芭蕉芋叶片结构特征及其与抗旱性的关系

运用石蜡切片法和指甲油印迹法,对3个芭蕉芋品种的叶片解剖结构——叶片厚度、叶肉厚度、上表皮厚度、下表皮厚度、气孔密度、气孔长度及宽度、长细胞长度及宽度、短细胞长度及宽度等10项相关指标进行测定,分析芭蕉芋抗旱性与叶片结构之间的关系。结果表明:(1)芭蕉芋的表皮结构与抗旱性有一定的关系,表现为抗旱性强的品种气孔密度大,且长、短细胞体积小、排列紧密。(2)芭蕉芋叶片、叶肉、上下表皮厚度与抗旱性关系在不同品种间差异不显著。(3)芭蕉芋叶肉及上、下表皮占叶片横切面的比例与抗旱性存在显著相关关系。(4)芭蕉芋叶片保水能力与叶肉比例呈极显著负相关关系,与上表皮比例呈极显著正相关关系。

Leaf Structure Characteristics of Canna edulis and Its Relationship with Drought Resistance

The leaf anatomical structures in terms of xeromorphic indices of the three species of Canna edulis including thickness of leaves, thickness of mesophyll, thickness of upper and lower epidermis, stoma density, stoma length and width, length and width of long cells, length and width of short cells were measured. Difference analysis and comprehensive evaluation of the drought resistance of C. edulis were carried out by analysis of variance and related analysis methods, and the relationship between drought resistance and leaf structure was explored. The results showed that: (1) the epidermal structure of C. edulis had a certain relationship with drought resistance, and the varieties with strong drought resistance had large stomatal density, and the long and short cells were small in size and closely arranged. (2) The relationship between the thickness of the leaves, mesophyll and epidermis of the C. edulis was not significantly different among different varieties. (3) There was a significant correlation between the ratio of the C. edulis leaf and the upper and lower epidermis to the cross section of the leaves and drought resistance. (4) The water retention capacity of the leaves of C. edulis had a significant negative correlation with the thickness of the mesophyll and a significant positive correlation with the thickness of the upper epidermis.