phragmosomen.
/ˈfraɡməsəʊm/, U.S. /ˈfræɡməˌsoʊm/ Botany.
A layer of darker cytoplasm which forms during mitosis in some plant cells at the site of the future cell plate. Also: any of the large number of small particles that form this layer.
ΘΚΠ
the world > plants > part of plant > cell or aggregate tissue > [noun] > cell > parts of cell > other parts
disc1835
crystalloid1863
autoplast1884
plastid1885
granum1894
primary endosperm nucleus1897
chromoplast1902
phragmoplast1904
plasmodesma1905
phragmosome1940
1940 E. W. Sinnott & R. Bloch in Proc. National Acad. Sci. U.S.A. 26 226 This cytoplasm..tends to become aggregated into a series of strands..which occupies the position of the future wall and which thus indicates..where the plane of the division is to be. For this plate of cytoplasm the writers propose the term phragmosome.
1960 Proc. 4th Internat. Conf. Electron Microscopy 505 Other structures of the cytoplasm are consistently associated with the plate... The more obvious of these bodies (phragmosomes) tend to be a uniform distance from the cell plate.
1965 A. Frey-Wyssling & K. Mühlethaler Ultrastruct. Plant Cytol. 279 During and after the formation of the cell plate osmiophilic particles become evident in the phragmoplast, which can reach light microscopic dimensions and which are known as phragmosomes.
1971 Canad. Jrnl. Bot. 49 927 RNA was concentrated in phragmosomes and at the newly formed cell plates.
1991 Bot. Gaz. 152 406/2 The phragmosome provides a medium in which the later-appearing phragmoplast microtubules carry out the assembly of dictyosome vesicles containing the precursory cell-wall material for the new cell wall.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1940