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Zhao X.-Y.,Chinese Academy of Forestry | Zhao X.-Y.,Beijing Forestry University | Wang J.-H.,Chinese Academy of Forestry | Zhang J.-F.,Beijing Forestry University | And 5 more authors.
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2012

To find the variation characteristics of chlorophyll fluorescence and growth traits of Catalpa bungei clones, 29 clones of C. bungei were taken in the research and 11 profiles of the clones were measured and analyzed, including tree height (H), basic diameter (BD), diameter of breast height (DBH), space between burls (SBB), leaf length (LL), leaf width (LW), leaf area (LA), stipe length (SL), fresh leaf mass per area(Flma), leaf mass per area (Lma), and parameters of chlorophyll fluorescence (F v/F m). The results showed that the curve of diurnal variation of F v/F m shaped "V", reflecting the self-protection mechanisms and variation of solar energy utilization efficiency of C. bungei clones. The average of H, BD, DBH, Flma, Lma and F v/F m of C. bungei clones were 4.58 m, 50.98 cm, 39.31 cm, 0.042 g/cm 2, 0.014 g/cm 2 and 0.836 respectively. The averages of LL, LW and SL all exceeded 20.00 cm, indicating that the leaves of C. bungei clones were much bigger. The analysis of variance showed that there was a remarkable difference in 11 characteristics among the clones (sig < 0.001). Seven coefficients of variation of phenotype were more than 10%, coefficient of genetic variation was closely to that of phenotype variation. The repeatability of 10 in 11 indices was higher than 0.800, indicating that C. bungei clone variation was strongly controlled by genetic factors. The results of phenotypic correlation showed that there were significant correlations among the growth target. Principal component analysis showed that the cumulative contribution rate of initial three principal components of the 11 characteristics in C. bungei clones was 71.23%. The contribution rate of the first principal components Y 1 were the highest (35.92%), including H, BD, DBH, etc.; the second ones F 2 were the trait such as Flma, Lma and F v/F m, and the third ones F 3 were about LL and LW, etc. Based on the analysis of colligate evaluated, 2-2, 008-1, 2-8, 9-1, 1-1 and 4001 were selected as excellent clones when the selection rate was 20%. The genetic gains of three clones on H, DBH were 11.23% and 9. 58%. Remarkable difference in characteristics of biomass and chlorophyll fluorescence can provide basis for future research in C. bungei.

Ouyang F.-Q.,National Engineering Laboratory for Tree Breeding | Ouyang F.-Q.,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education | Ouyang F.-Q.,Tree and Ornamental Plant Breeding and Biotechnology Laboratory of State Forestry Administration | Ouyang F.-Q.,Beijing Forestry University | And 9 more authors.
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2010

To understand the seedling trait performance from different black spruce (Picea mariana) provenances with varied light treatments and to establish efficient propagation technique system with supplemental light, container seedlings of 10 black spruce provenances from Canada were treated by 3 light sources of fluorescent lamp, sunlight dysprosium lamp and tungsten lamp. The results showed that light treatment could inhibit seedling dormancy and promote sustaining growth. The seedling height by using fluorescent light for 8 hrs at midnight for 135 days could be up to 5.47 times compared with control. The effect of light sources was significant on seedling growth, shoot and root formation. The treatment for sunlight dysprosium lamps was best, and fluorescent lamp was more economical and convenient. Besides, the seedling grew well when fluorescent lamp was supplemented for 8 hrs at midnight. There were significant interaction effects on seedling traits between light sources and provenances. It was indicated that there were obvious differences for different black spruce provenances in adapting to light environment. Therefore, it should be paid more attention to select appropriate provenances for introduction experiment. The light source should be selected according to the seedling provenances to achieve the optimum breeding results.

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