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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (10): 1797-1804.doi: 10.3724/SP.J.1006.2008.01797


Comparison and Cluster Analysis of Photosynthetic Characters and Water Use Efficiency in Tea (Camellia sinensis) Cultivars

GUO Chun-Fang12,SUN Yun3,CHEN Chang-Song4,CHEN Rong-Bing4,ZHANG Mu-Qing1*   

  1. 1 Key Laboratory of Eco-physiology and Genetic Improvement for Sugarcane, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian; 2 Fujian Institute of Education, Fuzhou 350025, Fujian; 3 College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian; 4 Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an 355015, Fujian, China
  • Received:2008-02-18 Revised:1900-01-01 Online:2008-10-12 Published:2008-10-12
  • Contact: ZHANG Mu-Qing

Abstract: The importance of carbon input in tea productivity can be appreciated from the fact that 95% of the dry weight of the plant is derived from photosynthesis. Therefore, an increase in net photosynthesis and more efficient partitioning are logical steps for increasing productivity, which was subject to the tea genotypes. The photosynthetic parameters in leaves of 52 tea cultivars were determined under field conditions, and studied by using phenetic classification, principal component, cluster, discrimination analyses. The results showed that there were significant differences (P<0.01) in net photosynthesis rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci), water use efficiency (WUE) among the tested cultivars. The first three principal components were analyzed and their cumulative contribution of variance accounted for 96.98%. Pn, Tr, and Gs were the main factors in the first principal component. WUE and Ci were the main factors in the second and third principal com-ponents respectively. Fifty two tea cultivars were clustered into five groups based on Pn, Tr, Gs, and WUE. The group I including 15 tea cultivars with high photosynthesis rate, medium transpiration rate, lower stomatal resistance and high water use efficiency could be used for improvement of tea cultivars. Then, with discrimination analysis, the parameters of Pn, Tr, Gs, and WUE greatly affecting the classification were selected, and five discrimination models with better distinguishing ability were set up.

Key words: Tea (Camellia sinensis), Photosynthetic characters, Phenetic classification, Cluster analysis

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