石蒜属12种植物叶片比较解剖学研究

Comparative Anatomy of Leaves in 12 Species of Lycoris (Amaryllidaceae)

对石蒜属(Lycoris Herb.)12种植物叶片的比较解剖学研究表明:(1)石蒜属植物叶片横切面的端部、中部及基部的轮廓基本呈浅“W”或“V”字型,有些种的表皮细胞上具有明显的尖刺状乳突;(2)石蒜属植物均为异面叶,叶肉组织有一定的栅栏组织和海绵组织分化,但二者的厚度、叶肉中所占比例及栅栏组织的细胞层数在种间有一定的差异;(3)海绵组织发达、具有大而明显的薄壁细胞或细胞裂溶后形成空腔(分泌腔或气腔);(4)叶片中维管束数目大多为奇数,叶脉维管束鞘由薄壁细胞组成;(5)石蒜属植物横切面上叶缘的形状分为圆弧形和楔形两种类型。石蒜属植物叶的解剖结构具有许多相似特征;同时又具有一定的种间差异,可为石蒜属植物的种间关系和开发利用提供有价值的信息。

The comparative anatomy of the leaves of 12 species in Lycoris was studied. The results are as follows： （ 1 ） The shape of these foliar transection in Lycoris is basically shallow ＂W＂ or ＂V＂, and there are many spiny papillae on epidermal cells of some species： （2） All these species possess dorsi-ventral leaves. The mesophyll is differentiated into the palisade parenchyma and the spongy parenchyma, many differences between both of them, such as the thickness; of the palisade parenchyma and the spongy parenchyma, the proportion of them and even the cell layers of palisade parenchyma, are occured among species; （3） The spongy parenchyma is developed and possesses abundant big parenchymatous cells or hollow cavities （ secretory canals or air cavities） ; （4） The number of the vascular bundle is usually odd, and the vascular bundle sheath is composed of parenchyma cells; （5） The shape of leaf margin in transverse section can he divided into areuate and cuneate. Many characters of foliar anatomy have a lot in common in the genus Lye, otis, but there me some differenees among species, which can provide valuable information for studies on interspecific relationship and further utilization.