Comparative Studies of Leaf Anatomical Characteristics of Primulina tabacum in Different Habitats

This study used the leaf in different habitats as research object. The leaf structures of Primulina tabacum were studied by enzymatic hydrolysis, transparent and paraffin sectioning under a light microscope. Through observing and analyzing the anatomical structure, the results showed that: P. tabacum had branch-camptodromous pinnate venation, the leaves had four veins. In different habitats, with the deepening of the cave, the density of epidermal hairs, glandular hairs and stomatal apparatus became smaller. In the parenchyma cells clearance increased gradually, vascular bundle vessels gradually reduced. The types of stomatal apparatus and glandular hairs increased. The sizes of palisade tissue cells in inner cave were different. These were the characteristic of P. tabacum adapt to the environments in different caves.