*Sequence number* is assigned manually or by a computer system to ensure there are
no duplicates. Some institutes prefer to zero-pad the number `00000102`.
The *suffix* allows differentiating samples of the same original material. The
exact meaning of the suffix is different for every institute.
[cols="1,1,1,2", options="header"]
.Example accession numbers
|===
|Prefix|Sequence number|Suffix|Accession number
|TMe|419||TMe-419
|TVSu|13||TVSu-13
|===
[[accedoc-other]]
=== Other accession identifiers
Material enters the collection by collecting, from breeding programs,
or acquisition from other institutes. In each case, the material will already have some
identifier assigned by the collector, breeder or other institute.
*Accession name* is the vernacular name of the material and is commonly captured by
the collector or assigned by the breeder.
[[accedoc-coll]]
==== Collected material
Genebank accessions obtained through collecting missions should maintain data about the site and dates of the
collecting and collector information.
[[accedoc-bred]]
==== Breeders material
Lines developed by breeding programs of the institute may be included the collection. Information provided by the breeders
should include the pedigree, ancestral information of the material, along with names and identifiers used by the breeding
program and the codes and names of institutes that developed the material.
[[accedoc-acq]]
==== Acquisitions
Material coming from other institutes and genebanks must be accompanied by accession passport data
as documented in the source genebank.
NOTE: *Country of origin* is the country where the material was collected or bred, not the country of source genebank.
Accession documentation should capture any identifiers provided by the source institute. This data
allows for validation and curation of passport data between the genebanks and allows researchers
to obtain material from either collection.
[[accedoc-tax]]
=== Taxonomy
Accession genus, species, species author, subtaxon and subtaxon authority are usually
known, but are subject to change after expert identification or change in taxonomic system.
https://npgsweb.ars-grin.gov/gringlobal/taxon/abouttaxonomy.aspx[GRIN Taxonomy for Plants] and the Mansfeld database can serve for validating accession taxa.
[[accedoc-storage]]
=== Storage and maintenance
Ex situ genebanks maintain PGR material as seed, in the field, in vitro, cryo or in DNA collections.
Inventories (lots) of one accession may be managed by different methods (e.g. seed and cryo).
See <<mcpd-storage,Storage>> in MCPD standard on how to capture multiple types of storage.
segregating populations, hybrids, modern cultivars, etc.).
|COLLSITE|Location information below the country level that describes where the accession was collected,
preferable in English. This might include the distance in kilometers and direction from the nearest town,
village or map grid reference point, (e.g. `7km south of Curitiba in the state of Parana`).
|DECLATITUDE|Latitude expressed in decimal degrees. Positive values are North of the Equator; negative values are South of the Equator (e.g. `-44.6975`).
|DECLONGITUDE|Longitude expressed in decimal degrees. Positive values are East of the Greenwich Meridian; negative values are West of the Greenwich Meridian (e.g. `+120.9123`).
|COORDUNCERT|Uncertainty associated with the coordinates in meters. Leave the value empty if the uncertainty is unknown.
|COORDDATUM|The geodetic datum or spatial reference system upon which the coordinates given in decimal latitude
and longitude are based (e.g. `WGS84`, `ETRS89`, `NAD83`). The GPS uses the WGS84 datum.
|GEOREFMETH|The georeferencing method used (`GPS`, determined from `map`, `gazetteer`, or `estimated using software`).
Leave the value empty if georeferencing method is not known.
|ELEVATION|Elevation of collecting site expressed in meters above sea level. Negative values are not allowed.
|COLLDATE|Collecting date of the sample, where YYYY is the year, MM is the month and DD is the day. Missing data (MM or DD) should be indicated with hyphens or '00' [double szero].
|<<mcpd-wiews,BREDCODE>>|FAO WIEWS code of the institute that has bred the material. If the holding institute
has bred the material, the breeding institute code (BREDCODE) should be the same as the holding institute code (INSTCODE).
Follows INSTCODE standard.
|BREDNAME|Name of the institute (or person) that bred the material. This descriptor should only be used if BREDCODE cannot
be filled because the FAO WIEWS code for this institute is not available.
|<<mcpd-sampstat,SAMPSTAT>>|Biological status of the accession.
|ANCEST|Information about either pedigree or other description of ancestral information (e.g. parent variety
in case of mutant or selection). For example a pedigree `Hanna/7*Atlas//Turk/8*Atlas` or a description `mutation found in Hanna`,
`selection from Irene` or `cross involving amongst others Hanna and Irene`.
|COLLSRC|Collecting/acquisition source
|<<mcpd-wiews,DONORCODE>>|FAO WIEWS code of the donor institute. Follows INSTCODE standard.
|DONORNAME|Name of the donor institute (or person). This descriptor should be used only if DONORCODE cannot be filled because FAO WIEWS code for this institute is not available.
|DONORNUMB|Identifier assigned to an accession by the donor. Follows ACCENUMB standard.
|OTHERNUMB|Any other identifiers known to exist in other collections for this accession. Use the following
format: `INSTCODE:ACCENUMB;INSTCODE:identifier;…` INSTCODE and identifier are separated by a colon `:` without space.
Pairs of INSTCODE and identifier are separated by a semicolon `;` without space.
When the institute is not known, the identifier should be preceeded by a colon.
|<<mcpd-wiews,DUPLSITE>>|FAO WIEWS code of the institute(s) where a safety duplicate of the accession is maintained.
|DUPLINSTNAME|Name of the institute where a safety duplicate of the accession is maintained.
|<<mcpd-storage,STORAGE>>|Type of germplasm storage. If germplasm is maintained under different types of storage,
multiple choices are alllowed, separated by a semicolon (e.g. `20;30`).
|MLSSTAT|The status of an accession with regards to the Multilateral System (MLS) of the International Treaty on
Plant Genetic Resources for Food and Agriculture. Leave the value empty if the status is not known.
|REMARKS|The remarks field is used to add notes or to elaborate on descriptors with value `99` or `999` (= Other). Prefix remarks with the field name they refer to and a colon (:) without space (e.g. `COLLSRC:riverside`). Distinct remarks referring to different fields are separated by semicolon without space.
|===
[[mcpd-wiews]]
==== Institute codes in MCPD
Values for `INSTCODE`, `COLLCODE`, `BREDCODE`, `DONORCODE` and `DUPLSITE` must be provided as
<<wiews-instcode,FAO WIEWS codes>> of institutes.
[[mcpd-sampstat]]
==== Biological status of accession
The coding scheme proposed can be used at 2 different levels of detail: either by using the
general codes such as `100`, `200`, `300`, `400`, or by using the more specific codes
