Sieve Elements pp 103-137 | Cite as


  • Ray F. Evert


The sieve elements of angiosperms are regarded as the most highly evolved among vascular plants, and those of the dicotyledons have received the greatest attention in the literature on phloem. By definition, the sieve elements of dicotyledons are sieve-tube members; that is, sieve elements in which some of the sieve areas are more highly specialized (having larger pores) than others and are localized on the walls to form sieve plates (Esau 1969). Typically, the sieve plates occur on the end walls, and the sieve-tube members are arranged end-on-end to form sieve tubes, the sieve-plate pores providing a high degree of protoplasmic continuity between the superimposed cells (Figs. 6.1–6.3). The protoplasts of dicotyledonous sieve-tube members typically contain P-protein (phloem protein). In addition to the presence of sieve plates and P-protein, the sieve-tube members of dicotyledons typically are associated with companion cells, specialized parenchyma cells closely related to the sieve-tube members both ontogenetically and functionally.


Companion Cell Sieve Tube Sieve Element Minor Vein Wall Ingrowth 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Ray F. Evert

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