Abstract: The DNA fragments of noncoding sequences of the chloroplast trnLF were obtained by sequence specific PCR amplification for 26 samples, collected from 17 species or hybrids from four sections in Populus. The PCR products were isolated, purified and ligated to pGEMT. Ligated products were transformed to Escherichia coli with DH5ɑ and positive clones were selected for sequencing.The results show that the length of trnLF sequences ranged from 771 to 811 bp and the percentage of the G +C was 30.6%-31.9%. The sequences were aligned and final sequences were 857 bp in length, which included 46 variable sites and 33 parsiminfo sites. The phylogeny tree was constructed with the nearest neighbor algorithm and UPGMA methods, using Salix viminalis and S. polaris as the outgroup. Results showed that: 1) all samples in the Section Leuce formed a separate clade, while Section Aigeiros, Tacamahaca and Turanga formed another main clade, in which the Section Tacamahaca and Turanga could not be clearly separated; 2) in the Section Tacamahaca, P. szechuanica was independent from the other species of Populus and formed a separate clade, while P. purdomii was clustered with the Section Leuce; 3) Section Aigeiros, Tacamahaca and Turanga were thought to be polyphyletic, except for the Section Leuce.The results provide molecular proof for studying the origin and phylogeny of Populus, which may be of theoretical significance and have potential application in practice. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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