Late-formed metaphloem sieve-elements in Zea mays L.
Late-formed metaphloem sieve-elements in the vascular bundles of the leaf and pedicels of Zea differ from the typical sieve elements by having thicker cell walls and larger, elongate plastids. The plastids contain a quasi-crystalline structure which is different from that observed in the spherical plastids of sieve elements of other monocotyledons.
Department of Biology, University of Pittsburgh, 15260, Pittsburgh, Pennsylvania, USA.
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Walsh