Plants sense a growth hormone in seconds, not minutes
Ali K, Li W
Plant Signaling
The way your houseplant bends toward a sunny window or a root swerves around a rock happens faster than gene activity could explain, and this review lays out the actual molecular switch behind that split-second response.
Plants use a hormone called auxin to control almost every aspect of growth, and scientists long assumed it worked mainly by turning genes on inside the cell nucleus, a process that takes time. This review pulls together new evidence for a much faster backup system: a set of proteins sitting on the outside of the cell that detect auxin and trigger immediate changes, like acidifying the space around the cell or reshaping its internal skeleton, all within seconds. Understanding this quick-response system helps explain how plants make snap decisions about which way to grow.
Key Findings
Rapid, non-transcriptional auxin signaling relies on plasma membrane co-receptors ABP1/ABL1/2 paired with TMK family kinases, distinct from the classical nuclear TIR1/AFB pathway
This apoplastic (extracellular) signaling complex triggers global phosphorylation, cell wall acidification, and cytoskeletal remodeling within seconds of auxin exposure
The TMK-ABP1 signaling module shows conserved evolutionary origins across plant species, suggesting it is a deeply rooted mechanism for fast auxin perception
chevron_right Technical Summary
Scientists have mapped a fast-acting signaling system that lets plant cells sense the growth hormone auxin outside the cell and react within seconds, instead of waiting minutes for genes to switch on. This rapid pathway helps explain how plants make quick shape and growth adjustments, like bending toward light or redirecting root growth.
Abstract Preview
Original paper
Beyond the nucleus: The TMK family in auxin signaling.
Auxin, a key plant hormone, regulates growth and development through two distinct receptor systems. The well-established transport inhibitor response 1 (TIR1)/auxin-signaling F-box protein (AFBs) p...
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