JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03): 57-64.doi: 10.3969/j.issn.1000-2006.201604035

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The variation in chlorophyll content and fluorescence parameters of Taxus wallichiana var. mairei breeding parents from different locations

XIAO Yao1, 2, ZHANG Rui1*, LIU Jianhui3, LIANG Shuo3, ZHOU Zhichun1   

  1. 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Key Laboratory of Zhejiang Province Forestry Breeding Technology Research, Hangzhou 311400, China;
    2. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China;
    3. Lishui Agriculture Science Academy of Zhejiang Province, Lishui 323000, China;
  • Online:2017-06-18 Published:2017-06-18

Abstract: 【Objective】 The objective of this study was to accurately select excellent cross breeding parents of Taxus wallichiana var. mairei and efficiently conduct hybrid breeding tests. 【Method】 In this paper, growth traits and chlorophyll content of parents were measured and fluorescence parameters were investigated by IMAGING-PAM. Differences in growth characters, chlorophyll content and chlorophyll fluorescence parameters of female and male parents from 30 locations were analyzed. 【Result】 The height, chlorophyll content, and chlorophyll fluorescence parameters of breeding parents were significantly different among locations, but only Y(Ⅱ), Y(NPQ), qP and Fv/Fm were significantly different between genders. The coefficient of variation of growth traits was more than 15%. The energy efficiency of female and male PSⅡ reaction centers were compared and Y(Ⅱ), qP and Fv/Fm of females were 11.30%, 4.28% and 4.11% higher than those of males, respectively. However, the male Y(NPQ)was significantly higher(12.95%)than that of the females. Regarding light energy allocation mode, 41% light energy was used in the photochemical reaction in females, and 37% in males. The Euclidean distance was eight, and breeding parents were divided into four groups based on phenotypic traits. The phenotypic traits of breeding parents from group I were medium, but photosynthetic efficiency of PSⅡ was substantial. The phenotypic traits and PSⅡ photosynthetic efficiency of group Ⅱ were the worst, whereas group Ⅲ phenotypic traits and photosynthetic efficiency were better, and the phenotypic traits and PSⅡ photosynthetic efficiency of the last group were excellent. 【Conclusion】 The growth traits of the females were lower than those of males, but the photosynthetic efficiency of their PSII reaction centers was higher than that of males. This may be related to greater reproductive costs in females. On the other hand, the growth traits of breeding parents were very good, and the fluorescence parameters that represent photosynthetic efficiency of PSII were higher. This indicated that chlorophyll fluorescence parameters could reflect the growth status of the parents to some degree.

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