第三书物质在值物体内的运输
第三节 物质在植物体内的运输
Apical menstem Terminal bud Primary Blade Diagram growth zon Vein of plant Secondary body growtn zone (vascular cambium) Nod Vascular system Pith Prmary growth zone Apical meristem
Diagram of plant body
茎的结构与发育 (一)茎的基本形态 1、茎的外形 茎stem:是植物地上部分的轴,其上着生叶、花和黑实 起源于种子内幼胚的胚芽,有肘还加上部分下胚輻。 校系 shoot:着生叶和茅的的茎称为枝或枝条 shoot 芦nole:茎上着生叶和的位置 芦间 internode:两节之间的部分叫节间 叶寝 leaf scar:茎上的叶子脱落后留下的痕迹 多数落叶乔木和灌木的冬枝,除了节、节间、和荠以外,还可 看到叶痕、茅痕、维管東痕、芽鳞痕和皮孔等
（一）茎的基本形态 1、茎的外形 茎stem: 是植物地上部分的轴，其上着生叶、花和果实. 起源于种子内幼胚的胚芽，有时还加上部分下胚轴。 枝条shoot: 着生叶和芽的的茎称为枝或枝条shoot 节node: 茎上着生叶和芽的位置. 节间intenode: 两节之间的部分叫节间 叶痕leaf scar: 茎上的叶子脱落后留下的痕迹. 多数落叶乔木和灌木的冬枝，除了节、节间、和芽以外，还可 看到叶痕、芽痕、维管束痕、芽鳞痕和皮孔等。 一、 茎的结构与发育
种子的结构 Apical meristem of shoot Fruit and First seed coat foliage fused together Endosperm mer stem Coleoptile first root Seed coat Foliage FIGURE 34-2 A bean seed split open to reveal the embryo. Food is stored in Apical the bean embryo's seed leaves, the cotyle- meristems dons. The apical meristem of the shoot is hidden between the first foliage leaves
种子的结构
ue34.14 Germination, The radicle, the root of the embryo, emerges from the seed furst Then the shoot breaks the soil surface by one of Cotyledons the following mechanisms: (a) In beans straightening of a hook in the hypocoty ulls the shoot and cotyledons from the Seed ceat boiL. (b) In peas. the hook is above the cotyledons on the epicotyl, and the cotyle dons remain in the ground. (c) In com and other monocots, the shoot grows straight up through the tube of the coleoptile 出土萌发 fal Bean 下胚伸长 Hypocotyl Cobbled Thi Pe 留土萌发 上胚仲长 胚茅鞘
留土萌发 出土萌发 下胚轴伸长 上胚轴伸长 胚芽鞘