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Related Experiment Videos

Alterations in source-sink patterns by modifications of source strength.

C Borchers-Zampini1, A B Glamm, J Hoddinott

  • 1Department of Botany, Ohio State University, Columbus, Ohio 43210.

Plant Physiology
|June 1, 1980
PubMed
Summary

Plant leaves adjust how they share nutrients based on source strength. Increasing or decreasing a neighboring leaf's photosynthesis alters assimilate allocation, demonstrating dynamic resource partitioning in plants.

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Area of Science:

  • Plant Physiology
  • Plant Molecular and Cellular Biology
  • Biochemistry

Background:

  • Plant transport systems involve complex source-sink relationships for assimilate allocation.
  • Understanding how source strength influences translocation dynamics is crucial for plant productivity.

Purpose of the Study:

  • To investigate the impact of altered source leaf strength on assimilate partitioning in bean plants.
  • To quantify changes in the allocation ratio of translocated assimilates to near and far leaflet sinks.

Main Methods:

  • Utilized a simplified "double source, double sink" translocation system in bean plants.
  • Manipulated the source strength of a "control" primary leaf while monitoring translocation from a labeled primary leaf.
  • Assessed changes in assimilate allocation ratios to leaflet sinks under varying source strengths (photosynthesis rates, excision, darkening).

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Main Results:

  • When source strengths were similar, assimilates favored the near leaflet sink (ratio 5:1 or higher).
  • Increasing control leaf photosynthesis did not affect translocation from the labeled leaf.
  • Excising the control leaf doubled translocation from the labeled leaf, equalizing partition ratio to unity; darkening caused an intermediate adjustment.

Conclusions:

  • Plant assimilate allocation is sensitive to relative source strengths, with a strong preference for nearby sinks.
  • Translocation rates can rapidly adjust to changes in source-sink dynamics, even when source leaf photosynthesis remains constant.
  • This study elucidates the plasticity of plant transport systems in response to environmental and physiological cues.