FUNCTIONAL STUDIES ON SIEVE ELEMENT-SPECIFIC PROTEINS
Plant Signaling
Every tomato you've ever grown fattened because sugars moved invisibly from leaves to fruit through microscopic tubes — and we're only now learning what proteins keep that pipeline running under drought and salt stress.
Plants have a highway system inside them that moves sugars and nutrients from leaves (where they're made) to roots, fruits, and seeds (where they're needed). The cells that form this highway are unusual — they hollow themselves out to let things flow freely. This research found new proteins inside those cells, and when scientists removed two of them, plants grew more slowly and struggled with salty soil; when plants had extra copies, they grew taller and produced heavier seeds.
Key Findings
Two novel proteins (PHLO-1 and PHLO-2) were found in phloem plastids; knockout plants showed delayed germination and increased salt sensitivity, while overexpressing plants grew taller with heavier seeds.
Two proteins were identified in a previously uncharacterized region of the endoplasmic reticulum in phloem cells, suggesting the endomembrane system inside these cells is more compartmentalized by size than previously known.
45 candidate proteins were significantly upregulated in phloem cells after 5 weeks of aphid feeding, providing a molecular-level picture of how plants respond to long-term sap-sucking pest infestation.
chevron_right Technical Summary
Scientists discovered new proteins inside the specialized plant cells that transport sugars through stems and leaves. Two of these proteins appear to play a role in stress responses and growth, opening a window into how plants regulate their internal supply chains.
Abstract Preview
Phloem is the tissue that transports photoassimilates and macromolecules from source tissues to sink tissue. The cell responsible for all the transport is the sieve element; in its mature state, it...
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