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2014 ; 49
(4
): 395-412
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English Wikipedia
Morphology and ultrastructure of Interfilum and Klebsormidium (Klebsormidiales,
Streptophyta) with special reference to cell division and thallus formation
#MMPMID26504365
Mikhailyuk T
; Holzinger A
; Massalski A
; Karsten U
Eur J Phycol
2014[Oct]; 49
(4
): 395-412
PMID26504365
show ga
Representatives of the closely related genera, Interfilum and Klebsormidium, are
characterized by unicells, dyads or packets in Interfilum and contrasting
uniseriate filaments in Klebsormidium. According to the literature, these
distinct thallus forms originate by different types of cell division, sporulation
(cytogony) versus vegetative cell division (cytotomy), but investigations of
their morphology and ultrastructure show a high degree of similarity. Cell walls
of both genera are characterized by triangular spaces between cell walls of
neighbouring cells and the parental wall or central space among the walls of a
cell packet, exfoliations and projections of the parental wall and cap-like and
H-like fragments of the cell wall. In both genera, each cell has its individual
cell wall and it also has part of the common parental wall or its remnants.
Therefore, vegetative cells of Interfilum and Klebsormidium probably divide by
the same type of cell division (sporulation-like). Various strains representing
different species of the two genera are characterized by differences in cell wall
ultrastructure, particularly the level of preservation, rupture or gelatinization
of the parental wall surrounding the daughter cells. The differing morphologies
of representatives of various lineages result from features of the parental wall
during cell separation and detachment. Cell division in three planes (usual in
Interfilum and a rare event in Klebsormidium) takes place in spherical or short
cylindrical cells, with the chloroplast positioned perpendicularly or obliquely
to the filament (dyad) axis. The morphological differences are mainly a
consequence of differing fates of the parental wall after cell division and
detachment. The development of different morphologies within the two genera
mostly depends on characters such as the shape of cells, texture of cell walls,
mechanical interactions between cells and the influence of environmental
conditions.