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THE CELL WALL OF COSMARIUM BOTRYTIS 1 2
Author(s) -
Lott John N. A.,
Harris Graham P.,
Turner Christine D.
Publication year - 1972
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1972.tb04033.x
Subject(s) - cell wall , fibril , materials science , botrytis , biophysics , crystallography , biology , chemistry , botrytis cinerea , botany
SUMMARY The cell wall of Cosmarium botrytis was studied through the use of the freeze‐etch technique. The cell wall consists of many thin layers. Fracturing along one layer reveals the positioning of the wall sculpturing, wall pores, and wall microfibrils. The individual microfibrils are grouped together in bands of parallel oriented fibrils. The different bands of parallel microfibrils were apparently arranged at random angles with regard to each other. Small particles may also be present in the cell walls. The cell wall pore unit of Cosmarium botrytis was studied through the use of scanning, freeze‐etching, and thin sectioning techniques. The pore sheaths, on the outside of the cell wall, form a collar around the mouth of each pore. The pore sheath is composed of needle‐like fibrils radiating outward from the pore. A pore channel traverses the cell wall and leads to a complex pore bulb region between the cell wall and the plasmalemma. The pore bulb contains many small fibrils which radiate toward the plasmalemma from a number of net‐like fibril layers which in turn merge into a very electron dense region near the base of the pore.