构成年轮的组织被称为木质部。
蕨类植物的木质部只含有管胞。
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.
蕨类植物和针叶树的木质部仅含有管胞。
中午木质部水势与叶片角有显著相关性。
Blade Angle is strikingly correlated to xylem water potential at midday.
专门用来运输矿物元素的系统称为木质部。
A system confined to the transport of mineral elements is known as the xylem.
叶脉中木质部比重越大，越有利于水分的传输。
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.
次生木质部由孔纹导管、薄壁组织及射线所组成。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
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.
在横切面上，次生韧皮部的面积比次生木质部大得多。
In the transection section, the area of secondary phloem is much larger than secondary xylem.
初生木质部：指幼嫩植物中来源于原形成层的木质部。
Primary xylem xylem derived from the procambium in the young plant.
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.
维管束由维管束鞘、木质部、韧皮部和大型薄壁细胞组成。
The vascular bundle consists of vascular bundle sheath, xylem, phloem and big parenchymatous cells.
在领春木次生木质部中也观察到了端壁多穿孔板及侧壁穿孔板。
Multiple end wall and lateral-wall perforation plates were also observed in the secondary xylem.
夏季芽接可削取芽片，或少带木质部芽片，在砧木茎干处剥皮。
Summertime bud grafting can be cut take shoot piece, or take xylem shoot less piece, in stock bine dry place decorticates.
对杂交枸树木质部进行了硫酸盐法和APMP制浆性能的试验。
Kraft pulping and APMP pulping of the xylem of hybridized citron tree were investigated.
同化物在韧皮部中以液流形式运输，液流中的水主要来自木质部。
The assimilate transports in the phloem by liquid form and the water of the liquid mainly comes from the xylem.
处在酸性垒的原植物次生木质部组织被二氧化硅替换而成硅化木。
The secondary xylem of the original plants in local acidic environment was replaced by silica and turned into fossil woods.
幼虫蛀食髓部及木质部，形成隧道，严重影响养分和水分的传导。
The larvae tunnel into the stems and interrupt the conduction of water and nutrients.
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.
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.
结果大黄中的活性成分含量以韧皮部最高，髓部次之，木质部最低。
Result The active component content in phloem was the highest, while, successively, in pith and in 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.
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.
伸向子叶的子叶迹，直接由原生木质部极外面的一群薄壁组织细胞分化形成。
The extending cotyledon traces differentiate directly from the parenchymatous cells which locate on the outside of the poles of primary xylem.
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.
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.
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.
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