无瓣海桑叶结构的研究

利用石蜡切片法对无瓣海桑叶进行解剖研究.结果表明,无瓣海桑(Sonneratia a petala)的叶为等面叶,气孔类型为4(-5)细胞轮列型;叶中脉维管束为周韧维管束,有微弱形成层,并具内生韧皮部;叶具四级侧脉,第一级侧脉为半周韧维管束,第二级、第三级、第四级侧脉为外韧维管束;盐腺先由叶的表皮细胞发育成原基,再进一...

Study on the Leaf Structure of Sonneratia apetala

The leaf of Sonneratia apetala was anatomized by paraffin method to observe its structures.The results showed that the leaf of S.apetala is isobilateral leaf,belonging to 4(-5) cells verticillate type stomata.The vascular bundle of the midrib is amphicribral bundle with faint cambium and intraxylary phloem.The leaf has four veins,of which primary vein vascular bundle is semi-amphicribral bundle,and secondary,tertiary and quaternary vein vascular bundles are collateral bundle.The salt gland is developed from epidermis cells of leaf,experiencing 3 periods of epidermis cells differentiation,secreting cells for mation and salt gland maturation.Ultimately the salt gland consists of cavity,secreting cells and collecting cells,which widely distributes and has obviously ecological adaptability.