Crop Genebank Knowledge Base

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Terms used on the Crop Genebank Knowledge Base.

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Term Definition

A crop cultivar that has evolved through many years of farmer-directed selection and that is specifically adapted to local conditions landraces are usually genetically heterogeneous.

Leucine Rich Repeat

(LRR) Conserved domain of disease resistance genes.

Linkage disequilibrium

The non-random association of the alleles from different loci in the gametes.

Linked markers

The presence of genes (or molecular probes) close to each other on chromosomes so that they are never completely independently assorted the degree of linkage is greater the closer the genes or markers are on the same chromosome.

Locus (plural: loci)

The specific place on a chromosome where a gene or particular piece of DNA is located.

Long branch attraction

A phenomenon in cladistic analyses where strongly unequal rates of evolutionary change in different members of a group cause cladistics to produce incorrect trees.

Long-term conservation

The storage of germplasm for a long period such as in base collections and duplicate collections. The period of storage before seeds need to be regenerated varies but is at least several decades and possibly a century or more. Long-term conservation takes place at sub-zero temperatures.


An enzyme used to determine the concentration of ATP as a measurable real-time light signal in pyrosequencing.


Meters above sea level

Mantel test

A test that computes the linear correlation between two proximity matrices (dissimilarity or similarity) used in phenetics to test whether results from different analyses of the same taxa are similar or different.

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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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