier spots. Researchers found a protein called BLH1 that acts like a volume knob on this response, keeping it from going overboard. Two other proteins that normally push the stretching response actually switch BLH1 off when heat hits, which lets the plant respond strongly but then pulls back before the response gets out of control.
Key Findings
BLH1 directly suppresses PIF4 at both the gene and protein level, acting as a dual-layer brake on the heat-elongation response.
Plants overexpressing BLH1 are insensitive to high temperature, while plants lacking BLH1 and its relatives show exaggerated heat responses.
BZR1 directly represses BLH1 expression, forming a negative feedback loop within the BZR1-PIF4-auxin-brassinosteroid circuit that prevents runaway thermomorphogenesis.
chevron_right Technical Summary
Scientists discovered a molecular brake called BLH1 that keeps Arabidopsis plants from overreacting to heat. When temperatures rise, this brake gets released, allowing a known growth-promoting circuit to drive the elongation response plants use to cope with warmth.
Abstract Preview
Original paper
The BZR1-BLH1-PIF4 feedback module acts as a molecular amplifier for precise thermomorphogenesis in Arabidopsis.
Global increases in the intensity and frequency of elevated temperatures is threatening ecosystem stability and crop yield. Understanding plant thermomorphogenesis is critical for developing climat...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Arabidopsis (rockcress) is a genus of small flowering plants in the cabbage and mustard family, Brassicaceae. Arabidopsis species are native to temperate and subarctic Eurasia and North America, North Africa, and the mountains of eastern tropical Africa. This genus is of great interest since it c...