Tree rings are made of tissue called xylem.
构成年轮的组织被称为木质部。
The xylem of ferns only contains tracheids.
蕨类植物的木质部只含有管胞。
The xylem of ferns and conifers contains only tracheids.
蕨类植物和针叶树的木质部仅含有管胞。
Large proportion of xylem benefit to the water transfer.
叶脉中木质部比重越大，越有利于水分的传输。
Wilting toxins can induce to block the xylem of cotton seedling.
致萎毒素可引起棉苗维管束系统堵塞。
The bine is comprised by cerebral cortex, xylem and fungous marrow.
茎由皮层。木质部和海绵状的髓组成。
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。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
次生木质部由孔纹导管、薄壁组织及射线所组成。
Blade Angle is strikingly correlated to xylem water potential at midday.
中午木质部水势与叶片角有显著相关性。
A system confined to the transport of mineral elements is known as the xylem.
专门用来运输矿物元素的系统称为木质部。
Nuclei in mature xylem cells belong to nutritious nuclei and they are stable.
成熟木材细胞中的细胞核属于营养核，是一个稳定的特征。
The poplar timber points the secondary xylem mainly, is a main products organ.
杨树木材主要指次生木质部，是主要的产品器官。
The discovery of nuclei existing in mature xylem cells is a new one in Wood Anatomy.
在成熟木材细胞中发现细胞核是木材解剖学的新发现。
Kraft pulping and APMP pulping of the xylem of hybridized citron tree were investigated.
对杂交枸树木质部进行了硫酸盐法和APMP制浆性能的试验。
In the transection section, the area of secondary phloem is much larger than secondary xylem.
在横切面上，次生韧皮部的面积比次生木质部大得多。
Multiple end wall and lateral-wall perforation plates were also observed in the secondary xylem.
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。
The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.
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 vascular bundle consists of vascular bundle sheath, xylem, phloem and big parenchymatous cells.
维管束由维管束鞘、木质部、韧皮部和大型薄壁细胞组成。
The secondary xylem of root is well developed, and there is supernumerary cambium around the vessels.
块根的次生木质部发达，导管周围存在额外形成层。
Result The active component content in phloem was the highest, while, successively, in pith and in xylem.
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。
The harmful effect of injecting chemical into tree on the xylem, bast, periderm and tree body was studied.
本文就树干注入农药，对木质部、韧皮部及周皮和整个树体是否产生不良影响做出评价。
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 rest of phloem also produced callus through dedifferentiation. In addition, there was callus from xylem.
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 assimilate transports in the phloem by liquid form and the water of the liquid mainly comes from the xylem.
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。
It is an important pathway for movement of these substances outside the xylem, for example across the root cortex.
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。
In older stems, only the most recent rings of xylem participate in the transport of materials. these make up the sapwood.
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。
Summertime bud grafting can be cut take shoot piece, or take xylem shoot less piece, in stock bine dry place decorticates.
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。
The secondary xylem of the original plants in local acidic environment was replaced by silica and turned into fossil woods.
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.
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。
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