绿萝营养器官解剖结构
毕业论文关键词：绿萝；营养器官；解剖结构；抗旱性；耐阴性
Study on Anatomical Structures of Vegetative Organs of Epipremnum aureum
Abstract: This paper discussed the anatomical structures of vegetative organs, which includes roots and stems and leaves of Epipremnum aureum，with the light microscope by using paraffin method.The results were as follows. The roots of Epipremnum aureum was composed of epidermis, periderm, cortex and vascular cylinder. The epidermis was composed of monolayer cells. Periderm was not obvious. Cortex accounted for about 3/4 of the transverse section radius. The number of primary xylem ridge in vascular cylinder was polyarch. Metaxylem catheter orifice was larger. Stem was composed of epidermis, cortex and vascular cylinder.Epidermis of stems epidermis was multi-epidermis. Cortex was thick and contained a small amount of scattered vascular bundles.There were no pith in vascular cylinder.There were chloroplast in the multilayer cells close to the epidermal layer,around the atactostele in cortex and in the vascular cylinder. The petiole was composed of epidermis,ground tissue and vascular bundle. The epidermis of petiole epidermis was multi-epidermis.There were scattered vascular bundles in ground tissue and there were chloroplast around the vascular bundles.There were differentiation of palisade tissue and spongy tissue in leaves.There were paracytic type stomatal apparatus just in the epidermis.The upper epidermis cells were obvious larger than the lower epidermis.These characteristics may be related to drought resistance that stems and petioles were multi-epidermis,the upper epidermis cells were large,there were paracytic type stomatal apparatus just in the epidermis.The following characteristic may be associated with the shade tolerance:there were chloroplast in the multilayer cells close to the epidermal layer,around the atactostele in cortex and in the vascular cylinder.It was very rare that cortex of stems contained a small amount of scattered vascular bundles.
Key words: Epipremnum aureum; Vegetative organs; Anatomical structure; Drought resistance;Shade tolerance
目录
引言 1
1 材料与方法 2
1.1供试材料 2
1.2实验方法 2
2 结果与分析 2
2.1根 3
2.2茎 3
2.3叶 3
3 讨论
致谢 8
参考文献 8
引言
绿萝（Epipremnum aureum）又名黄金葛,是天南星科(Araceae)的常绿藤本植物，喜湿热环境，喜富含腐殖质的微酸性土壤，阴性植物，忌阳光直射 [1]。绿萝叶片翠绿，气根发达，缠绕性强，生命力顽强，遇水即活，是比较大众化的优良室内盆栽。绿萝有许多种类，本实验采用的是青叶绿萝，与其他种类相比，青叶绿萝最显著的特征是叶子全部为青绿色，没有花纹和杂色，便于实验观察。
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