乌龙茶资源农药抗性与叶片形态和解剖特征关系的初步研究

在已筛选出低农药残留量的乌龙茶种质资源的基础上，本试验研究了茶树叶片表面特征、解剖结构与不同品种抗农药残留的关系，初步明确了茶树对农药残留的抗性机制：茶树品种对农药残留的抗性与叶尖形状、角质层同栅栏组织的比值、角质层同海绵组织的比值、上表皮同角质层厚度的比值有较密切关系。低农残的茶树资源具有如下特征：叶尖急尖、角质层同栅栏组织厚度之比低、角质层同海绵组织厚度之比低、上表皮同角质层厚度之比较高；反之为高农残的茶树资源。

Preliminary Research for the Relationship between Pesticide Resistance and Leaf Morphology, Anatomic Characteristics of Oolong Tea Plant Resources

Based on screening germplasm resources of oolong tea plant with low pesticide residue content, the relationship between pesticide resistance and leaf morphology, anatomic characteristics of oolong tea plant resources was studied, and the resistance mechanism of tea plant to pesticide residue was probed into. The result showed that the pesticide resistance of tea plant resouces correlates with leaf tine, ratio of cutin layer/ palisade tissue, ratio of cutin layer/ spongy tissue, ratio of upper epidermis/ cutin layer. The tea plant resources with low pesticide residue content had the characteristics as follows: sharp leaf tine, low ratio of cutin layer to palisade tissue, low ratio of cutin layer to spongy tissue, high ratio of upper epidermis to cutin layer. The tea plant resouces with high pesticide residue content reversed. Key words: Tea plant; Pesticide residue; Resistance mechanism