番荔枝科蚁花属和澄广花属叶的比较解剖学研究

Comparative Anatomy on Leaves of Mezzettiopsis and Orophea (Annonaceae)

利用扫描电镜技术、叶片离析方法和石蜡切片法对蚁花属 1种和澄广花属 9种植物叶的形态结构进行比较研究。结果表明 ,两属植物有许多相似之处 ,但又有以下一些显著不同 :蚁花属植物叶表皮细胞均具一晶簇 ,叶肉组织中具 1～ 2层栅栏组织细胞 ,油细胞均匀分布在栅栏组织和海绵组织中 ,栅栏组织在主脉处不连续 ,而澄广花属植物叶的表皮细胞内具一单斜晶 ,叶肉组织中具 1层栅栏组织细胞 ,油细胞仅分布在海绵组织中 ,栅栏组织在主脉处连续。结果为蚁花属和澄广花属的分类学处理提供了新证据。

The leaf form and structure of 1 Mezzettiopsis species and 9 Orophea species were comparatively studied with the help of scanning electron microscope, epidermal maceration and paraffin section method. The results showed that there were three major anatomical differences between Mezzettiopsis and Orophea.In the leaf of Mezzettiopsis, each epidermal cell contained one cluster crystal, mesophyll tissue had one or two layer palisade tissue cells, oil cells were evenly distributed in the palisade and spongy tissue, and palisade tissue were non-contiguous in the leaf midrib. In leaves of Orophea, however, all most epidermal cells contained one oblique crystal, mesophyll tissue had one layer palisade tissue cells, oil cells were only distributed in the spongy tissue, and palisade tissue were contiguous in the leaf midribs. Therefore, the results mentioned above supported the viewpoint that Mezzettiopsis and Orophea were two distinct genera.