Release 21

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Summary and Announcements

The latest release of the Plant Ontology, version #21, is available on our Plant Ontology Browser.

Changes to the Plant Ontology

  • This full release features the addition of 37 new PO terms, for both the Plant Anatomical Entity (PAE) (31) and Plant Structure Development Stage (PSDS) (6) branches of the ontology.
  • Names have been revised for 18 PAE terms and 23 PSDS terms.
  • Definitons of many more terms have also been revised and updated.
  • Term trackers Xrefs have have been converted from the old SourceForge ids to link out to the new GitHub Issue Tracker (
  • Includes all revisions of the plant_ontology.obo file from Aug 2013 (#2228) to July 2015 (#3502) on the PO SVN site.
  • This Release includes all the changes from Aug. 6th, 2015 #33ae100 to Sep 25, 2015 #01901fa

Major Revisions to the plant anatomical entity branch:

  • A new term- native plant cell was added to describe plant cells that are either part of a multicellular whole plant (PO:0000003)in vivo, or a unicellular organism in natura (i.e. part of a natural environment). This term is a sibling to cultured plant cell which covers all the cells grownin vitro.


For more details of the new and revised terms, please see: Details_of_Changes_to_Release_21


New and Revised Annotation Data