药用植物学课茎.pptVIP

茎(stem) Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  1认识外部形态 Ue 第一小节正常茎形态 第二小节茎的类型 *第三小节变态茎的形态与类型 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  2认识内部构造* 木通 大血藤 鸡血藤 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  第一小节正常茎的形态 一.茎的外形 1.通常呈圆柱形。 2.中心一般实心 圊柱形三檯形四形多角形扁平形空心 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  3.节和节间 节:着生叶的部位。节间:节与节之间的部分。 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  4.叶腋(axi):茎与叶形成的夹角。在茎的顶端和 节处叶腋有*芽(bud Axillary bud Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  5枝:带着叶的茎。有时有长枝和短枝之分,一般 短枝着生在长枝上,能生花结果。 苹果短枝 苹果长枝 长枝:节间长 短枝:节间短 白杨短枝 白杨长枝 长枝短枝特征 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  6叶痕和叶迹( eaf scar., leaf trace): 叶痕-叶脱落后留下的痕迹 叶迹-叶痕中由茎通向叶柄的维管束留下的痕迹 木本植物的茎枝上常见有叶痕托叶痕( stipule scar) 芽鳞痕( bud scale scar)和皮孔( lentic等 Valadon onry. ch Asposeslides for NET 4o dient P Evaluation only. Created with Aspose Slides for NET 4.0 dient Profilo 71 Copyright 2004-2017Aspose Pty L  二、芽及其类型 *芽是处于幼态而未伸展的枝、花或花序,也就是枝、花或花 序尚未发育的原始体。 顶芽( terminal bud 定芽( normal bud){腋芽(侧芽, axillary bud (1)芽的生长位置 副芽( accessory bud) 不定芽( adventitious bud) (2)芽鳞的有无鳞芽( scaly bud)裸芽( naked bud) 叶芽( eaf bud) (3)芽的发育性质 花芽( flower bud) 混合芽( mixed bud) V