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Zhao X.,Northeast Forestry University | Li Y.,Northeast Forestry University | Zheng M.,Northeast Forestry University | Bian X.,Northeast Forestry University | And 8 more authors.
PLoS ONE | Year: 2015

To evaluate differences among poplar clones of various ploidies, 12 hybrid poplar clones (P. simonii × P. nigra) × (P. nigra × P. simonii) with different ploidies were used to study phenotypic variation in growth traits and photosynthetic characteristics. Analysis of variance showed remarkable differences for each of the investigated traits among these clones (P < 0.01). Coefficients of phenotypic variation (PCV) ranged from 2.38% to 56.71%, and repeatability ranged from 0.656 to 0.987. The Pn (photosynthetic rate) photosynthetic photon flux density (PPFD) curves of the 12 clones were S-shaped, but the Pn-ambient CO2 (Ca) curves were shaped like an inverted "V". The stomatal conductance (Gs)-PPFD and transpiration rate (Tr)-PPFD curves had an upward tendency; however, with increasing PFFD, the intercellular CO 2 concentration (Ci)-PPFD curves had a downward tendency in all of the clones. The Pn-PPFD and Pn-Ca curves followed the pattern of a quadratic equation. The average light saturation point and light compensation point of the triploid clones were the highest and lowest, respectively, among the three types of clones. For Pn-Ca curves, diploid clones had a higher average CO2 saturation point and average CO2 compensation point compared with triploid and tetraploid clones. Correlation analyses indicated that all investigated traits were strongly correlated with each other. In future studies, molecular methods should be used to analyze poplar clones of different ploidies to improve our understanding of the growth and development mechanisms of polyploidy. Copyright:© 2015 Zhao et al. Source

Zhao X.,Northeast Forestry University | Wang C.,Northeast Forestry University | Li S.,Tree Seedling Management Station | Hou W.,State University of New York at Stony Brook | And 6 more authors.
Journal of Forestry Research | Year: 2014

Siberian Pine (Pinus sibirica) is an ecologically and economically important species in pristine forests throughout northern Russia. Four provenances of P. sibirica were introduced from Mongolia and Russia to the Greater Xing'an Range (the Daxing'anling), northeast China in 1993. The aim of this research was to study genetic variation and selection of the introduced four Pinus sibirica provenances. Heights (H), basal diameters (BD), survival rates (SR) and crown lengths (CL) of different families were measured as primary outcomes in different growth years. Results of data analyses demonstrated high coefficients of phenotypic variation (PCV) and heritability (H 2) for H, BD and CL at 18 years after introduction. PCV and H 2 increased with age. Correlations of growth traits between any two growth years were all significantly positive, but the correlation coefficient was smaller when the growth year interval was larger. Correlations between H and the original environment factors decreased gradually, indicating that with long-term subsistence in the new environment, the influence of the source environment declined. Colligation of multiple traits to estimate provenances showed that Novosibirsk, Tomsk, and Altai Mountains had higher survival rates and biomass, and proved more suitable for introduction and plantation in the Greater Xing'an Range in China. © 2014 Northeast Forestry University and Springer-Verlag Berlin Heidelberg. Source

Liu M.,Northeast Forestry University | Yin S.,Northeast Forestry University | Si D.,Northeast Forestry University | Shao L.,Northeast Forestry University | And 6 more authors.
Euphytica | Year: 2015

Scientists have widely applied transgenic technology to plants. We transferred the TaLEA gene to Populus simonii × P. nigra (Xiaohei Poplar), obtained ten transgenic poplar clones and analyzed these clones in a greenhouse and woodland. The heights (H), basal diameters (BD), and diameter at breast high (DBH) were significantly different (P < 0.01) among the 11 test clones (the ten above and one non-transgenic clone, the control). Trees from the Xinhua site, that had low soil pH and conductivity, showed the largest H and DBH. Clone XL-1 showed the highest H, BD and DBH among the test 11 clones for 1-year-old or 3-years-old trees. The phenotypic coefficient of variation and repeatability (R) of all the traits ranged from 19.33 to 41.22 % and 0.772 to 0.965, respectively. AMMI analysis results showed that genotype (G), environment (E) and G × E interaction were highly significantly correlated (P < 0.01). Stability analysis indicated some clones that produced tall or average trees were sensitive to or resistant to adverse environmental conditions, respectively. These results suggested that the number of copies of TaLEA gene or the different integration site of each clone were not exactly same, resulting in a variety of genetic and phenotype effects. The research can provide theoretical basis for tree genetic in saline. © 2015 Springer Science+Business Media Dordrecht Source

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