Variation analysis of seed and seedling traits of cross combination progenies in Populus |
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| Authors: | Li Shan-wen Zhang Zhiyi He Cheng-zhong An Xin-min Yu Zhi-shui and Li Bai-lian |
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| Institution: | (1) Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing Forestry University, 100083 Beijing, P. R. China;(2) Department of Forestry and Environmental Resources, North Carolina State University, 27695 Raleigh, NC, USA;(3) Present address: Shandong Academy of Forestry, 250014 Jinan, P. R. China |
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| Abstract: | Twenty-five species and hybrids in Populus were used as parents, and 26 cross combinations, including more than 5 000 seedlings, were obtained by artificial cross breeding.
The length of infructescence, number of seeds per infructescence, thousand-seed weight, germination rate of seeds among these
cross combinations were tested. The results indicated that the cross combinational effects were significant for these traits,
and demonstrated that the length of infructescence, thousand-seed weight were positively affected by female parent. In addition,
seedling height, diameter above ground, diameter at breast height (DBH) of 17 cross combination progenies were investigated.
The analysis of mean and standard deviation of these three traits showed that seedling height, diameter above ground, DBH
had extensive variation among combinations and individuals within combination. Variance analysis and estimate of heritability
indicated that the three traits had wide variation and were controlled by heredity. It was feasible to select superior cross
combinations and seedlings. Further more, the result of multiple comparison showed that P. deltoides ‘Lux’ × P. deltoides ‘D324’, P. ussuriensis cl. ‘U4’ × P. deltoides ‘T66’, P. ussuriensis cl. ‘U4’ × P. deltoides ‘T26’, P. deltoides ‘Lux’ × P. ussuriensis cl. ‘U3’, (P. tomentosa × P. bolleana) × (P. alba × P. glandulosa), (P. alba × P. tomentosa) × (P. alba × P. glandulosa), and (P. alba × P. glandulosa ‘No. 2’) × P. tomentosa ‘Lumao 50’ were superior cross combinations with higher growth rate. Finally, 123 elite seedlings were selected for further
test.
Supported by the Doctoral Foundation of Ministry of Education (Grant No. 200220022004) and the National “863” Project (Grant
No. 2002AA241071)] |
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| Keywords: | poplar cross combination hybrid variation analysis |
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