Abstract
Papaya, a fruit crop cultivated in tropical and subtropical regions, is known for its nutritional benefits and medicinal applications. Here we report a 3× draft genome sequence of 'SunUp' papaya, the first commercial virus-resistant transgenic fruit tree to be sequenced. The papaya genome is three times the size of the Arabidopsis genome, but contains fewer genes, including significantly fewer disease-resistance gene analogues. Comparison of the five sequenced genomes suggests a minimal angiosperm gene set of 13,311. A lack of recent genome duplication, atypical of other angiosperm genomes sequenced so far, may account for the smaller papaya gene number in most functional groups. Nonetheless, striking amplifications in gene number within particular functional groups suggest roles in the evolution of tree-like habit, deposition and remobilization of starch reserves, attraction of seed dispersal agents, and adaptation to tropical daylengths. Transgenesis at three locations is closely associated with chloroplast insertions into the nuclear genome, and with topoisomerase I recognition sites. Papaya offers numerous advantages as a system for fruit-tree functional genomics, and this draft genome sequence provides the foundation for revealing the basis of Carica's distinguishing morpho-physiological, medicinal and nutritional properties.
Original language | English (US) |
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Pages (from-to) | 991-996 |
Number of pages | 6 |
Journal | Nature |
Volume | 452 |
Issue number | 7190 |
DOIs | |
State | Published - Apr 24 2008 |
Externally published | Yes |
Funding
Acknowledgements We thank X. Wan, J. Saito and A. Young at the University of Hawaii for technical assistance; C. Detter at the DOE Joint Genome Institute; F. MacKenzie, O. Veatch and T. Uhm at the Hawaii Agriculture Research Center; L. Li, W. Teng, Y. Wu, Y. Yang, C. Zhou, N. Wang, P. Wang and D. Fei at the Tianjin Biochip Corporation, Tianjin Economic-Technological Development Area, Tianjin; and R. Herdes, L. Diebold, R. Kim, A. Hernandez, S. Ali and L. Bynum at the University of Illinois at Urbana-Champaign. This papaya genome-sequencing project was given support by the University of Hawaii and the US Department of Defense grant number W81XWH0520013 to M.A., the Maui High Performance Computing Center to M.A., the Hawaii Agriculture Research Center to R.M. and Q.Y., and Nankai University, China, to L.W. Other support to the papaya genome project included the United States Department of Agriculture T-STAR program; a United States Department of Agriculture\u2013Agricultural Research Service cooperative agreement (CA 58-3020-8-134) with the Hawaii Agriculture Research Center; the University of Illinois; the National Science Foundation Plant Genome Research Program; and Tianjin Municipal Special Fund for Science and Technology Innovation Grant 05FZZDSH00800. We thank P. Englert, former chancellor of the University of Hawaii, for initial infrastructure support of the research.
ASJC Scopus subject areas
- General