查询词典 phloem

The ultrastructural changes during the development of sieve element companion cell complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC tome from the same secondary phloem mother cell. The development of sieve element went through three stages, i. e. immature, mature, and degenerate stage. In immature stages the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost.

利用电镜技术研究美洲黑杨次生韧皮部筛管和伴胞发育过程中细胞超微结构的动态变化，观察到筛管和伴胞由同一个次生韧皮部衍生细胞分裂分化形成筛管约发育历经未成熟期、成熟期和衰退期的变化未成熟期筛管分子表现为细胞的径向扩展、壁的增厚、筛管质体和P-蛋白质的产生；成熟期筛管分子细胞组分发生选择性自溶，细胞核核质弥散状，核膜不清晰，或核膜清晰而核物质降解，最后细胞核完全解体转化为P-蛋白质类的物质；衰退期筛管分子细胞质完全解体消失，失去功能。

A plant tissue characteristic of the roots, located between the endodermis and phloem.

内皮层皮层的最内层，在根、茎的导管组织周围形成一道叶鞘

In the primary structure of root, the primary xylem is diarch and the development of both the primary xylem and the primary phloem is exarch.

在根的初生结构中，其初生木质部为二原型，木质部及韧皮部的发育均为外始式。

The cortical cells had thin walls and mitochondrium, and nucleus wassurrounded by chloroplasts, and vesicles were next to cell plasmalemma. However, cellwalls of velamen, cortex and exodermis in the mycorrhiza of D. nobile had ring orpapillary thickenings in many cases. The hyphae were surrounded by moremitochondria and vesicles of plant, and the hyphae were digested and their structure waschanged at last. The cell wall of endodermis also had typical ring thickenings, and manysieve orifices in sieve tube elements of phloem were covered by callose, while therewere liaison cords in a few sieve orifices.

金钗石斛菌根的根被细胞的细胞壁多处出现环形圈，外皮层细胞壁加厚，木质化，也有环形圈存在，皮层细胞细胞壁多角形明显，加厚，皮层细胞中存在被消化、失去结构的真菌菌丝，在菌丝周围有较多的线粒体、小泡，内皮层细胞的细胞壁呈现的典型的加厚及木质化环形圈，韧皮部筛管的筛板结构，绝大多数筛孔已为胼胝质所覆盖，仅个别筛孔中还存在连络索。

Any of various vascular plants,including seed plants and fern s,having a conducting system of xylem and phloem.

导管植物任何种类的维管植物，包括种子植物和蕨类植物，具有木质部和韧皮部导管系统

Researchers thought that florigen is made in the leaves as the length of the day changes and it is transported to the meristems, or growing tips of the plant, through the phloem network, which actively transports water, sugars and other molecules from the center of the plant to the periphery.

科学家认为成花激素是随着日长改变而在树叶中形成，然后通过韧皮部输送到分裂组织或是生长点。韧皮部主要负责从植物中心将水、糖分以及其它分子输送到周边组织。

Foraminate included phloem visible.When fresh cut end very similar to Jelutong in color.Usually large and stright logs imported.

新鲜材时原木横切面色泽近似Jelutong﹐进口原木通常是大径木﹐材干通直。

The correlation analysis indicated that the apple fruitlet weight was significantly positively correlated with the total Ca, Mg, K content of single fruitlet, and also with the diameter, number of vascular bundles, xylem thickness and phloem vascular bundles area of pedicel.

相关分析表明，苹果幼果的单果重和Ca、Mg、K含量与果柄的直径、维管束数目、木质部厚度、韧皮部维管束面积呈显著正相关，说明幼果发育与Ca、Mg、K吸收和果柄结构密切相关，Ca、Mg、K吸收率低和果柄发育不良可能是导致落果的重要原因。

In this paper, an in vivo experimental system-called the new berry-cup technique-is introduced for studying the sugar phloem unloading and the accumulation of sugar in ripening grape berries.

介绍了一种测定葡萄二次生长高峰期葡萄果实糖分卸载和积累的非离体试验体系－新浆果杯法。

This study indicates that the new berry-cup technique can be used continuously to measure the accumulation of sugar in ripening grape berries, and also is an ideal method for studying the mechanism of sugar phloem unloading and influence of inside and outside factors on the accumulation of sugar in ripening grape berries.

结果表明新浆果杯法可连续测定葡萄第二生长期果实糖分积累，是研究葡萄韧皮部糖分卸载机理和内外因子对葡萄果实糖分积累影响的理想方法。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。