每个维管束的韧皮部外面有数层厚壁细胞，增加叶柄的机械支持作用。
There are some sclerenchymatous cells outside the phloem of each vascular bundle to increase the supporting force of the petiole.
以生物制片和光学显微技术研究了尼泊尔马桑根瘤维管束的形态结构和发育特点。
Morphological structure and the development of nodular vascular bundles of Coriaria nepalensis Wall. were studied by microscopical techniques.
而油细胞的颜色，非腺毛、叶迹维管束及维管束的多少则是显微上的主要区别点。
The color of Oil cell, the number of non-glandular hair, leaf-trace bundle and vascular bundle are distinct in micro-character.
维管束植物会产生一系列不同的小分子信号物质，就是所说的植物激素，它们调控着植物的生长分化进程。
Vascular plants produce an entire series of different small signalling molecules, so-called phytohormones, which regulate growth and differentiation processes.
根据萼片内的许多维管束结构，通常认为其由叶发育而成。
Sepals contain several vascular bundles, and are thought to be derived from leaves.
包括根或茎的维管组织及相关薄壁组织，若有维管束鞘和内皮包被则这二者也属于中柱结构。
Stele the vascular tissue and associated parenchyma tissue and (if present) the surrounding pericycle and endodermis of a stem or root.
例如在雌雄异株物种中的雌性植物和雄性植物，气生的和被水浸没的叶片，生活史中的配子体与孢子体的交替，叶肉和维管束鞘叶绿体等。
Examples include male and female plants in dioecious species aerial and submerged leaves alternation of gametophyte and sporophyte stages of a life cycle and mesophyll and bundle-sheath chloroplasts.
木质部在维管束植物中的起支撑作用和输水作用的组织，主要由管胞和管道组成；
The supporting and water-conducting tissue of vascular plants, consisting primarily of tracheids and vessels; woody tissue.
调查了佛山市16个村落的风水林，发现植物种类非常丰富，共有维管束植物255种，隶属于88科189属。
Through investigating, abundant tree species including 88 families, 189 genuses, 255 species were found in Fengshui woods at 16 countries of Foshan city.
显微镜观察表明在烟草发根的维管束中柱鞘细胞、水稻根皮层细胞内和细胞间隙有根瘤菌存在。
The observation under microscope showed that the rhizobia were present in percycle cells of vascular system of the tobacco hairy roots and in cortex cells and intercellular spaces of rice roots.
表明水分亏缺显著改变了小麦穗轴维管束系统的显微解剖结构。
It showed that the vascular bundle system of rachis in wheat changed apparently under water deficit.
所有维管束都互相连通，因而得以迅速而有效地完成器官之间的运输。
All the vascular bundles are interconnected so that transport between organs carried on rapidly and efficiently.
解剖学方法观察发现，这些畸形胚的维管束系统不明显或形态异常。
The bundle system of these abnormal embryoids were unclear or abnormal shaped by dissect anatomy observation.
在全球范围内估计有29500余种附生植物，其中维管束附生植物的种类高达24000种，约占总维管束植物种类的10%。
It was estimated that there are 29500 epiphytic species, including 24000 vascular epiphytes that account for 10% of the total vascular species in the world.
次生加厚分生组织起源于正常的散生维管束中柱外侧的薄壁组织细胞。
The secondary thickening meristem originated from the parenchyma cells, which were located the outside of the atactostele.
根据15年的调查结果，对浙江省水生维管束植物的区系与地理分布特点进行了研究。
The floristic features and geographical distribution of aquatic vascular plants were summarized in Zhejiang Province based on 15 - year investigations.
针对胶州湾海岸湿地发生的退化现象，提出了保护胶州湾海岸湿地维管束植物的初步措施。
In light to the degradation of coastal wetlands in Jiaozhou Bay, some countermeasures were put forward to protect the vascular plants.
茎的初生结构中多个维管束排列成环状，节部为单隙三迹，叶迹分别来自于3条维管束或同一条维管束。
The vascular bundles of the primary structure in stem are ring arranged, and the node is unilacunar and 3-traced, which is from three vascular bundles or one vascular bundle.
穗颈维管束数主要受遗传因素控制，环境条件的影响相对较小。
The number of vascular bundles in neck-panicle was mainly controlled by genetic factors.
它们的内部结构是由气道、不同大小的维管束、基本组织以及厚壁组织组成。
Their internal structures consist of air passages, vascular bundles of various size, ground tissues and sclerenchyma.
合欢种皮侧缘厚壁(薄壁)细胞层中有维管束，它为种皮的发育提供水分与营养。
The vascular bundles in stereid layer or Parechymatous cell layer of lateral margin of its testa provide the testa development with water and nutrition.
维管形成层向两侧延伸直至形成一个茎内的分生组织环，各个维管束被束间形成层联系在一起。
The vascular cambium extends to form a complete ring of meristematic tissue around the stem, the separate vascular bundles being linked by interfascicular cambium.
植物激素通过影响砧木和接穗间维管束桥形成的时间和数目调控嫁接组合的发育。
Plant hormones controlled the formation of graft unions through influencing the time and the number of vascular bridges formation between the stock and the scion.
尽管薇甘菊叶片为典型C3植物特征，结果发现了茎以及主叶脉内存在类似C4途径的、具有丰富叶绿体的维管束鞘结构。
Although leaf photosynthesis of this weed is of the C3 type, a C4-like vascular bundle full of chlorophyll was observed in the main vein of the leaf and young stems.
随着北京地区人口的增多，人类活动范围越来越大，野生维管束植物的分布也逐渐发生了变化。
Following population growing and human activity bigger and bigger, the distribution of wild vascular bundle is gradually changing in Beijing.
自花梗顶部至子房室基部，维管束系统发生复杂的变化。
The vascular system changed complexly from the top of the pedicel to the base of the locule.
本文分析了该区维管束植物科、属的种类组成，阐述了构成森林的主要植物类群及其分布。
The composition of the species, genera and families was analyzed, and the main plant groups and their distribution were also described.
这种维管束斜生于茎内的部分，称为叶迹。
These parts of bundles in the stem be regarded as leaf trace.
利用盆栽试验研究了水分亏缺对抽穗期小麦穗轴维管束系统的影响。
Pot experiments were carried out to study the effect of water deficit on vascular bundle system of rachis in wheat during heading stage.
利用盆栽试验研究了水分亏缺对抽穗期小麦穗轴维管束系统的影响。
Pot experiments were carried out to study the effect of water deficit on vascular bundle system of rachis in wheat during heading stage.
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