Age-dependent MADS-box factors recruit PtTFL2 to orchestrate dormancy depth in Pinus tabuliformis.
Qu K, Liu G, Xia Q, Liao T, Guo L
Phenology
Ancient pines in your local park have spent decades — sometimes centuries — learning not to be fooled by a warm February, and now we know the molecular switch that makes their winter sleep so much harder to break than the young trees you might plant this fall.
As pine trees age, they get better at ignoring warm winter days that might trick a young tree into budding too early. Researchers found that older pines produce a set of proteins that gang up together to keep the tree locked in a deeper sleep. This teamwork raises the bar for what it takes to wake the tree up — protecting it from a late frost that could kill tender new buds.
Key Findings
The age-marker protein PtDAL1 is significantly upregulated in dormant buds of 3-year-old saplings compared to juvenile seedlings, establishing a molecular link between tree age and dormancy depth.
PtTFL2 (a dormancy-regulating gene) shows a strict inverse relationship with tree age — its expression declines as trees mature — even though PtDAL1 transcriptionally activates it, revealing a paradox resolved by post-transcriptional protein trapping.
PtDAL1 physically recruits a second protein (PtDAL21) to sequester PtTFL2 into a stable complex, overriding gene expression dynamics and elevating the dormancy-release threshold in adult trees.
chevron_right Technical Summary
Scientists discovered how aging pine trees develop progressively deeper winter dormancy: a trio of proteins forms a stable complex that raises the threshold required for spring awakening, explaining why centuries-old conifers are far more resistant to false-spring temperature spikes than young saplings.
Abstract Preview
The seasonal growth-dormancy cycle constitutes a fundamental survival strategy for perennial woody plants in temperate ecosystems. While this developmental plasticity is orchestrated by environment...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...
Sphinx caligineus, the Chinese pine hawkmoth, is a moth of the family Sphingidae. It is known from Japan, north-eastern, eastern, central and southern China, South Korea, northern Thailand and southern Vietnam.