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OPEN PLASMODESMATA IN SIEVE PLATES OF LAMINARIA DIGITATA
Author(s) -
Van Went J. L.,
Van Aelst A. C.,
Tammes P. M. L.
Publication year - 1973
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1973.tb00821.x
Subject(s) - plasmodesma , callose , botany , biology , ultrastructure , cell wall
SUMMARY After cooling and killing by freezing in solid CO 2 and fixation at –2°C, the white outer ring (probably callose) was found to be absent in electron micrographs of plasmodesmata. Some plasmodesmata were partly or entirely filled with a dark plug, but others were open with a lining of protoplasm. The observation of open plasmodesmata accords with the experimental fluid flow through them described in a previous paper (1972). The plugging mechanism seems similar to that of sieve‐plate pores in higher plants.