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基于形态鉴定及叶片解剖结构对云南白莺山古茶树资源的聚类分析
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摘要
对云南白莺山地区12种类型古茶树资源共60份材料进行形态及叶片解剖结构研究,在此基础上,构建系统聚类图分析这12类茶树的亲缘关系,旨在为今后深入研究白莺山古茶树资源的起源与演化、加快珍稀古茶树资源的开发利用提供形态学和细胞学的参考依据。研究结果表明,12类古茶树可分为两大类和四小类,野生型的本山茶与3个半野生型的黑条子茶、二嘎子茶和大叶本山白芽口茶归为第Ⅰ类,为乔木或小乔木,树型高大,芽叶茸毛无或稀少,叶片大,角质层较厚,栅栏细胞1层,石细胞多且粗大;其他8个类型归为第Ⅱ类,其中4个栽培类型包括勐库大叶茶、勐库小叶茶、白芽子茶和豆蔑茶归为第Ⅱ-a类,为小乔木或灌木,芽叶茸毛较多,叶片栅栏细胞1-2层,石细胞少且小;柳叶茶、贺庆茶、藤子茶3个半野生类型资源归为第Ⅱ-b类,为灌木,树型开张,芽叶茸毛中等,中叶,具有1-2层栅栏细胞,石细胞少且小;红芽茶单独成第Ⅱ-c类,为半野生型灌木,芽叶呈鲜艳紫红色,大叶,石细胞形态和大小多样。
In this study,the morphology and leaf anatomical structure of 12 kinds of ancient tea plants including 60 germplasms were identified and analyzed.On this base,a dendrogram of these ancient tea plants was established and genetic relationship among them was analyzed,which would provide morphological and cytological evidences for lucubrating their origination and evolution,as well as accelerating their development and utilization.The results indicate that,12 kinds of gemplasms are clustered into two main groups and four subclasses.Group Ⅰ consists of one wild type( Benshan) and three semi-wild types( Heitiaozi,Ergazi and Dayebenshanbaiyakou),which are tall arbors or semi-arbors with absent or sparse young shoot pubescences,large leaves,thicker cuticles,one lay of palisade cells,and many bulky sclereids.Four cultivated types( Menkudaye,Menkuxiaoye,Baiyazi and Doumie) belong to group Ⅱ-a,which are semi-arbors or shrubs with denser young shoot pubescences,one to two layers of palisade cells,as well as few small sclereids.Three semi-wild types( Liuye,Heqing and Tengzi) are classed into group Ⅱ-b,which are horizontal spreading shrubs with medium young shoot pubescences,medium leaves,one to two layers of palisade cells,and few small sclereids.Group Ⅱ-c has only one member,Hongya,which is semi-wild shrub with bright reddish violet young shoots,large leaves,and diversifying sclereids in morphology and size.
引文
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