vascular cylinder 中文意思是什麼
vascular cylinder
解釋
【植物；植物學】維管柱 （＝ stele）。-
4. the studies focused on the cnz of dianthus barbatus and saponaria offlcinalis seedlings applied two different vascular cylinder types, even through they both were " " - shape exarch and diarch haplostele, their patterns of protoxylem and m
此外，在商陸科的美洲商陸的子葉節區下部發現了一種具有雙大括號狀（ 「 { } 」 ）的維管柱類型。 -
We have observed the following characteristics of anatomical structure and development : ( 1 ) the primary roots belong to archetype and the lateral roots occur in the position toward the xylem of the vascular cylinder ; ( 2 ) the root endodermis consists of thicken casparian strips, and there are from two lo four layers parenchyma cells near the pericycle ; ( 3 ) the pith and resins canals are absent in the toots ; ( 4 ) secondary structure occurs in the root hair zone, and vascular cambium is formed from the parenchyma cells between the primary xylem and primary phloem ; ( 5 ) tanning materials are abundant in pericycle cells and phelloderm cells ; ( 6 ) sclereids are found in secondary phloem, and rays are rather rich in secondary xylem
結果表明：氣生不定根具有以下結構特徵和發育特點： （ 1 ）根為二原型，側根正對著木質部發生； （ 2 ）幼根內皮層細胞具凱氏帶加厚，維管柱內緊挨中柱鞘內側具有2 ~ 4層大型薄壁細胞； （ 2 ）根中無髓和樹脂道； （ 4 ）次生結構發生於根毛區，維管形成層由初生木質部和初生韌皮部之間的薄壁細胞轉化形成； （ 5 ）中柱鞘和栓內層細胞富含單寧類物質； （ 6 ）次生韌皮部有石細胞，次生木質部射線發達。 -
Leaf gap ( lacuna ) a region of parenchyma differentiated in the stem vascular cylinder immediately above a diverging leaf trace. lateral connections insure no break in the vascular system
葉隙：葉跡從中柱分出的上方，初生維管柱上方出現的一些薄壁組織細胞，與莖的維管柱結構不同，它的側向連接保證了莖葉維管系統的連續。 -
The stems and rhizomes were observed to differ in cortex - cell layer, perivascular fiber - ring presence, vascular cylinder and pith proportions, vascular bundle number and secondary growth and these differences were associated with their own physiological functions
地上莖和根狀莖之間在皮層細胞層數、周維纖維柱的有無、維管柱和髓所佔比例、維管束束數、次生生長等方面存在差異，這些差異與它們各自擔負的生理功能相關聯。 -
5 layer number of cortical cells in stem was n ' t changed evidently, however the ratio between cortical thickness and stem increased as well as the ratio between vascular cylinder and stem, up the gradient of nacl concentration. 6 stem dm of suaeda salsa remarkably decreased with increasing nacl concentration, so did the vessel dm of xylem in the stem
（ 5 ）隨鹽濃度的增加，莖皮層細胞層數未發生明顯的變化，但皮層厚度所佔莖的比重增加，維管組織占莖的比重同皮層厚度與莖半徑的比值表現出相同的趨勢。 -
Roots also differ from roots in the arrangement of xylem and phloem, having a solid central strand of vascular tissue rather than a hollow cylinder of conducting tissue
根和莖不同，它無葉綠素，沒有芽和葉，木質部和韌皮部的排列順序也不同，其內部為實心的維管組織，而莖的內部為中空的圓柱形輸導組織。
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