[农学]浙江大学2012植物学甲课件 第04次课2008ppt第51到99页.pptVIP

Late wood is composed of thick-walled fiber-tracheids Early wood is composed of larger thin-walled tracheids 管胞 Sequoia sp. 一种杉木 Resin duct epithelial cells represent axial parenchyma 树脂道周围细胞是一种轴向的薄壁细胞 Gymnosperm lack pores (vessels) 裸子植物无导管 Rays are uniformly thin (mostly uniseriate) In this Larch (Larix sp. 一种落叶松) 落叶松茎具有均一的、单行的射线。 Compare of wood between the Gymnosperm and Angiosperm 裸子植物和被子植物木材的比较 Special structure of woody monocots 木本单子叶植物的特殊结构 次生维管束和基本组织 Jushua tree ( Yucca brevifolia) 生长在荒漠上的龙舌兰科植物 Summary 概括 Stem and leaf structure of Moss 苔藓植物茎、叶的结构 Marchantia is no stem, only has leaf and pseudo-roots. Note the pore. 地钱没有茎，只有叶和假根。注意气孔。 Stem and leaf structure of Moss 藓植物茎的结构 Showing central column of hydroid cells surrounded by a sheath of leptoids cells (sieve elements). 中柱由输水的细胞 和围在外面的筛胞分子组成。 Stem structure of Fern—Vascular Plants 蕨类植物茎的结构 1. Pisilotum 松叶蕨 Simple vascular structure belongs to protostele, phloem surrounding the exylem. 维管结构简单， 属于原生中柱， 韧皮部围绕木 质部。 2. Equisetum 木贼 The center of the pith is torn apart, Forming a pith canal. 髓的中央中空， 形成一个髓 腔。 接近单子叶. 内皮层 胞间道 维管束 Reconstructure of a carboniferous period swamp forest 石炭纪沼泽森林景观重建 3. Diphasiastrum 石松类 A protostele, showing xylem and phloem. Note the large air spacers in the cortex. 原生中柱，表明木质部和韧皮部。注意在皮层中的大量气腔。 No pith 3. Diphasiastrum 石松类 3. Selaginella 卷柏类 The protostele is suspended in the middle of the hollow stem. Note the trabeculae ( endodermal cells) 原生中柱悬在中空茎的中央，注意内皮层细胞 4. Fern 真蕨类 Tree fern, Dicksonia, 树蕨维管束 Adiantum， 铁线蕨 Have the different protostele. 真蕨有不同的原生中柱。 4. Fern 真蕨类 Have the different protostele. 真蕨有不同的原生中柱。 The xylem forms a complete ring In many ferns. Phloem occurs on both the exterior and interior of the xylem Section 4 Morphology, structure and development of leaves 第四节 叶的形态、结构及生长发育 Leaves, the lateral organs of a shoot, typically have a more-or-less flattened