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Aspects of sieve element ultrastructure in Primula obconica

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At maturity, the enucleate sieve element of Primula obconica is lined with a parietal layer of cytoplasm consisting of plasmalemma, one or more cisterna-like layers of endoplasmic reticulum, numerous mitochondria and plastids, and a membrane which apparently separates these cytoplasmic components from a large central cavity. The central cavity contains numerous longitudinally oriented slime tubules. We believe these tubules normally form strands which run the length of the cell and traverse consecutive cells through the sieve-plate pores. Developmental aspects are discussed.

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This research has been supported by NSF Grant GB 3193.

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Tamulevich, S.R., Evert, R.F. Aspects of sieve element ultrastructure in Primula obconica . Planta 69, 319–337 (1966). https://doi.org/10.1007/BF00392283

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  • Endoplasmic Reticulum
  • Central Cavity
  • Sieve Element
  • Developmental Aspect
  • Cytoplasmic Component