不同生境报春苣苔叶片解剖特征的比较研究

Abstract

以不同生境的报春苣苔叶片为研究对象，利用酶解法、透明法和石蜡切片法制片，对其解剖结构进行观察分析，结果表明：报春苣苔脉序为分枝曲行羽状脉，具四级叶脉。在不同生境中，随着洞穴的深入，其表皮毛密度、腺毛密度和气孔器密度逐渐变小；薄壁细胞间隙逐渐增大，维管束导管逐渐减少；气孔器类型、腺毛类型增多；洞内材料栅栏组织细胞大小不一，这些都是报春苣苔适应不同洞穴环境的表现。 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 ha-bitats, 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.