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Phloem in carrot calluses.

A D Hanson1, J Edelman

  • 1Queen Elizabeth College, W. 8, London.

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Summary
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Carrot callus cells did not show detectable translocation of carbon-14 labelled photosynthate, even after 6 hours. This suggests a discontinuous phloem structure hinders long-distance transport in these plant tissues.

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Area of Science:

  • Plant Physiology
  • Plant Cell Biology
  • Photosynthesis Research

Background:

  • Phloem transport is crucial for distributing photosynthates throughout plants.
  • Carrot callus cultures are used as model systems to study plant cell behavior.
  • Understanding phloem continuity is key to understanding nutrient allocation.

Purpose of the Study:

  • To investigate the translocation of photosynthates in carrot callus tissues.
  • To assess the functional continuity of the phloem in 2 cm long carrot calluses.
  • To correlate phloem structure with photosynthate transport efficiency.

Main Methods:

  • Carrot calluses were exposed to a 30-minute pulse of carbon-14 labelled carbon dioxide ((14)CO2).
  • Samples were analyzed for the translocation of (14)C-labelled photosynthate up to 6 hours post-pulse.
  • Electron microscopy was used to examine the fine structure of sieve cells and companion cells.

Main Results:

  • No detectable translocation of (14)C-labelled photosynthate was observed across the 2 cm carrot calluses within the 6-hour experimental period.
  • Electron micrographs revealed the presence of small, contiguous strands of well-differentiated sieve cells and companion cells.
  • Despite the presence of differentiated cells, overall phloem continuity for long-distance transport appears limited.

Conclusions:

  • The discontinuous nature of the phloem in carrot calluses likely prevents efficient long-distance translocation of photosynthates.
  • Structural evidence of sieve cells and companion cells does not guarantee functional phloem transport over significant distances in callus tissue.
  • Further research is needed to understand the factors limiting phloem function in vitro.