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Plastids in sieve elements and companion cells of Tilia americana

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Summary

Contrary to an earlier report, the sieve elements and companion cells of Tilia americana contain plastids. In young sieve elements and companion cells the plastids contain a moderately electronopaque matrix and internal membranes; the latter are very numerous in the plastids of the sieve elements. Plastids of mature sieve elements contain an electron-transparent matrix, apparently fewer internal membranes than the plastids of young elements, and a single starch grain each. The plastids of companion cells undergo little or no structural modification during cellular differentiation, and apparently contain no starch.

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References

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Authors and Affiliations

  1. Department of Botany, University of Wisconsin, Madison

    Ray F. Evert & Bharati P. Deshpande

Authors
  1. Ray F. Evert
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  2. Bharati P. Deshpande
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Additional information

This research has been supported by the National Science Foundation, grants GB-5950 and GB-8330.

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Evert, R.F., Deshpande, B.P. Plastids in sieve elements and companion cells of Tilia americana . Planta 96, 97–100 (1971). https://doi.org/10.1007/BF00397909

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  • DOI: https://doi.org/10.1007/BF00397909

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