蕤核的花粉形态及叶片微观结构

运用光学显微镜和扫描电镜对蕤核的花粉形态及叶片微观结构进行了观察。结果表明:蕤核花粉体积小,近球形,辐射对称,具三沟,外壁具条纹状纹饰。上下表皮均有角质层,但形态不同。下表皮有气孔分布,气孔略下陷,气孔密度每平方毫米200～300个,气孔存在三种状态。叶片为异面叶,栅栏组织细胞由2～3层柱状细胞构成,排列紧密,海绵组织由管状细胞构成,细胞间隙大。蕤核虽属于中生植物,但叶片微观结构趋近于旱生植物的特征。

Pollen morphology and leaf microstructure of Prinsepia uniflora

The method of scanning electron microscopy and light microscope were used to research the pollen morphology and leaf microstructure of Prinsepia uniflora. The results were as follows:the pollen was small,nearly spherical and radial symmetry with tricolpate, with striate on outer wall. The leaf was bifacial leaf,whose upper and lower epidermis cells had the stratum corneum. The stomata existed in lower epidermis with three statuses and sank slightly. Stomatal density was about 200 to 300 per square millimeter. The palisade tissue was constituted by the 2 to 3 layers cylindrical cells and packed tightly,while the spongy tissue was constituted by the tubular cells with large gap between cells. Although P.uniflora was mesophyte,the leaf microstructure approached to xerophyte feature.