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This message proposes a refinement of the anatomical ontology.

In dicotelydons, the petiole, like the stem, consists of a dermal, fundamental (ground) and vascular system.  Its epidermis consists in one layer of cells and contains elongated epidermal cells and stomatal complexes, although the latter occur less frequently in petioles than in leaf lamina. Under the epidermal layer is the ground tissue of which the outer region is the cortex and the inner region is the pith. These two regions are interconnected by the interfascicular parenchyma. In the vascular system (stele), the vascular bundles (xylem and phloem) are separated by this interfascicular parenchyma. The pith is located in the very centre of the stele.

This organisation can be summarized as follows, from the outside in: 

Petiole
·	dermal system
              - epidermis
              - stomatal complex
·	cortex
·	vascular system 
              - phloem
              - xylem
              - interfascicular parenchyma
              - pith

As there is presently no subdivision under the term “petiole”, would it be possible to add these categories in the ontology tree?  Definitions of the terminology used above are similar to those listed in the current ontology  but are here applied for petioles. Do not hesitate to contact us back if you need any additional information regarding this proposal.


Ruth De Groodt
Björn De Meyer
Pierre Hilson


name: Ruth De Groodt

email: ruth.degroodt at psb.ugent.be

organization: VIB - Department of Plant Systems Biology

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