A non-coding SNP in ELF3 alters ELF3β expression and confers adaptation of Arabidopsis to a continental climate.
Buckley CR, Philippova A, Fournier-Level A, Haydon MJ
Climate Adaptation
Thale cress — the tiny white-flowered weed threading through sidewalk cracks — carries clock genes reshaped by ice ages and continental winters, and understanding that retuning reveals exactly how wild plants will (or won't) keep pace with today's accelerating climate shifts.
Plants have internal biological clocks that tell them when to flower, grow, and hunker down for winter — just like our own sleep-wake cycles. Scientists discovered that a nearly invisible change in one of these clock genes helps thale cress thrive in places with extreme seasonal temperature swings. Remarkably, this genetic tweak appears to have spread through plant populations around the time the last ice age ended in Europe, suggesting evolution has already been quietly retuning plant clocks in response to major climate shifts.
Key Findings
A single non-coding DNA change in intron 2 of the ELF3 clock gene alters expression of a shorter protein variant (ELF3β), shifting the plant's circadian period length and enabling adaptation to continental climates with high seasonal temperature variability.
Circadian rhythms measured across 287 global Arabidopsis accessions via genome-wide association study identified multiple ELF3 variants defining three distinct haplogroups, each linked to different patterns of seasonal temperature.
Statistical signatures of a selective sweep in continental-climate haplogroups indicate this adaptation likely spread during Europe's most recent de-glaciation, demonstrating that natural selection has actively targeted a core circadian clock gene in response to climate.
chevron_right Technical Summary
Researchers found that a single tiny genetic change in a key plant clock gene (ELF3) shifts how long Arabidopsis's internal daily rhythm runs, and that plants carrying this variant have thrived in hot, seasonally extreme climates — likely spreading as the last ice age receded from Europe.
Abstract Preview
Plant circadian clocks govern the timing of physiological and developmental processes that determine growth, reproduction, and seasonal phenology. As a result, natural variation in clock genes can ...
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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.