Plants dial down a growth signal to survive heat waves
Xu M, Wu H, Liu CW, Zhao Z
Plant Signaling
The tiny cluster of stem cells at every shoot tip, the one that makes all new leaves and flowers possible, has its own built-in thermostat that shuts down growth signals when things get too hot to protect itself from permanent damage.
At the very tip of every plant shoot sits a tiny group of stem cells that keeps producing new leaves, stems, and flowers throughout the plant's life. Researchers found that two genes, CLV3 and WUS, work together in a feedback loop that normally keeps these cells active, but during heat stress the plant deliberately dampens this loop to protect the stem cells from damage. It's a built-in survival trick that helps the plant's growth engine ride out a heat wave instead of burning out.
Key Findings
CLV1 phosphorylates the transcription factor BZR1, releasing its inhibition of cytokinin biosynthesis and maintaining WUS expression levels in individual stem cells
CLV signaling has a dual effect on WUS: it restricts the size of the WUS expression domain while sustaining WUS expression levels within that domain
Under heat stress, reduced CLV signaling stabilizes BZR1 in the nucleus, suppressing cytokinin biosynthesis and lowering WUS levels to protect shoot stem cells from heat shock
chevron_right Technical Summary
Scientists discovered how plant stem cells protect themselves during heat waves by fine-tuning a molecular feedback loop between two key genes. This helps explain how plants might maintain growth centers even as temperatures rise.
Abstract Preview
Original paper
A CLV3-WUS positive feedback loop in individual cells enhances shoot stem cell thermotolerance in Arabidopsis.
CLAVATA3 (CLV3) has long been thought to be a negative regulator of the WUSCHEL (WUS) expression domain, whereas cytokinin signaling increases WUS expression at the transcriptional level. Whether t...
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