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狭基巢蕨叶表皮的结构和气孔器发育的观察
周云龙; 陈焱;   
北京师范大学生物系
摘要:
狭基巢蕨Neotopterisantrophyoides(Christ)Ching叶片的上表皮无气孔器,仅具表皮细胞,下表皮由表皮细胞和气孔器组成,气孔指数为2.5。上下表皮细胞和气孔器的细胞中均含有叶绿体。每个气孔器由2个肾形的保卫细胞和2~6个副卫细胞组成,其中以3个和4个副卫细胞的占绝大多数(3细胞的占45.1%,4细胞的占43.5%)。从发育上看,气孔器原始细胞进行2次分裂,产生2个保卫细胞和1个同源的副卫细胞。气孔器的发育过程大体可分为4个时期:(1)气孔器原始细胞的分化和分裂期;(2)保卫细胞母细胞成熟期;(3)保卫细胞母细胞分裂和气孔器幼期;(4)气孔器成熟期。狭基巢蕨的气孔器属于中周型
关键词:  狭基巢蕨  表皮细胞  气孔器  叶绿体  
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