Registration of cassava genetic resources

Contributors to this page: CIAT, Colombia (Daniel Debouck); IITA, Nigeria (Dominique Dumet); Bioversity International/ILRI, Ethiopia (Alexandra Jorge); independent consultant (Clair Hershey); INIA, Peru (Llerme Rios).

This section covers registration of cassava and Manihot wild species that are being newly introduced into a genebank. These genetic resources may be introduced as stakes (stem pieces) (within-country only), as in vitro material or as seeds. Wild species are typically introduced as seed samples from a population, while cassava is generally introduced as clonal material, where each accession is genetically uniform.

Verifying accompanying documentation

The following documentation should be sent with the new material

For all accessions:

 For accessions imported from another country (in addition to above):

Verifying the consignment

Inspection of plants to determine any plant health problems should include the following:

Assigning numbers

The introduction of cassava or Manihot material at the beginning of the conservation process can usually be accomplished in one of three different forms:

Regardless of the form of introduction, a ‘temporary identifier’ must be assigned to each individual sample of the new accession until it is decided which sample, or set of derived sub-samples, will be included in the genebank and registered officially.

The official registration involves the attribution of a permanent and unique identifier code. In the case of tissue culture introductions, an accession can be officially registered once the following conditions are met:

If the conditions described above cannot be met, then a temporary accession number must be assigned and plantlets must go through the necessary disease cleaning or multiplication process until they can be assigned a permanent number.
A step by step general guideline for registration can be seen by clicking here.

Recording information during registration

New material – introduction phase

Newly introduced meristems or nodal cuttings are often processed in batches. For each batch, a series of information should be recorded in a table with the following fields (example from IITA):

On-going material – germplasm already in the genebank

Once an accession is already introduced in the bank, its permanent accession number should be added to the database. For each accession the following data should be recorded (example below is from IITA; the details of this sequence will vary according to the needs and procedures of each specific genebank):

References and further reading

Ceballos H. 2006. Cassava research at CIAT [poster]. Centro Internacional de Agricultura Tropical (CIAT), Cali, Colombia. Available from: Date accessed: 26 August 2010.

Guevara CL, Mafla G. 1996. Manihot collections held at CIAT. In: Engelmann F, editor. Management of field and in vitro germplasm collections. CIAT, Cali, Colombia. pp. 109-112.

Mafla G, Roa JC, Debouck DG. 2004. Observations about the distribution of cassava germplasm from an international collection. Poster presented at the CBN-V. Available from: Date accessed: 26 August 2010.

Mafla G, Roa JC, Flor NC, Aranzales E, Debouck DG. 2006. Distribution of cassava germplasm from an international genebank: a service to the global agriculture. Poster presented at the First meeting of the Governing Body, ITPGRFA, Madrid, Spain, 12-16 June 2006. Available from: Date accessed: 26 August 2010.

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The Genebanks

The 11 CGIAR genebanks currently conserve 730,000 of cereals and grain legumes, forage crops, tree species, root and tuber crops, bananas and crop wild relatives.