无瓣海桑叶结构的研究

Study on the Leaf Structure of Sonneratia apetala

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 apetala)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,再进一步发育,其发育过程可分为表皮细胞分化期、分泌细胞形成期以及盐腺成熟期3个阶段,最终发育形成具腔室、分泌细胞和收集细胞的盐腺,盐腺分布广泛,具有明显的生态适应性。

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.