木质部发生 meaning in Chinese
xylogenesis
Examples
- In seed plants the protoxylem occurs at the innermost edge of the vascular bundles in stems , but external to the later - formed xylem in roots
在种子植物中，原生木质部发生在茎的维管束的最内方，但在根中，位于后生木质部的外方。 - 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。 - Under the condition of different soil humidity and measuring time , a series of ecophysiological indexes , such as net photosynthetic rate , transpiration rate , stomatal conductance , the flow of water , atmospheric temperature , relative humidity , photosynthetic available radiation , and hydraulic conductivity are measured in order to find the factors which cause robinia xylem embolism
摘要在不同的土壤水分含量和不同的测定时间条件下，对刺槐的一系列生理生态指标：净光合速率、气孔导度、蒸腾速率、水势、大气温度、相对湿度、光合有效辐射以及导水率进行测定，探求刺槐木质部发生栓塞的影响因子。