| 释义 |
leptome Bot.|ˈlɛptəʊm|
Also leptom.
[ad. G. leptom (G. Haberlandt Physiologische Pflanzenanatomie (1884) vii. 229), f. Gr. λεπτ-ός thin + -ome.]
(See quot. 1965.) So leptoˈcentric a., having the leptome surrounded by hadrome.
1898H. C. Porter tr. Strasburger's Text-bk. Bot. 102 The vascular portion is also termed the xylem or hadrome, and the sieve-tube portion the phloem or leptome. 1902Encycl. Brit. XXV. 409/1 The tissue developed to meet the demands for conduction..is known as leptom. 1914M. Drummond tr. Haberlandt's Physiol. Plant Anat. vii. 347 The protein-conducting elements..form..the delicate leptome portion..of the strand... If the leptome has no fibrous sheath, it of course becomes synonymous with phloem. Ibid. 349 If the hadrome is central and the leptome peripheral, the bundle may be termed hadrocentric... The opposite or leptocentric..condition is exemplified by the leaf-trace bundles in many monocotyledonous rhizomes. 1940Chambers's Techn. Dict. 495/2 Leptocentric vascular bundle, a concentric vascular bundle, in which a central strand of phloem is surrounded by xylem. 1965K. Esau Plant Anat. (ed. 2) xii. 272 The term leptom deserves special mention. It refers..to the soft-walled conducting part of the phloem. |