Crop Genebank Knowledge Base

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Terms used on the Crop Genebank Knowledge Base.

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Term Definition

A computerized coding system that uses a printed pattern or bars on labels to identify germplasm accessions. Barcodes are read by optically scanning the printed pattern and using a computer program to decode the pattern.

Base collection

A collection of germplasm that is conserved in long-term secure storage and is not used as a routine distribution source. Seed is usually stored at sub-zero temperatures and low moisture content.

Base unit

The number of seeds needed to ensure the successful implementation of a procedure such as registration or regeneration.

Basic Local Alignment Search Tool

(BLAST) A bioinformatics tool to find matches between a DNA sequence and known sequences stored in databases.

Bayesian analysis

A statistical approach for constructing phylogenetic trees related to maximum likelihood that operates on a priori weighting factors and probabilities (see maximum likelihood parsimony).


The totality of genes species and ecosystems in a given region be it a microhabitat or the world. Also called biological diversity.


Bioversity International (website)

Bootstrap analysis

A method in cladistic analysis to infer the ???strength??? or ???confidence??? of a branch on a phylogenetic tree obtained by generating trees many times from a sample distribution of characters. Bootstrap values theoretically can vary from 0% (poor support) to 100% (excellent support).


The propagation and genetic manipulation by hybridization or deliberate self-crossing of plants for the purpose of selecting improved offspring.

Breeding line

A group of identical pure-breeding diploid or polyploid organisms that are distinguished from other individuals of the same species by a unique phenotype and genotype.

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Sources for this glossary: IPGRI Tech. Bulletin 10: Molecular markers for genebank management and Seed handling in genebanks training course
Glossary open source software by M. Brampton

International Agricultural Research Centres who worked together to make this site possible:
Africa Rice Center | Bioversity International | CIAT | CIMMYT | CIP | ICARDA | ICRISAT | IFPRI | IITA | ILRI | IRRI |

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