网络释义专业释义
外方为最先分化成熟的木质部,称原生木质部 (Protoxylem),导管直径较小,多呈环纹或螺纹;后分化成熟 的木质部,称后生木质部 (metaxylem),导管直径较大,多呈 梯纹、网纹或孔纹。
基于487个网页-相关网页
protoxylem lacuna [植] 原生木质部腔隙
protoxylem pole [植] 原生木质部极
protoxylem strand 原生木质部束
protoxylem vessel 原生木质部导管
protoxylem m 初生木质部
endarch protoxylem 内源型先成木质部
protoxylem gap 原生木质部隙
柯林斯英汉双解大词典
protoxylem /ˌprəʊtəˈzaɪləm/
-
1.
N the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin 原生木质部 → compare metaxylem
双语例句
-
It is found in protoxylem and first metaxylem tracheids and vessels.
可在原生木质部和初始后生木质部的管胞和导管中见到。
-
Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
环状加厚：原生木质部导管和管胞的内层环状増厚。
-
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
应用推荐