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ASPECTS OF SIEVE ELEMENT ULTRASTRUCTURE IN PRIMULA OBCONICA

Stanley R. Tamulevich and Ray F. Evert
Planta
69. Bd., 4. H. (1966), pp. 319-337
Published by: Springer
Stable URL: http://www.jstor.org/stable/23366050
Page Count: 19
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ASPECTS OF SIEVE ELEMENT ULTRASTRUCTURE IN PRIMULA OBCONICA
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Abstract

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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