茶树品种抗茶橙瘿螨的形态与生化特征

Morphological and Biochemical Parameters of Tea Varieties Resistante to Pink Mite(Acaphylla theae Watt)

不同抗螨性的茶树品种间存在着形态学和生物化学方面的差异。扫描电镜的观测结果表明，抗性品种在叶面形态上具有茸毛密度高、上表皮角质化程度强和气孔密度低的特点。鲜叶生化分析结果表明，抗性品种的氨基酸总量及组成中的茶氨酸、谷氨酸和天冬氨酸含量比感性品种高；此外，抗性品种还有较高的咖啡碱含量、低的还原糖和水溶性糖含量及较高的谷氨酸脱氢酶和苯丙氨酸解氨酶活性的生化特征。从抗螨机制的角度来说，形态学特征主要构成了螨取食行为的障碍因子，受遗传控制；而化学特征为一抗生性机制。

Morphological and biochemical differences were observed among various pink mite resistant varieties.Scanning electron microscopic results showe that the leaves of the rsistant varieties possessed higher density of pubescence,strong cuticularization on the lower surface and lower stoma density.Biochemical analyses showed that the resistant varieties possessed higher contents of total amino acids and theanine,glutamic acid,aspartic acid,coffeine and lower contents of reduced sugar and water soluble sugar.Furthermore,stronger activities of glutamin dehydrogenase and phenyalanine amonia lyase were also observed in the shoots of the resistant varieties.It is suggested that morphological attributes of leaves play inhibitive roles in the process of mite feeding behavior while biochemical parameters show the antibiosis aspect of resistant mechanism to pink mite.