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Links to the most up to date versions of ontology flat files are provided below. Definitions of the terms in all ontologies are contained in respective definition files.  You may wish to download the flat files and view them by using a stand alone ontology editor OBO-Edit

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Trait Ontology (TO)

It is a controlled vocabulary to describe each trait as a distinguishable feature, characteristic, quality or phenotypic feature of a developing or mature individual. Examples are glutinous endosperm, disease resistance, plant height, photosensitivity, male sterility, etc.

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Gene OntologyTM  (GO)

Developed by the Gene Ontology Consortium to help annotate information on gene products (not the genes) using the following three organizing principles of molecular function, biological process and cellular component. Copyright © Gene Ontology Consortium.

  

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Molecular Function: The tasks performed by individual gene products; example is Rubisco
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Biological Process: Broad biological goals, such as photosynthesis or ripening, that are accomplished by ordered assemblies of molecular functions.
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Cellular Component: Subcellular structures, locations, and macromolecular complexes; examples include chloroplast, telomere, vacuole, nucleus, etc. .
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Plant Ontology (PO)

Gramene is collaborating with The Plant Ontology Consortium (POC) to develop a controlled vocabulary to describe plant anatomy and the stages of plant development.

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Ontology + Definitions

Environment Ontology  (EO)

It represents a controlled vocabulary to describe different types of supplemental environments that have been reported in the experimental profiles of gene expression and phenotype (mutant and QTL) studies on cereal plants.

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Ontology + Definitions

Taxonomy Ontology  (GR_tax)

It is a representation of the taxonomy tree in the ontology format. Each term in this ontology can represent subspecies, species, genus, order, class or any rank in the classification. Primarily derived from NCBI Taxonomy, the revisions were made as and when/where required in the rankings. The rank of genome types was added by this project. This taxonomy ontology focuses on the Poaceae (Gramineae) family of plant taxonomy only.

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