lateral root

[planteome-user]

lateral root (PO:0020121), current def.: A root that develops from a lateral root primordium located in the pericycle layer of a primary root.

Not all lateral roots develop form the pericycle. In ferns and some seed plant, lateral roots can arise in the endodermis.

proposed def.: A root (PO:0009005) that develops from a lateral root primordium (PO:0000016) that is part of another root.

comment: A lateral root primordium may develops on any root, including a primary root (PO:0020127), on an existing lateral root (PO:0020121), or a shoot-borne root (PO:0000042) . In seed plants, a lateral root primordium generally develops from pericycle cells (PO:0025261), but cells of an endodermis (PO:0000252) may also participate in its formation in some species. In ferns, lateral root primordia develop from the endodermis.

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/473

[planteome-user]

Can you provide an evidence paper on 'In ferns and some seed plant, lateral roots can arise in the endodermis.'

I agree on the proposed definition.

You may also think about having two distinct lateral root primordium

-lateral root primordium
-isa--endodermis derived lateral root primordium
-isa--pericycle derived lateral root primordium
-develops from--lateral root

Original comment by: jaiswalp

[planteome-user]

I can add a reference for ferns. I have a book reference, but will look for a paper too.

I think adding terms for endodermis-derived lateral root primordium and pericycle-derived lateral root primordium is a good idea. I don't think you can say that they develop from a lateral root, though, because they could also develop from a primary root.

Original comment by: rlwalls2008

[planteome-user]

The proposed definition was accepted at the POC meeting on 5-22-12.

References: ref.: Steves and Sussex (ISBN:0521288959), POC:curators.

This also follows the definition proposed by Rich Zobel from the ISSR nomenclature (https://sourceforge.net/tracker/index.php?func=detail&aid=2899934&group\_id=76834&atid=835555\).

It would be nice to be able to credit RZ and the ISSR for their contributions to root terms. Should be add a definition dbxref for ISSR?

Also see trackers for non-pericyclic and pericyclic lateral root (https://sourceforge.net/tracker/?func=detail&aid=3079725&group\_id=76834&atid=835555\) and root primordium (https://sourceforge.net/tracker/?func=detail&aid=3522014&group\_id=76834&atid=835555\).

Original comment by: rlwalls2008

[planteome-user]

• priority: 6 --> 1
• status: open --> closed-fixed

Original comment by: rlwalls2008

[planteome-user]

DWS made the comment that in the proposed definition, it is not clear what "another root" means.

New definition: A root (PO:0009005) that develops from a lateral root primordium (PO:0000016) that is part of another root on the same plant.

(added "on the same plant").

Original comment by: rlwalls2008

[planteome-user]

• status: closed-fixed --> open-fixed

Original comment by: rlwalls2008

[planteome-user]

• status: open-fixed --> closed-fixed

Original comment by: rlwalls2008