筛孔
关键词: 筛孔来源: 互联网
韧皮部里,相连接的筛管分子间的端壁上有许多小孔,这些小孔叫做筛孔。筛孔常成群分布,构成一定区域,这些具有筛孔的区域,叫做筛域。相邻的筛管分子借着穿过筛孔的原生质丝形成的联络索互相连接,以沟通彼此间的营养物质运输。在筛管分子的侧壁上,也往往有筛域。
推荐方法
- 蕨类植物门(Pteridophyta) 石松亚门(Lycophytina)、楔叶亚门(Sphenophytina)
- 燕麦弯曲试法
- 冬孢菌纲(Teliomycetes)
- 广藿香
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