For
Online Viewing (1.6 Mb)
25. Brown, Jr. R. M. and C. Van Baalen.
1970. Comparative ultrastructure of a filamentous mutant and the
wild type of Agmenellum quadruplicatum. Protoplasma 70:87-99.
25. Summary
A filamentous variant of the marine coccoid
cyanophycean alga, Agmenellum quadruplicatum has
been produced after treatment of cells with the chemical mutagen,
N-methyl-N'-nitro-N-nitrosoguanidine (NTG). The mutation to the
filamentous condition is stable and has been compared ultrastructurally
with the unicellular wild type. The structural basis for the
maintenance of the filamentous state is due to a failure of the
homogeneously-structured transverse wall to differentiate into
the stratified longitudinal wall. A manifestation of this condition
is the continued synthesis of the investment membrane resulting
in proliferations at each constriction. The wild type cells are
nearly spherical while the filamentous mutant cells are smaller
and elongate. An analysis of the structure and morphology of
the nucleoplasmic regions is presented for both strains and a
correlation between the morphology of these regions and the unicellular
and filamentous conditions is made.
Up to the 1970 Publications Page
Up to Malcolm Brown's Lab Page
Last modified 27 October 2005.
This document is maintained by Dr. R. Malcolm Brown, Jr.