6种松科植物叶表皮的扫描电镜观察

应用扫描电子显微镜,观察了松科(Pinaceae)3个属6种植物叶表皮特征.金钱松气孔带位下表面,气孔区与非气孔区表皮细胞形态差异很大,气孔细缝状;雪松针叶四面都具气孔线,气孔下陷,孔口光滑,针叶表面具较厚的角质层,表皮细胞形状观察不清;五针松针叶仅两腹面有气孔线,气孔有隆起的圆环围绕,表面角质层呈条纹状排列,形成一种沟槽;黑松、湿地松、马尾松针叶腹背面都有气孔线,气孔呈蜂窝状排列成行,气孔下陷,孔口角质化强烈.结果表明松科3个属植物叶表皮的形态结构及气孔器差异显著,一定程度上证实了3属是自然的分类群.

SEM observation on leaf epidermis of 6 species in Pinaceae

The studies on the leaf epidermal characters of Podocarpus macrophyllus and 6 species belong to Pseudolarix Gord, Cedrus Trew, Pinus Linn were conducted with scanning electron microscope(SEM). Under the SEM, we can find that in all species observed, the outer surface of leaf is covered with a cuticle and epicuticular waxes. In Pseudolarix amabilis, the stoma threads are located on the adaxial epidermis of leaves, and the epidermal cells are quite different between its upper and lower epidermis. Stoma threads are located on each epidermis in Cedrus deodara, the stoma are rounded smooth cuticle. In Pinus parviflora, stoma threads are only located on the abaxial epidermis, and its stomata are stand out of the epidermis. In Pinus massoniana, Pinus thunbergii and Pinus elliottii, the stoma threads are located on both abaxial and adaxial epidermis. The results showed that there are some differences including the structure and morphology of leaf epidermis and the distribution characteristics of the stomata apparatus, they proved that the division of three genera was natural.