Comparison and early selection of new clones in <Emphasis Type="Italic">Populus tomentosa</Emphasis> |
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| Authors: | Zi-hui Zhang Ze-liang Wang Shan-zhi Lin Zhi-yi Zhang |
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| Institution: | (1) Forest-fire Forecast, Watching and Information Management Center, State Forestry Administration, Beijing, 100714, P. R. China;(2) Key Laboratory for Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education, Beijing Forestry University, Beijing, 100083, P. R. China |
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| Abstract: | In our study, two experimental plantations, respectively, with 24 and 32 new clones of P. tomentosa, were established in Weixian County, Hebei Province and Wuzhi County, Henan Province using a completely randomized block
design. A comparative study was conducted on the continuous 5-year-old height and diameter at breast height (DBH) of new clones
in the two plantations. As well, based on genetic correlation over the years of testing of these clones, a preliminary study
of early selection was carried out. Results indicate that the growth traits of the new clones in Weixian were better than
those in Wuzhi. The traits show weak correlation between the two plantations. In some stands, the height, DBH and seedling
volume of 5-year-old clones presented statistically significant differences among clones. In both plantations, the new clones
showed over 0.6 repeatability of height, DBH and volume, as well as larger coefficients of variation (CV). The fact that these
clones achieved the largest repeatability and CV in the second year suggests that these traits are highly controlled by heredity.
Thus, based on the growth traits of the second year, the new clones B305, B307, B303, H75, BT18, BT17 and 21J-1 were considered
suitable in Weixian. In Wuzhi, the new clones had variable repeatability and CVs in various years and their correlation of
growth traits among different years was not high. We conclude that early selection of new clones was not feasible in Wuzhi. |
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| Keywords: | Populus tomentosa Carr new clones comparative test early selection |
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