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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (5): 1464-1472.doi: 10.13287/j.1001-9332.201705.039

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Analysis and comprehensive evaluation on cold resistance of six varieties of Michelia

LI Rui-xue1,2, JIN Xiao-ling1*, HU Xi-jun1,3,CHAI Yi-xia1, CAI Meng-ying1, LUO Feng1, ZHANG Fang-jing1   

  1. 1Central South University of Forestry and Technology, Changsha 410014;
    2Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
    3Research Centre of Development and Utilization Technology of Environment Plant Resources in Hunan Province, Changsha 410014
  • Received:2016-10-14 Revised:2017-03-17 Published:2017-05-18
  • Contact: *E-mail: jxl0716@hotmail.com
  • Supported by:
    This work was supported by the Special Scientific Research Program in Public Industry (Forestry) (201404710), and the Key Project (Landscape Architecture) of Hunan Pro-vince during Twelfth Five-year Period Plan [Educational Commission of Hunan Province 2011(76)].

Abstract: Taking six varieties of Michelia as test materials, their responses under cold situation in the field were investigated and the semilethal low temperatures were calculated by fitting Logistic equation. The nine structure indexes of leaf tissue were observed by paraffin section, and a comprehensive evaluation on cold resistance of different varieties was given according to subordinate function value analysis. The results showed that the relative electrical conductivity of six varieties of Michelia was significantly positively correlated with the semilethal low temperature (LT50) of 3 h 0-25 ℃ treatment. From high to low, the order of LT50, which ranged between -20.48 ℃and -8.67 ℃, was M. maudiae > M. maudiae var. rubicunda > M. wilsonii > M. ‘liubanhanxiao’ ♀× M. shiluensis ♂ > M. platypetala > M. ‘liubanhanxiao’. The epidermal anticlinal walls of six varieties of Michelia leaves had 1-2 layers and showed slightly sinuated shape. The leaf had 1-3 layers of palisade tissue cells and the differences among the indexes of nine anatomical structures were extremely significant. The thickness of palisade tissue, ratio between palisade tissue and spongy tissue, and thickness of the vein were the key factors affecting cold resistance. The order of cold resistance of six varieties of Michelia, from the strong to the weak, was M. ‘liubanhanxiao’ > M. platypetala > M. ‘liubanhanxiao’ ♀× M. shiluensis ♂>M. wilsonii > M. maudiae var. rubicundaM. maudiae, which was basically consistent with the result of field investigation.