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Temperature gradients assist carbohydrate allocation within trees.

Or Sperling1, Lucas C R Silva2, Aude Tixier3

  • 1Institute of Plant Sciences, Agricultural Research Organization, Gilat, 85280, Negev, Israel. orsp@agri.gov.il.

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|June 14, 2017
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Summary
This summary is machine-generated.

Temperature gradients help trees move carbohydrates from roots to canopy in spring, aiding growth. This process changes in fall, impacting tree physiology and potentially climate change adaptation.

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Area of Science:

  • Plant Physiology
  • Tree Biology
  • Environmental Science

Background:

  • Trees face distinct air and soil temperatures, creating internal temperature gradients.
  • These gradients influence crucial processes like carbon metabolism and water transport.

Purpose of the Study:

  • To investigate if temperature gradients facilitate carbohydrate allocation within trees.
  • To understand the role of temperature in sugar transport and storage in pistachio (Pistacia integerrima).

Main Methods:

  • Examined temperature-induced sugar concentration changes in excised pistachio branches.
  • Assessed carbon allocation shifts in young trees under simulated spring and fall conditions.
  • Monitored seasonal starch levels in mature pistachio trees under field conditions.

Main Results:

  • Warmer branches showed lower xylem sugar concentration due to increased parenchyma storage.
  • Simulated spring conditions enhanced carbohydrate movement from cooler roots to warmer canopies.
  • Carbohydrate redistribution became compartmentalized in fall when canopies were cooler than roots.

Conclusions:

  • Temperature gradients play a key role in directing carbohydrate allocation, particularly in spring.
  • A new model of temperature-assisted carbohydrate allocation links environmental cues to tree phenology.
  • Climatic changes may disrupt these thermal "fine-tuning" mechanisms, affecting tree physiological performance.