Guard cell-enriched phosphoproteome reveals phosphorylation of endomembrane proteins in closed stomata.
Pullen AM, Lyons SP, Mordant AL, Herring LE, Akpa BS
Plant Signaling
Every time your garden wilts on a hot afternoon and then perks back up at dusk, guard cells are making split-second decisions about water — and this research reveals an overlooked control system inside those cells that could one day help breeders grow crops that stay hydrated longer with less irrigation.
Plants breathe through microscopic pores called stomata, each flanked by two sausage-shaped guard cells that swell or shrink to open or close the pore. Scientists discovered that when the pore is shut tight, a whole suite of proteins involved in moving cargo around inside the guard cell gets chemically tagged and activated. This suggests that an internal 'postal sorting' system inside guard cells plays a bigger role in controlling how plants manage water than anyone previously realized.
Key Findings
Guard cells with closed stomata showed significantly higher phosphorylation (chemical activation) of proteins linked to endomembrane trafficking and vacuoles compared to both open stomata and whole leaf tissue.
The study generated a deep proteome profile of guard cell-enriched tissue that closely matched previously characterized guard cell protein inventories, validating the experimental approach.
The findings support a new hypothesis that phosphorylation of internal membrane-trafficking proteins is a key regulatory mechanism for stomatal movement, a pathway not previously well characterized.
chevron_right Technical Summary
Scientists mapped which proteins get chemically 'switched on' inside the tiny cells that open and close leaf pores (stomata). They found that when stomata are closed, proteins involved in internal cell-membrane traffic are unusually active, suggesting this membrane-sorting machinery helps regulate how tightly plants seal themselves against water loss.
Abstract Preview
Control of the stomatal aperture is multifaceted, involving a complex interplay of environmental cues and intracellular signaling pathways. It is well established that changes in ion gradients driv...
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