P-Protein in sieve elements

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1973 English Publisher:Springer Science and Business Media LLCJournal:Planta, volume 109, pages 127-133 (issn: 0032-0935, eissn: 1432-2048,

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Authors: D D, Sabnis; J W, Hart;

doi: 10.1007/bf00386120

pmid: 24474058

P-Protein in sieve elements

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Abstract

The ultrastructure of P1 and P2 proteins in the sieve elements of Heracleum mantegazzianum is described. P1-protein tubules are closely associated with stacks of membranes, are often linked by short cross-bridges, and occasionally display a hexagonal packing. Incubation with the alkaloids vinblastine and colchicine had no discernible effects on the ultrastructure of the sieve elements at various stages during differentiation. Evidence for and against any similarities between P1-protein tubules and cytoplasmic microtubules is discussed.

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University of Aberdeen
United Kingdom

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