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An unusual feature of developing protophloem sieve elements in roots ofTriticum aestivum L.

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Summary

Developing protophloem sieve elements in roots of wheat are arranged in single vertical files. In the last immature differentiating sieve element bearing ribosomes the proximal end of the cytoplasm displays a diluted appearance in contrast to the distal end where the cytoplasm exhibits a considerably increased electron density. Differences can also be observed in ribosome quantity, organelle ultrastructure and the time of initiation of cell component degradation, those at the proximal end disorganizing first, suggesting a nonsimultaneous disorganization of the cell components in the two areas. This phenomenon, termedheterochronic lysis, is presumably an expression of an existing polarity not detectable in younger stages, but it might also be the result of an asynchronous enzymatic activity.

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Abbreviations

CW:

Cell wall

D:

dictyosome

ER:

endoplasmic reticulum

M:

mitochondrion

N:

nucleus

P:

plastid

SE:

sieve element

SP:

sieve plate

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Authors and Affiliations

  1. Department of Botany, University of Thessaloniki, Thessaloniki

    E. P. Eleftheriou

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  1. E. P. Eleftheriou
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Eleftheriou, E.P. An unusual feature of developing protophloem sieve elements in roots ofTriticum aestivum L.. Protoplasma 152, 14–21 (1989). https://doi.org/10.1007/BF01354235

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  • DOI: https://doi.org/10.1007/BF01354235

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