英语词汇“protoxylem”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	protoxylem
释义	protoxylem enUK protoxylem (ˌprəʊtəˈzaɪləm) n (Botany) the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin. Compare metaxylem pro•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. protoxylem enUK 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. protoxylem enUK 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
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protoxylem