vascular cylinder造句

• 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
  叶隙：叶迹从中柱分出的上方，初生维管柱上方出现的一些薄壁组织细胞，与茎的维管柱结构不同，它的侧向连接保证了茎叶维管系统的连续。
• 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，在商陆科的美洲商陆的子叶节区下部发现了一种具有双大括号状( “ { } ” )的维管柱类型。
• 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
  地上茎和根状茎之间在皮层细胞层数、周维纤维柱的有无、维管柱和髓所占比例、维管束束数、次生生长等方面存在差异，这些差异与它们各自担负的生理功能相关联。
• 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
  结果表明：气生不定根具有以下结构特征和发育特点： ( 1 )根为二原型，侧根正对着木质部发生； ( 2 )幼根内皮层细胞具凯氏带加厚，维管柱内紧挨中柱鞘内侧具有2 ~ 4层大型薄壁细胞； ( 2 )根中无髓和树脂道； ( 4 )次生结构发生于根毛区，维管形成层由初生木质部和初生韧皮部之间的薄壁细胞转化形成； ( 5 )中柱鞘和栓内层细胞富含单宁类物质； ( 6 )次生韧皮部有石细胞，次生木质部射线发达。
• 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 )随盐浓度的增加，茎皮层细胞层数未发生明显的变化，但皮层厚度所占茎的比重增加，维管组织占茎的比重同皮层厚度与茎半径的比值表现出相同的趋势。