沟稃草属叶表皮微形态的研究

摘要

The micromorphology of the leaf lower epidermis for 19 species belonging to Aniselytron and its related genera of Poaceae were observed by scanning electron microscope. The result showed that the epidermal structure of Aniselytron and its related genera contained long cells, short cells, subsidiary cells and prickle⁃hairs et al. The appearance and distribution of them were inconsistent. The intercostal long cells in Aniselytron were rhomboid, and the long cell outlines were straight. The intercostal short cells occurred solitary or together with prickles. The shapes of silica cells in costal zones were nodular. Parallel⁃shaped subsidiary cells were found, and prickles frequently occurred both in costal and intercostal zones. The micromorphology characteristics of leaf epidermis revealed that Aniselytron was closely related to Poeae, and a distantly related to Calamagrostis s. l. , Agrostideae and Aveneae. According to the micromorphology of the leaf lower epidermis, we draw the conclusion that Aniselytron should be placed in Poeae.%利用扫描电子显微镜对禾本科沟稃草属及其近缘类群8属19种植物叶下表皮微形态进行比较研究。结果显示，所研究的沟稃草属及其近缘属叶下表皮结构由长细胞、短细胞、气孔器和刺毛等组成，但各类细胞在叶面的出现与分布情形不一致。沟稃草属脉间长细胞长菱形，细胞壁边缘平直，脉间短细胞单生或与刺细胞并生，脉上硅细胞结节形，气孔副卫细胞平行形，脉上及脉间刺细胞常见。根据叶表皮微形态特征，沟稃草属可能与早熟禾族早熟禾属植物亲缘关系较近，与广义拂子茅属、剪股颖族和燕麦族等的亲缘关系较远，叶表皮微形态证据支持将沟稃草属置于早熟禾族。