We acknowledge the Gene Ontology Consortium for software infrastructureand technical support. We thank our two industry collaborators,Monsanto and their Genome Knowledge Enhancement Program, andPioneer Hi-Bred International, Inc., for contributing theirspecies-specific ontologies. We also thank Quentin Cronk, RexNelson, Naama Menda, Victoria Carollo, and William Friedmanfor their participation in ontology development, as well asnumerous researchers and curators who have reviewed the plantontologies and are listed individually online (http://www.plantontology.org/docs/otherdocs/acknowledgment_list.html).
Received November 8, 2006;
accepted November 26, 2006;
published December 1, 2006.
1 This work was supported by the National Science Foundation (grantno. 0321666 to the Plant Ontology Consortium).
2 These authors contributed equally to the development of thePlant Structure Ontology.
3 Present address: Molecular Sciences Institute, Berkeley, CA94704.