| 释义 |
protoxylemenUK
protoxylem (ˌprəʊtəˈzaɪləm) n (Botany) the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin. Compare metaxylempro•to•xy•lem (ˌproʊ təˈzaɪ ləm, -lɛm)
n. the part of the primary xylem of a plant that develops first, consisting of narrow, thin-walled cells.
protoxylemenUK
protoxylem[¦prōd·ō′zī·ləm] (botany) The part of the primary xylem that differentiates from the procambium and is formed during elongation of an embryonic plant organ. protoxylemenUK
protoxylem the first XYLEM to differentiate from the primary MERISTEMS, with annular (ring-like) and spiral bands of thickening on the walls. Although dead, the cells are able to elongate as the adjacent cells grow in length. Protoxylem differentiates eventually into METAXYLEM.ThesaurusSeexylem |