海藻可以直接从开始蹦到结束，而导管植物不可以。
Algae can make the leap from start to finish directly, whereas vascular plants cannot.
这些条件有助于进化出用于支撑枝干的结构、运输水分和养分到植物各部分的导管以及储存水分的结构。
These conditions favored the evolution of the structures that support the body, vessels that transport water and nutrients to all parts of plant, and structures that conserve water.
如果森林干旱到一定的程度，夹杂着空气的水就会从导管进入植物内部——这就像燃油管里的气泡一样——植物会因此而死。
If the forest gets dry enough, air can get into the vessels that carry water through a tree - kind of like an air bubble in a fuel line - and a tree dies.
含笑属植物的导管分子大多具有梯状穿孔板，仅有一种可看到单穿孔板。
In contrast, most of the Michelia species possess scalariform perforation plates and only one with simple perforation.
伸长的细胞随后开始分化，形成根毛、导管等不同结构，于是植物的根便发育成熟了。
The elongation cell afterwardsstarts to split up, forms the root hair , the drive pipe and so on thedifferent structure, thereupon plant ' s root then grew maturely.
红树植物导管数量多、管孔小、机械组织为韧型纤维，薄壁组织次生加厚明显是适应环境的特征。
Many vessel numbers, small pore, libriform fibres (mechanical tissue)and obvious secondary thickening of xylem tissue are the features of adaptation to the environment.
大豆属植物导管分子中不同类型内含物的研究。
Study on the different types of inclusion in vessel elements of glycine l.
利用偏光显微镜和明场显微镜，首次报道了模式植物金鱼草幼苗初生维管系统木质部导管分子的发育、形成和连接过程。
The process of vessel element ' s promotion, formation and connection in primary xylem of antirrhinum majus, a model plant, was observed through micropolariscope and bright - field microscope.
本文对毛茛科38属88种植物导管分子的穿孔板结构进行了比较观察。
This paper deals with comparative studies of the perforation structures of vessel elements in 88 species of 38 genera of Ranunculaceae.
水分上升的动力主要来自于植物的蒸腾拉力和导管的毛细作用。
The impetus of water uptake is "transpiration pull"and capillarity phenomena.
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.
植物的超声发射是导管或管胞里空穴化时的伴随现象。
Ultrasonic emission is a phenomenon with cavitation of vessels or tracheids.
根据观察结果，对导管分子穿孔板的演化及黄三七属植物的系统位置进行了分析。
The evolution of the perforation plates of the vessel elements and the systematic position of genus Souliea were discussed in the paper based on the present observation .
根据观察结果，对导管分子穿孔板的演化及黄三七属植物的系统位置进行了分析。
The evolution of the perforation plates of the vessel elements and the systematic position of genus Souliea were discussed in the paper based on the present observation .
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