海南莎草属植物叶下表皮微形态的研究

利用光学显微镜对海南莎草属(Cyperus Linnaeus)15个种1个变种的叶下表皮微形态进行了研究。结果显示:(1)该属叶下表皮微形态基本特征如下:长细胞为长筒形、短筒形,少数为近方形,边缘波状、深波状;无短细胞的存在;副卫细胞为高圆屋顶形、圆屋顶形、圆屋顶至三角形或三角形;(2)根据保卫细胞的形态将海南莎草属分为两大类型即保卫细胞两端明显加厚型和保卫细胞两端不明显加厚型;(3)海南莎草属叶下表皮微形态一致,表明莎草属是一个自然类群,但在莎草属种间叶下表皮的长细胞形态、保卫细胞及副卫细胞形态、气孔长宽等存在一定的差异,可作为本属种间分类鉴别的参考依据。

Leaf Abaxial Epidermis Structures of Cyperus from Hainan

The leaf abaxial epidermis structures of 15 species and 1 variety of the genus Cyperus Linnaeus from Hainan were studied under light microscope.The results showed that(1) the leaf micro-morphological characteristic is as follows: the shape of long-cells long tubular or short tubular,rarely sub-tetragonal,the margin of cell walls sinuosity and deeply sinuosity;short cells in absence;stomatal subsidiary cells tall dome-shaped,dome-shaped,triangular,dome-shaped to triangular;(2) on the basis of guard cells,Cyperus from Hainan could be divided into two types: both sides obviously thickening and not obviously thickening;(3) the micro-morphology of leaf abaxial epidermis structures of Cyperus from Hainan was consistent,indicating the genus Cyperus is a natural group.However,different characteristics existed among species,including the shape of long-cells,length/width of stomata,the shape of guard cells and the shape of subsidiary cells,which could be used for the taxonomy of the genus at the species level.