Rice roots dial down a growth signal to survive drought
Shim Y, Rim EY, Liao JC, Cho MJ, Austin G
Plant Signaling
If you've ever watched a plant seem to pause growth and toughen up during a dry spell, this is the molecular reason why, and it hints at future rice varieties bred to make that switch happen faster or more efficiently.
Rice roots make a small signaling peptide called OsPSY8 that tells the plant to keep growing, especially in side roots. When the soil gets too dry or salty, a stress-response protein shuts down that signal so the plant can stop investing in growth and start defending itself, building tougher cell walls and stockpiling protective compounds. Researchers showed that rice plants missing this peptide handled stress better, while plants with extra copies of it struggled more, revealing a built-in trade-off switch between growing and surviving.
Key Findings
OsPSY8 peptide is expressed mainly in rice roots under normal conditions and promotes lateral root growth
Osmotic stress rapidly suppresses OsPSY8 expression via the OsWRKY24 transcription factor
Loss-of-function ospsy8 mutants showed enhanced osmotic stress tolerance with increased lignin accumulation, while OsPSY8 overexpression increased stress susceptibility by maintaining growth programs
chevron_right Technical Summary
Scientists found a molecular 'growth switch' in rice roots that gets turned down during drought-like stress, allowing the plant to shift resources from growing roots to surviving dry conditions. Dialing this switch up or down in the lab directly changed how well rice handled osmotic stress, pointing to a new target for breeding tougher crops.
Abstract Preview
Original paper
Signaling by a tyrosine-sulfated peptide balances growth and osmotic stress response in rice.
Peptide hormone signaling coordinates plant growth and osmotic stress responses, yet how the transition between these responses is regulated remains poorly understood. Here, we investigated the fun...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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