The Genome of Black Cottonwood, Populus trichocarpa (Torr. & Gray)
Abstract
We report the draft genome of the black cottonwood tree, Populus trichocarpa. Integration of shotgun sequence assembly with genetic mapping enabled chromosome-scale reconstruction of the genome. More than 45,000 putative protein-coding genes were identified. Analysis of the assembled genome revealed a whole-genome duplication event; about 8000 pairs of duplicated genes from that event survived in the Populus genome. A second, older duplication event is indistinguishably coincident with the divergence of the Populus and Arabidopsis lineages. Nucleotide substitution, tandem gene duplication, and gross chromosomal rearrangement appear to proceed substantially more slowly in Populus than in Arabidopsis. Populus has more protein-coding genes than Arabidopsis, ranging on average from 1.4 to 1.6 putative Populus homologs for each Arabidopsis gene. However, the relative frequency of protein domains in the two genomes is similar. Overrepresented exceptions in Populus include genes associated with lignocellulosic wall biosynthesis, meristem development, disease resistance, and metabolite transport.
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We thank the U.S. Department of Energy, Office of Science for supporting the sequencing and assembly portion of this study; Genome Canada and the Province of British Columbia for providing support for the BAC end, BAC genotyping, and full-length cDNA portions of this study; the Umeå University and the Royal Technological Institute (KTH) in Stockholm for supporting the EST assembly and annotation portion of this study; the membership of the International Populus Genome Consortium for supplying genetic and genomics resources used in the assembly and annotation of the genome; the NSF Plant Genome Program for supporting the development of Web-based tools; T. H. D. Bradshaw and R. Stettler for input and reviews on draft copies of the manuscript; J. M. Tuskan for guidance and input during the analysis and writing of the manuscript; and the anonymous reviewers who provided critical input and recommendations on the manuscript. GenBank Accession Number: AARH00000000.
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Science
Volume 313 | Issue 5793
15 September 2006
15 September 2006
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American Association for the Advancement of Science.
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Received: 13 April 2006
Accepted: 9 August 2006
Published in print: 15 September 2006
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