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Reverse Sap Flow from Fruit.

Yangfan Chai1, Runqing Zhang2, Qian Wang3

  • 1College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.

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|January 10, 2026
PubMed
Summary
This summary is machine-generated.

Reverse sap flow, the movement of sap from fruit to other plant parts, is triggered by water imbalance from light surges or drought. This fruit sap efflux enhances plant drought resistance, challenging traditional plant science theories.

Keywords:
plant-wearable sensorreverse sap flowsoil-plant-atmosphere continuumsource–sink theorywater balance

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Area of Science:

  • Plant Physiology
  • Plant Water Relations
  • Plant Signaling

Background:

  • Sap flow is vital for transporting water, nutrients, and signals essential for fruit development.
  • Reverse sap flow from fruit to other organs is observed but poorly understood due to limited study methods.

Purpose of the Study:

  • To investigate the mechanisms and triggers of reverse sap flow in watermelon plants.
  • To establish a multimodal data framework for analyzing sap flow dynamics.
  • To challenge the traditional source-sink theory in plant physiology.

Main Methods:

  • Integrated real-time sap flow measurements using novel plant-wearable sensors.
  • Synchronized environmental monitoring to correlate sap flow with external factors.
  • Long-term drought stress experiments to assess plant responses.

Main Results:

  • Identified plant water supply-consumption imbalance as the primary endogenous cause of reverse sap flow.
  • Determined rapid light intensity surges and soil drought as key exogenous triggers.
  • Demonstrated that reverse sap flow enhances plant drought resistance via water redistribution.

Conclusions:

  • Reverse sap flow is a crucial plant response to water imbalance and environmental stress.
  • The findings refine the source-sink paradigm, highlighting the fruit's role beyond a simple sink.
  • This study offers new insights into plant drought tolerance mechanisms.