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Scientia Silvae Sinicae ›› 2016, Vol. 52 ›› Issue (11): 124-133.doi: 10.11707/j.1001-7488.20161115

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Correlation and Path Analysis of the Components of Fiber Content for Populus×euramericana

Chen Cun, Ding Changjun, Su Xiaohua, Huang Qinjun   

  1. State Key Laboratory of Forest Genetics and Tree Breeding Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration Research Institute of Forestry, CAF Beijing 100091
  • Received:2015-08-25 Revised:2015-11-26 Online:2016-11-25 Published:2016-12-16

Abstract: [Objective] The components and their contribution rate of fiber content of the mini-rotation forestry in poplar were analyzed to lay a solid foundation for its breeding work. [Method] Five clones of Populus×euramericana(‘Guariento’, ‘Lingfeng 1’, ‘Lingfeng 3’, ‘Lingfeng 4’and ‘Lingfeng 5’) were selected from plantation at the age of 3 years, the growth traits, wood property and their correlation were analyzed. The relational model was built based on the single plant fiber content with other traits, and the partial correlation analysis and path analysis were carried out between major factors of the fiber content. In this study, analysis of variance(ANOVA), standard deviation analysis and multiple comparison by LSD were applied in all data of each trait, meanwhile the variation coefficient and repeatability were calculated for five clones. Correlation analysis was carried out among every traits, regression analysis was used to analyze and establish the relational model between the single plant fiber content with growth traits and wood property. The partial correlation analysis and path analysis were applied among major factors of fiber content and the contribution rate of major factors was measured. All analysis were based on the software of Excel and SPSS 17.0.[Result] All growth traits (including height, diameter and individual volume) exhibited a relatively wider variation margin and significant differences among the five clones, and they also had a larger genetic proportion in five clones. As for wood property, except for the single plant fiber content, other traits (including lignin, holocellulose, cellulose, basic density, microfibril angle, fiber average length, fiber average width, fiber length-width ratio and fiber coarseness) had a relatively stable expression. The analysis of growth traits showed significant correlation, however, the growth characters and wood properties had an independent correlation. The relational model indicated that individual volume, cellulose and basic density were significantly correlated with the single plant fiber content. The single plant fiber content was largely affected by individual volume, cellulose and basic density, meanwhile the three factors were interacted with each other, these were consistent with the results obtained from the relational model. The path analysis showed that improving individual volume was the best way to improve single plant fiber content, increasing wood basic density was the second, the effect by improving cellulose was the least. The contribution rate of the three major factors was 72.61%, 13.55% and 13.84%, respectively, which is consistent with the results of partial correlation analysis.[Conclusion] All results showed that the main factors of fiber content in Populus× euramericana included individual volume, cellulose and basic density. At the same time, the results indicated that all growth traits (height, diameter and individual volume) had much room for improvement, and these traits were independent with wood properties. Therefore the growth traits should be taken into account as selection criteria.

Key words: Populus ×, euramericana, fiber content, correlation analysis, regression analysis, path analysis

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