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茶树种内变异有各种分类,一致的是分为高杆或半高杆的阿萨姆大叶种和矮杆的中国小叶种两大类。阿萨姆种和中国种的变种间最大差异是耐寒性、树形大小及制茶品质。利用远离原产地的生态各不相同的两变种间杂交可培育出耐寒、制茶品质良好的新品种。日本自30年代半期开始这种杂交育种、中途因第二次世界大战停顿几年,到现在为
Varieties within the species of tea have a variety of categories, the same is divided into high-bar or semi-bar of Assam large-leaved and short bar Chinese leaflet two categories. The biggest difference between Assam species and Chinese species is tolerance to cold, tree size and tea quality. The use of far away from the ecologically different origin of the cross between the two varieties can be cultivated to cold hardy, good tea quality new varieties. Since the beginning of this hybrid breeding in Japan in the mid-1930s, halfway through the years since the Second World War and to the present