初生木质部 meaning in English
primary xylem
primery xylem
protoxylem
Examples
- Primary xylem xylem derived from the procambium in the young plant
初生木质部：指幼嫩植物中来源于原形成层的木质部。 - Protoxylem the primary xylem elements that are formed from the procambium first
原生木质部：初生木质部的成分，最早由原形成层形成。 - In nonwoody plants the primary xylem is the only water - conducting tissue , but in mature plants with secondary growth this function is mostly taken over by the secondary xylem
在尚未木质化的植物中，初生木质部是唯一的输水组织，但在具有次生生长的成熟植物中，该功能大多由次生木质部行使。 - 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。 - 8 the pith made of small parenchyma cells was long - oval , however the pith looked like a cross which devided the preliminary xylem into four parts was made of larger parenchyma cells . 9 there are well - developed aerenchyma in suaeda salsa , including large sub - stomatal chambers and intercellular spaces in palisade layer , spaces produced by lysigenous breakdown of cortical cells in stem and roots
侣）髓在对照中仅由有限数目的较小的薄壁细胞构成，髓的形状表现为长椭圆形， 50 、 100 、 200 、 400inmnaci处理下，髓中的薄壁细胞较大，细胞数目较多，髓呈“十”字形，将初生木质部分割为四部分，这一特殊现象在前人的工作中尚未报道。