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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (7): 44-51.doi: 10.11707/j.1001-7488.20140707

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Establishment of an Integrated Assessment System on Cold Resistance of Poplars at the Seedling Stage

Li Xiaoyu, Yang Chengchao, Peng Jiandong, Yang Zhiyan, Zhang Yan   

  1. Liaoning Provincial Research Institute of Poplar Gaizhou 115200
  • Received:2013-08-16 Revised:2013-11-06 Online:2014-07-25 Published:2014-07-04
  • Contact: 杨成超

Abstract:

The germination rate of annual branches of 11 poplar (Populus) clones were used as a judging indicator to investigate the cold resistance after cold hardiness treatment with low-temperature and freezing-thawing at-40℃ for 24 hours and then transferred to 20℃ for 24 hours repeatedly four times. Five parameters, such as relative electric conductivity, relative water content, water saturation deficit, MDA and soluble sugar, were selected by using correlation analysis for studying physiological and biochemical substances, physical characters, growth traits and phenological phases etc. The parameters were highly significantly or significantly correlated to the hardiness. The five parameters were further converted to integrated index by principle component analysis, with the combination of their subordinate functions to establish an assessment system. Integrated index value of cold resistance of each variety was obtained by measuring the weight and its function value. According to composite index, the sequence of cold resistance from strong to weak was P.×xiaohei, P. ×xiaozhuanica ‘Poplar’, P. deltoides ×(P. nigra var. thevestina ×P. nigra), P. simonii, P. ×canadensis ‘N3016’, P. ×canadensis ‘Guariento’, P. ×canadensis ‘Sacran-79’, P. ×deltoides ‘Liaoyu3’, P. ×euramericana ‘97’, P. ×euramericana ‘Zhongliao1’, P. ×euramericana ‘L35’. The result was consistent with the performance in cold resistance of the clones in field. These clones of poplars could be divided into four groups by cluster analysis. The first group, the first 4 clones in the resistance sequence, had the strongest cold resistance. The second group, including the 5-7th in the sequence, had medium cold resistance. The third group, including the 8-10th in the sequence, had relative weak resistance. The last one in the sequence was the worst. The evaluation system provided a technical support to judge the ability of cold resistance of seedlings of different clones, and would be beneficial to others such as breeding for cold resistance, varieties classification.

Key words: poplar, cold resistance, freezing and thawing, integrated assessment, physiological and biochemical indexes

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