摘要甘薯（Dioscorea esculenta (Lour.) Burkill）源自中美洲，明朝时期经过多种渠道引入我国。[1]中国作为世界上最大的甘薯种植国家。由于地域广阔等原因，不同地区的环境差异明显,在经过多次改良之后，现在中国甘薯的品种繁多，可以适应不同环境。然而不同品种的甘薯其抗旱性存在很大的差异。研究发现，甘薯的形态、生长势和产量品种的抗旱性之间存在一定的关系。[2]研究甘薯叶表皮细胞微形态与抗旱性的关系，可以了解各品种之间的抗旱差异。以甘薯徐紫2、徐紫3、徐紫5、徐紫6、徐薯13和徐薯22为试材。运用显微摄像对不同甘薯品种叶表皮微形态的观察。其中包括甘薯叶表皮的气孔密度、表皮毛数量、叶表皮细胞面积和细胞形状的记录。再通过测量不同品种甘薯干旱条件下甘薯叶片脯氨酸含量确定其抗旱性。[3]研究发现不同品种的甘薯的叶表皮细胞面积与抗旱性呈正相关（r=0.359）。叶表皮的气孔密度与抗旱性呈正相关（r=0.428）。叶表皮的表皮毛密度与抗旱性较叶表皮细胞面积和气孔密度相关性不明显（r=0.081）。50709

毕业论文关键词：甘薯  叶表皮细胞  气孔  抗旱性

Sweet potato Leaf Epidermal cell morphology and Drought Relations

Abstract

Sweet potato（Dioscorea esculenta (Lour.) Burkill）from Central America, the Ming Dynasty through a variety of channels to introduce our country. [1]China as the world's largest sweet potato（Dioscorea esculenta (Lour.) Burkill） growing country. Due to the vast geographical and other reasons, the environment in different regions is obviously different, after several improvements, the variety of Chinese sweet potato variety, can adapt to different environments. However, the drought resistance of different varieties of sweet potato（Dioscorea esculenta (Lour.) Burkill） is very different. The study found that there was a certain relationship between the morphology, growth potential and drought resistance of sweet potato varieties. [2] study on the relationship between the micro morphology and drought resistance of sweet potato leaf epidermis cells, can understand the difference of drought resistance among different cultivars. With sweet potato Xu Zi 2, Xu Zi 3, Xu Zi 5, Xu Zi 6, Xu 13 and Xu 22 as the test material. Observation on the leaf epidermis morphology of different sweet potato varieties by using microscopic imaging. Which includes the sweet potato leaf epidermis stomatal density, the number of pores, leaf epidermis cell size and cell shape of the record. The drought resistance of sweet potato leaves was determined by measuring the proline content of sweet potato leaves under drought conditions. The study found that the leaf epidermal cell area and drought resistance of different varieties of sweet potato（Dioscorea esculenta (Lour.) Burkill） were positively correlated (r=0.359). The stomatal density of leaf epidermis was positively correlated with drought resistance (r=0.428). The correlation between pore density and drought resistance of leaf epidermis was not obvious (r=0.081).

Key words: sweet potato（Dioscorea esculenta (Lour.) Burkill）    Leaf epidermis cell  stoma  Drought resistance

目  录

摘要 I

Abstract II

目  录 III

1引言 4

2甘薯叶表皮细胞微形态与抗旱性研究 5

2.1材料与方法 5

2.2实验结果与数据记录 6

2.3甘薯叶表皮细胞微形态与抗旱性关系的结果与分析 22

3结论