Natural variation in Arabidopsis uncouples leaf and flower development and reveals massive transcriptomic heterochrony.
Dieudonné S, Kristianingsih R, Hallet S, Jesson B, Vidal V
Plant Development
PubMedBreeders working on crops like canola, broccoli, or fruit trees could use this discovery to independently control when a plant leafs out versus when it flowers, potentially extending harvest windows or improving yield without sacrificing fruit production.
Most plants stop growing new leaves the moment they start making flowers, but some individuals naturally keep doing both at once. Researchers found that this unusual behavior isn't caused by the usual 'flowering switch' genes — it's caused by a widespread scrambling of when hundreds of other genes turn on and off, almost like the plant's internal clock gets out of sync. This suggests that the timing of gene activity, not just which genes are active, is a major driver of how plants look and behave.
Key Findings
The continued production of leaves (bracts) after flower initiation is controlled by at least four previously unknown genetic loci, none of which are the classic floral identity genes.
Time-series gene expression analysis revealed a massive desynchronization of gene activity dynamics — affecting far more biological processes than just leaf identity — when bracts persist.
The findings support and extend the 'inverse hourglass' model, suggesting that transcriptomic timing divergence drives morphological variation not just between species, but within a single species.
chevron_right Technical Summary
Scientists discovered that some Arabidopsis plants naturally keep growing small leaves even after they start making flowers — two processes that are normally tightly linked. This uncoupling is controlled by novel genetic regulators and is driven by a massive shift in the timing of thousands of genes switching on and off.
Abstract Preview
Plant development is a sequence of precisely timed and spatially coordinated events that produce organs such as leaves and flowers. In Arabidopsis thaliana, for example, the development of leaves (...
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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.