pleromen.

Brit.

/ˈplɪərəʊm/, U.S.

/ˈplɪˌroʊm/

Origin: A borrowing from German. Etymon: German Plerom.

Etymology: < German Plerom (1873 in the source translated in quot. 1875 at main sense; earlier as †Pleroma (J. Hanstein 1868, in Abhandl. der Naturwissensch. als Gratulationsschr. der Niederrhein. Ges. f. Natur- u. Heilkunde 120)) < ancient Greek πλήρωμα a thing which fills (see pleroma n.): compare -ome comb. form.In plerome-cylinder at Compounds after German Pleromstrang (1874 in the passage translated in quot. 1882¹ at Compounds).

Botany.

The innermost layer of an apical meristem, which gives rise to the central vascular tissue and pith.

ΘΚΠ

the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > meristem

meristem1872

plerome1875

protomeristem1880

calyptrogen1881

perimeristem1884

pleroma1890

promeristem1898

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 127 If no pith is formed, as in many roots and some shoots.., the whole of the plerome [Ger. Plerom] is developed into procambium.

1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 7 As Hanstein has shown, the young embryo of the Angiospermous Phanerogams separates, while still consisting of few cells,..into three layers, or groups of cells, which differ in their arrangement and direction of division; these were termed by their discoverer, Dermatogen, Periblem, and Plerome.

1900 Bot. Gaz. 30 39 Only the epidermis was differentiated, while the plerome is scarcely distinguishable.

1965 K. Esau Plant Anat. (ed. 2) v. 117 The young root is more or less clearly separated into the future central cylinder (plerome) and cortex (periblem).

1996 Amer. Jrnl. Bot. 83 34 The plerome is composed of tissue-specific initials for the xylem, phloem and pericycle.

Compounds

General attributive, as plerome-cylinder, plerome-sheath, plerome tip.

ΚΠ

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 166 The origin of lateral roots in a mother-root is always on the outside of its axial fibrovascular or plerome-cylinder [Ger. Pleromstrang].

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 167 These mother-cells of the lateral roots lie in the plerome-sheath.

1918 Bot. Gaz. 66 188 In Pinus and Picea the plerome tip of the root is set off about 0.15 mm. from the apex of the cylindrical mass of cells.

1953 New Phytologist 52 54 The apex of a root..may have a normally differentiated plerome cylinder.

1983 New Phytologist 95 682 Unvacuolate cells..became increasingly few, until finally restricted to a small region at the plerome tip.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	plerome
释义	pleromen. Brit. /ˈplɪərəʊm/, U.S. /ˈplɪˌroʊm/ Origin: A borrowing from German. Etymon: German Plerom. Etymology: < German Plerom (1873 in the source translated in quot. 1875 at main sense; earlier as †Pleroma (J. Hanstein 1868, in Abhandl. der Naturwissensch. als Gratulationsschr. der Niederrhein. Ges. f. Natur- u. Heilkunde 120)) < ancient Greek πλήρωμα a thing which fills (see pleroma n.): compare -ome comb. form.In plerome-cylinder at Compounds after German Pleromstrang (1874 in the passage translated in quot. 1882¹ at Compounds). Botany. The innermost layer of an apical meristem, which gives rise to the central vascular tissue and pith. ΘΚΠ the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > meristem meristem1872 plerome1875 protomeristem1880 calyptrogen1881 perimeristem1884 pleroma1890 promeristem1898 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 127 If no pith is formed, as in many roots and some shoots.., the whole of the plerome [Ger. Plerom] is developed into procambium. 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 7 As Hanstein has shown, the young embryo of the Angiospermous Phanerogams separates, while still consisting of few cells,..into three layers, or groups of cells, which differ in their arrangement and direction of division; these were termed by their discoverer, Dermatogen, Periblem, and Plerome. 1900 Bot. Gaz. 30 39 Only the epidermis was differentiated, while the plerome is scarcely distinguishable. 1965 K. Esau Plant Anat. (ed. 2) v. 117 The young root is more or less clearly separated into the future central cylinder (plerome) and cortex (periblem). 1996 Amer. Jrnl. Bot. 83 34 The plerome is composed of tissue-specific initials for the xylem, phloem and pericycle. Compounds General attributive, as plerome-cylinder, plerome-sheath, plerome tip. ΚΠ 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 166 The origin of lateral roots in a mother-root is always on the outside of its axial fibrovascular or plerome-cylinder [Ger. Pleromstrang]. 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 167 These mother-cells of the lateral roots lie in the plerome-sheath. 1918 Bot. Gaz. 66 188 In Pinus and Picea the plerome tip of the root is set off about 0.15 mm. from the apex of the cylindrical mass of cells. 1953 New Phytologist 52 54 The apex of a root..may have a normally differentiated plerome cylinder. 1983 New Phytologist 95 682 Unvacuolate cells..became increasingly few, until finally restricted to a small region at the plerome tip. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1875
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