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- W2063031605 abstract "Minor veins and contiguous tissues of the Spinacia oleracea leaf were analyzed by electron microscopy to determine the characteristics of the component cells and the structure, distribution, and frequency of plasmodesmata between the various cell types of the leaf. Mesophyll and bundle‐sheath cells contain components typical of photosynthetic cells although the latter cell type contains smaller chloroplasts and fewer mitochondria and microbodies than the mesophyll cells. In addition, the mesophyll cells contain numerous invaginations of the plasmalemma bordering the chloroplasts and evaginations of the outer membrane of the opposing chloroplast envelope. In places, these membranes appear continuous with each other. The minor veins consist of tracheary elements, xylem parenchyma cells, sieve‐tube members, companion and phloem parenchyma cells, and other cells simply designated vascular parenchyma cells. The companion and phloem parenchyma cells are typically larger than the sieve‐tube members with the companion cells containing a much denser cytoplasm that the phloem parenchyma. Cytoplasmic connections occur along all possible routes from the mesophyll to the sieve‐tube members and consist of either simple or branched plasmodesmata between parenchymatic elements or pore‐plasmodesmata between the sieve‐tube members and parenchyma cells. The highest frequency of plasmodesmata occurs between the sieve‐tube members and companion cells, although the value is essentially the same as between the various parenchymatic elements of the phloem. Compared to several previously studied species, the frequency of plasmodesmata between cell types of the spinach leaf is low. These results are discussed in relation to apoplastic vs. symplastic solute transport and sieve‐tube loading in this species." @default.
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- W2063031605 date "1990-10-01" @default.
- W2063031605 modified "2023-10-16" @default.
- W2063031605 title "LEAF OF SPINACIA OLERACEA (SPINACH): ULTRASTRUCTURE, AND PLASMODESMATAL DISTRIBUTION AND FREQUENCY, IN RELATION TO SIEVE-TUBE LOADING" @default.
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- W2063031605 doi "https://doi.org/10.1002/j.1537-2197.1990.tb11388.x" @default.
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