Question from Sunita Kumari by email:
Here is an image of monocot stem (corn stem). Sorghum will be like this. Here is link for image:
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Stems.html
This paper provides more clarity. Looks like it is outer cover
of the stalk. Please see Figure 1b.
http://www.sciencedirect.com/science/article/pii/S2090447912000524
Laurel Cooper wrote:
They are looking at the epidermis and also the fiber bundles that make up the rind
From the paper: http://www.sciencedirect.com/science/article/pii/S2090447912000524
"3.2. Microscopic investigation Microscopic picture of the cross-section, as seen in Fig. 6 (http://www.sciencedirect.com/science/article/pii/S2090447912000524#f0100)
reveals the microstructure of both, pith and rind, respectively. It can be observed that the pith consists of vascular bundles surrounded by weak tissue of large and thin-walled parenchyma cells, whereas the rind is found to be composed of compacted fibre bundles. By comparison it can also be observed, that the rind reveals higher density of fibre bundles compared to the pith. In fact, it is this higher fibre ratio that provides for higher tensile strength of the rind."
I would recommend: stem epidermis PO:0025178 along with plant fiber cell PO:0025407,
From DWS by email:
Dws wrote:
PJ wrote:
LC:
I think the term you are requesting is the shoot axis hypodermis (PO:0005057): A portion of ground tissue that is the outermost layer of a portion of a shoot axis cortex.
I would strongly advise against naming anything "grass XYZ", as we worked hard to remove all the taxon-specifc names from the PO over the past few years. I also would hesitant to call it a "rind", since that is a synonym of pericarp, but could add it as a synonym.
Not necessarily. Hypodermis does not include epidermis.
My suggested outer cortex is actually hypodermis.
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Last edit: Laurel Cooper 2014-06-12
By definition the hypodermis is the cell layer next to the epidermis, that is immediately interior (I should use the PO term but do not know how to get there from here)and that makes it also the outer layer of the cortex in stems. Because it is one cell layer (in rare instances it can be two), we need something to refer to the zone i these grasses. I talked to some people who specialize in grasses from systematists to rice molecular people and rind is not used in those communities. However, in a sense it seems appropriate. I am unsure what to do here. I agree with Laurel, no taxon adjectives should be used in the terms. Is it possible to have vegetative rind and fruit rind?
Proposed new term:
shoot axis tegument layer (PO:0025609): A portion of plant tissue (PO:0009007) that forms a tough, protective outer layer on a shoot axis and includes as parts a shoot axis hypodermis (PO:0005057) and a shoot axis epidermis (PO:0000112).
added exact synonym: shoot axis rind
Proposed new term:
stem tegument layer (PO:0025611): A portion of shoot axis tegument layer (PO:0025609) that a tough, protective outer layer on a stem (PO:0009047) and includes as parts a stem hypodermis (PO:0025610) and a stem epidermis (PO:0025178).
OBO_SF2_PO: 596
- added exact synonym: stem rind
Thanks everyone for the discussion on proposed new term for "stem rind".
Laurel, can you please update PO link at obofoundry with the new additions.
http://palea.cgrb.oregonstate.edu/viewsvn/Poc/tags/live/plant_ontology.obo?view=co
Thanks much.
Sunita
That link is for the live version- the new terms are currently available on on development browser- http://dev.plantontology.org/
You can download that version at: http://palea.cgrb.oregonstate.edu/viewsvn/Poc/trunk/ontology/OBO_format/plant_ontology.obo
They won't be on the live version till the next release- probably in a few weeks, maybe by mid July.