tendril

[planteome-user]

This term was requested by TraitNet during the beta review.

Defintion from Beentje (2010): a slender, coiling structure derived from a branch, leaf or inflorescence and used for climbing.

This is problematic, ontologically, because it can derived from multiple types of structures. May want to make separate terms: branch tendril (child of branch), leaf tendril (child of leaf), etc. Leaf tendrils could arise from the whole leaf or from a part of the leaf (leaflet). Alternative is to make these terms synonyms (as phenotypes), e.g., leaflet tendril is synonym of leaflet.

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/181

[planteome-user]

A tendril is a modified form of stem, leaf or petiole with a string-like structure that is used by climbing plants for support and attachment, generally by twining around whatever it touches. They do not have a lamina or blade, but they can photosynthesize. ... source: en.wikipedia.org/wiki/Tendril

Also I think synonymy is not an option considering its a modified form specialized for an additional function. I suggest creating parent 'tendril' with children like tendril is_a leaf tendril part_of leaf is_a stem tendril part_of stem is_a branch tendril part_of branch is_a inflorescence tendril part_of inflorescence

With this it also opens up a need to have additional relationship that suggests its 'modified_form_of/transformed_from' relationship to its parent. e.g leaf (often its the tip) tendril is_a tendril; part_of leaf ; 'modified_form_of/transformed_from' leaf tip.

Don't forget to add stem in the definition, there are many examples of leaf tendril.

Original comment by: jaiswalp

[planteome-user]

Here are the definitions I proposed on a agenda that we have never gotten to:

Defintion from Beentje (2010): a slender, coiling structure derived from a branch, leaf or inflorescence and used for climbing. tendrils can derived from multiple types of structures. Suggest we make separate terms:

branch tendril (child of branch): A branch that is slender and coiling. Comment: Aids plant in climbing.

leaf tendril (child of leaf): A leaf that is slender and coiling and lacks a lamina. Comment: Aids plant in climbing.

leaflet tendril (child of leaflet): A leaflet that is slender and coiling. Comment: Aids plant in climbing.

leaf apex tendril (child of leaf apex): A leaf apex that is slender and coiling. Comment: Aids plant in climbing.

Can add other types of tendrils if they come up or users need them.

This is consistent with what we did for spine. These have is_a relationships to their respective structures, rather than part_of, which I think is more biologically accurate, but has the drawback that the different types of tendrils don't group together.

Re. using a new relation like 'modified_form_of/transformed_from', we had extensive discussion of the at the RCN meeting homology breakout group. Flybase is using something like "evolutionarily_derived_from". There were mixed feelings about whether or not these homology relationships should be part of an anatomy ontology or accessory to it. We should discuss it more.

Original comment by: rlwalls2008

[planteome-user]

At the POC meeting on 11-1-11, we decided that it was better to add individual types of tendrils as sub-types of their respective structures. We should not create a general class for tendril, because it does not have a structural basis. The only thing they have in common is shape/function.

We should request "tendril shaped" in PATO and define all these as tendril shaped. Then, in the future, we could add an intersection_of statement that says has_quality tendril shape. Then one could create a category for tendrils that is the intersection_of is_a plant structure and has_quality tendril shaped. For now, we will have to define the shape separately in each term.

We should put a comment on the different types of tendrils referring users to the other kinds of tendrils, in case they end up on the wrong one. Should probably do this for spine too.

In addition to branch, leaf, leaflet, and leaf apex tendril, we should add tendril terms for: shoot axis tendril, rachis tendril, and prophyll tendril.

Original comment by: rlwalls2008

[planteome-user]

Proposed definitions for tendril terms:

leaf tendril (child of vascular leaf): A vascular leaf that is slender and coiling and lacks a lamina. Comment: Aids plant in climbing. A leaf tendril will usually have a bud or shoot axis in its axil. See also leaflet tendril (PO:xxx), leaf apex tendril (PO:xxx), branch tendril (PO:xxx), stem apex tendril (PO:xxx), leaf rachis tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

leaflet tendril (child of leaflet): A leaflet that is slender and coiling and lacks a lamina. Comment: Aids plant in climbing. If the tendril is derived from the terminal leaflet, use this term instead of leaf apex tendril (PO:xxxx). See also leaf tendril (PO:xxx), leaf apex tendril (PO:xxx), branch tendril (PO:xxx), stem apex tendril (PO:xxx), leaf rachis tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

leaf apex tendril (child of leaf apex, part_of vascular leaf): A leaf apex of a laminar vascular leaf that is slender and coiling. Comment: Aids plant in climbing. Found at the apex of a leaf lamina, but the leaf apex tendril is may not be laminar or it may be a narrow lamina. If the tendril is derived from the terminal leaflet, use the term leaflet tendril (PO:xxxxxxx). See also leaf tendril (PO:xxx), leaflet tendril (PO:xxx), branch tendril (PO:xxx), stem apex tendril (PO:xxx), leaf rachis tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

branch tendril (child of branch): A branch that is slender and coiling. Comment: Aids plant in climbing. A branch tendril will usually be subtended by a leaf or leaf scar. May be branched, may have adhesive disks at its distal end, may be woody, and may bear small leaves. See also leaf tendril (PO:xxx), leaflet tendril (PO:xxx), leaf apex tendril (PO:xxx), stem apex tendril (PO:xxx), leaf rachis tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

stem apex tendril (child of shoot axis): A shoot axis that arises from the apical part of a stem and is slender and coiling. Comment: Aids plant in climbing. May be branched, may have adhesive disks at its distal end, may be woody, and may bear small leaves. A stem apex tendril differs from a branch tendril in that it arises from the shoot apical meristem, rather than in an axil. However, a shoot apex tendril may arise either from the apex itself, in which case it is terminal, or from the side of an apical meristem, in which case it is a lateral structure. In the latter case, the main stem of the plant undergoes sympodial growth. A stem apex tendril is often located on the opposite side of a stem from a leaf at the same node, as in Vitaceae. See also leaf tendril (PO:xxx), leaflet tendril (PO:xxx), leaf apex tendril (PO:xxx), leaf rachis tendril (PO:xxx), branch tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

leaf rachis tendril (child of leaf rachis): A leaf rachis that is slender and coiling and lacks a lamina. Comment: Aids plant in climbing. Differs from a leaf tendril, in that a leaf rachis tendril bear leaflets. See also leaf tendril (PO:xxx), leaflet tendril (PO:xxx), leaf apex tendril (PO:xxx), branch tendril (PO:xxx), stem apex tendril (PO:xxx), and prophyll tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

prophyll tendril (child of prophyll): A prophyll that is slender and coiling and lacks a lamina. Comment: Aids plant in climbing. A prophyll may be difficult to distinguish from a branch tendril, because it may be found in the axil of a leaf, but it develops from a prophyll of the axillary bud, rather than a branch. Found in Curburitaceae. See also leaf tendril (PO:xxx), leaflet tendril (PO:xxx), leaf apex tendril (PO:xxx), branch tendril (PO:xxx), stem apex tendril (PO:xxx), and leaf rachis tendril (PO:xxx). Careful observation is required to correctly classify some tendrils.

Whew.

Original comment by: rlwalls2008

[planteome-user]

Definitions and comments from my previous post come from Bell and Brian's "Plant Form".

Original comment by: rlwalls2008

[planteome-user]

The proposed terms and definitions were approved at the POC meeting on 11-8-11.

Added the following new terms: leaf tendril (PO:0025361) leaflet tendril (PO:0025362) leaf apex tendril (PO:0025363) branch tendril (PO:0025364) stem apex tendril (PO:0025365) leaf rachis tendril (PO:0025366) prophyll tendril (PO:0025367)

tendril is a broad synonym of all of them.

Closing this item.

Original comment by: rlwalls2008

[planteome-user]

I would use Adrian Bell as source for this.

Original comment by: dws409