Reference Ontologies for Plants:

• Plant Ontology (PO) Visit PO Wiki page | Download
• Browse PO: plant anatomical entity
• Browse PO: plant structure development stage
• Plant Trait Ontology (TO) Browse TO | Download
• Plant Experimental Conditions Ontology (PECO) Browse PECO | Download
• Plant Stress Ontology (PSO) work in progress

• Gene Ontology (GO) Visit GO project website | Download
  • Browse GO: biological process
  • Browse GO: cellular component
  • Browse GO: molecular function
• Phenotype and Attribute Ontology (Visit PATO project)
• Browse PATO: quality
• Chemical Entities of Biological Interest (Visit ChEBI)
• Browse ChEBI: chemical entity