Super-resolution multimodal spatial transcriptomics reveals an ovoid stem-cell niche structuring de novo shoot regeneration.
Song X, Zhang S, Yue Z, Liu Y, Chen S
Plant Signaling
Every cutting you press into damp soil is racing to rebuild an egg-shaped cellular command center before it dries out — and now scientists can see exactly how that hub assembles itself, opening a path to making notoriously tricky plants root far more reliably.
When a plant is wounded or cut, some cells revert to a blank-slate state and reorganize into a special hub that can grow entirely new shoots. Scientists used super-detailed imaging on tomatoes to watch this process unfold cell by cell and found the hub is shaped like an egg with three distinct zones, each doing a different job. A tiny signaling molecule acts as a messenger between the outer and inner zones, and if that signal breaks down, the whole regeneration process fails.
Key Findings
Approximately 1.2 million individual tomato cells were profiled across the full timeline from wounding through new shoot formation, creating the most detailed spatial atlas of plant regeneration to date.
A previously unrecognized egg-shaped (ovoid) stem-cell niche was discovered, organized into three compartments: an outer signaling layer, a middle 'plastic' zone capable of changing fate, and an inner quiescent core.
The peptide EPFL8b, concentrated in the outer signaling layer, communicates with receptors in the middle zone and is required for proper stem-cell niche organization and successful shoot regeneration.
chevron_right Technical Summary
Scientists mapped 1.2 million individual tomato cells during shoot regeneration and discovered a previously unknown egg-shaped stem-cell hub that directs the process. The hub has three distinct zones — an outer signaling ring, a middle flexible zone, and a quiet inner core — coordinated by a peptide molecule called EPFL8b.
Abstract Preview
Plant de novo regeneration, unlike regeneration in most animal systems, relies on callus formation and re-establishment of stem-cell niches (SCNs) rather than on pre-existing reservoirs. Growth hor...
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The tomato is a plant whose fruit is an edible berry that is eaten as a vegetable. The tomato is a member of the nightshade family that includes tobacco, potato, and chili peppers. It originated from western South America, and may have been domesticated there, in Mexico, or in Central America. Th...