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《Chinese Journal of Tropical Crops》 2012-05
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Mathematic Classification of Some Species in Piper Genus with Morphological Characters

HAO Chaoyun,TAN Lehe,FAN Rui,YANG Jianfeng, YU Huan,WU Huasong,WU Gang Spice and Beverage Research Institute,CATAS,Ministry of Agriculture Key Laboratory of Genetic Resources Utilization of Spice and Beverage Crops,Hainan Provincial Key Laboratory of Genetic Improvement and Quality Regulatioin for Tropical Spice and Beverage Crops,Wanning,Hainan 571533,China  
The mathematic classification of 29 species(including varieties) in Piper genus of China was studied with 32 important morphological characters,including 11 dualistic characters,13 multi-characters and 8 quantitative characters,by using cluster analysis and principal component analysis.The result showed that 9 characters were closely related to others or appeared irregularly,showing that those characters did not play a significant role on the classification of Piper species.The level of morphological characters deviation was low and the contributions of the first several principal components were obviously not big enough as expected.The results showed that deviation of morphological characters might be multi-directional characteristics during the course of evolution and their taxonomic significance in Piper was not as useful as in other plants.The 29 species of Piper were divided into four caboodles by clustering analysis,and each caboodle did not show obvious regional characteristics.
【Key Words】： Piper Mathematic classification Cluster analysis Principal component analyses(PCA)
【Fund】： 公益性(农业)科研专项项目(No.200903024-005);; 农业部热作种质资源保护项目(No.11RZZY-08 12RZZY-13)
【CateGory Index】： S573
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