| Cross Breeding of Populus and Its Hybrids for Cold Resistance |
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| 作者单位： | Zhang Dong-fang Zhang Zhi-yi* Zhu Zhi-ti Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants，Ministry of Education，Beijing Forestry University，Beijing，100083，P. R. China |
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| 基金项目： | Suppoited by the Doctoral Foundation of Ministry of Education （Grant No.200220022004） and the National ＂863＂ Project （Grant No.2002AA241071） |
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| 摘 要： | Populus tomento a was crossed with P. tremuloidis, P grandiden ata, P. lba × P. grandidentata and P. alba × Ulmus s . ta pumila in order to maintain its rapid growth and high wood quality and improve its resistance to cold. Two methods were used to increase the germination rate from 1.5% to 41.1% and the remaining rate from 1.7% to 44.2%. Forty crossing combinations were conducted and 2 744 hybrid seedlings were obtained. MX. t4 × P grandiden ata (G-1-58), MX3 × P. tremuloidis (T-44-60), MX2 × P. tremuloidis (l-13-87-37) and MX2 × (P. alba × P. grandidentata) were regarded as superior combinations after analysis and selection. Thirty seedlings of these combinations and 11 triploid seedlings identified by counting their chromosomes were selected as super plants.
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| 关 键 词： | 白杨树 抗寒性 杂交优势 种质资源 染色体 |
Cross Breeding of Populus and Its Hybrids for Cold Resistance |
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| Authors: | Zhang Dong-fang Zhang Zhi-yi Zhu Zhi-ti |
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| Institution: | Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing Forestry University, Beijing, 100083, P. R. China |
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| Abstract: | Populus tomentosa was crossed with P. tremuloidis, P. grandidentata, P. alba × P. grandidentata and P. alba × Ulmus pumila in order to maintain its rapid growth and high wood quality and improve its resistance to cold. Two methods were used to increase the germination rate from 1.5% to 41.1% and the remaining rate from 1.7% to 44.2%. Forty crossing combinations were conducted and 2 744 hybrid seedlings were obtained. MX4 × P. grandidentata (G-1-58), MX3 × P. tremuloidis (T-44-60), MX2 × P. tremuloidis (l-13-87-37) and MX2 × (P. alba × P. grandidentata) were regarded as superior combinations after analysis and selection. Thirty seedlings of these combinations and 11 triploid seedlings identified by counting their chromosomes were selected as super plants. |
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| Keywords: | Populus tomentosa cross breeding embryo abortion in vitro embryo culture polyploid cold resistance |
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