初生木质部的成分，最早由原形成层形成。
Protoxylem the PRIMARY xylem elements that are formed from the procambium first.
可在原生木质部和初始后生木质部的管胞和导管中见到。
It is found in protoxylem and first metaxylem tracheids and vessels.
如用圆木杆，可削去顶端树皮，露出木质部的明亮色泽。
If timber poles are used, the bark can be peeled off the tops to expose the light colored sapwood.
在植物弱蒸腾情况下，木质部的水分处于正压状态，这种压力叫根压。
The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.
瘤组织中的薄壁细胞均增生肥大，木质部的垂直管胞发生变形且变短。
Parenchyma in gall tissues were observed to occur hypertrophy or hyperplasia, and vertical tracheids in gall xylem were short and abnormal in shape.
是初生木质部的内，外方都有初生韧皮部分布的一种维管束排列方式。
Bicollateral bundle the arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem.
在茎原生木质部和次生木质部的形成过程中可以看到这种类型的分化。
Basipetal differentiation is seen in the formation of proto-and metaxylem in the stem.
实验结果表明：阳生环境和阴生环境水蜡树叶片、幼茎、次生木质部的结构存在差异。
The results showed that there were differences in the structure of leaves, caulicle andsecondary xylem of L. obtusifolium Sieb. et Zucc. lived in shade and sun environment.
结果：野生狭叶柴胡的木栓层，韧皮部，木质部的显微特征均于药典上的记载有所不同。
Result: The phellem, phloem and xylem of wild bupleurum scorzonerifolium are different from those in the pharmacopoeia .
残存的韧皮部也可以脱分化形成愈伤组织，此外，还存在愈伤组织源于木质部的情况。
The rest of phloem also produced callus through dedifferentiation. In addition, there was callus from xylem.
罗德里格斯·马丁博士对被他砍倒的树的韧皮部采样后，他发现韧皮部的汞含量比木质部的要高。
When Dr Rodriguez Martin sampled the phloem of the trees he had chopped down, he found it much richer in mercury than their xylem.
对红树林植物榄李的花、叶、皮及木质部的研究表明，其主要化学活性成分是三萜、 甾醇、 单宁及长链脂肪酸。
The present paper reviewed the recent progresses on the chemical constituents and pharmacoactive of mangrove plant-Lamnitzera racemosa.
本文对我国木兰科的39种木兰属和含笑属植物次生木质部的导管分子进行了初步分析。两属导管分子的长度和宽度略有差异。
This paper deals mainly with comparative studies on elements of secondary xylem in 39 species of Chinese Magnolia and Michelia.
他的观点是，在某种程度上二者均由运输物质的网络构成——公路，铁路，水路以及煤气管，污水管还有电缆线都在输送物质，动物血管和植物运输汁液的木质部、韧皮部也是如此。
Roads, railways, water and gas mains, sewage pipes and electricity cables all move things around. So do the blood vessels of animals and the sap-carrying xylem and phloem of plants.
但网络的最边缘——叶子，却具有不同的结构，与木质部和韧皮部不同，叶子的纹路交叉并成环。
But the very end of such a network, the leaf, has a different architecture. Unlike the xylem and phloem, the veins in a leaf cross-link and loop.
修剪去病枝、枯死的木质部，然后是互交的枝：目的是为了改善通风，减少疾病。
Remove diseased, dying or dead wood, then any stems that cut across each other: this improves air flow and lessens disease.
蕨类植物和针叶树的木质部仅含有管胞。
中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。
The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem .
中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。
The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem.
构成年轮的组织被称为木质部。
单中柱：原生中柱的一种类型，是由韧皮部、中柱鞘和内皮层包围着内方的木质部构成的实心中柱。
Haplostele a type of protostele having a solid strand of stele with the xylem on the inside encircled by phloem pericycle and endodermis.
在老茎中，仅最新的木质部环参与物质的运输。这些木质部环组成边材。
In older stems, only the most recent rings of xylem participate in the transport of materials. these make up the sapwood.
栽培丹参根的周皮细胞层数少、色淡，韧皮部与木质部比值小，而野生丹参根的周皮细胞层数多、颜色重，韧皮部与木质部比值大。
In cultivated salvia miltiorrhiza roots light-colored periderm contained less layers of cells and low ratio of phloem to xylem compared with those in wild salvia rniltiorrhiza roots.
蕨类植物的木质部只含有管胞。
环状加厚：原生木质部导管和管胞的内层环状増厚。
Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
杨树木材主要指次生木质部，是主要的产品器官。
The poplar timber points the secondary xylem mainly, is a main products organ.
叶脉中木质部比重越大，越有利于水分的传输。
茎由皮层。木质部和海绵状的髓组成。
The bine is comprised by cerebral cortex, xylem and fungous marrow.
质外体是木质部外方物质运动的一个重要途径，例如物质穿过根冠。
It is an important pathway for movement of these substances outside the xylem, for example across the root cortex.
木材（次生木质部）是树木形成层细胞分化的产物，形成层的活动方式不仅影响木材的产量，而且影响木材的结构和性质。
Wood is the product of cambial activity in trees, and the seasonal activity style of cambium directly influences wood biomass production, structures and properties.
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