Genotype × environment interactions

A genotype x environment interaction may be defined as a change in the relative performance of a ’< character » of two or more genotypes measured in two or more environments. Interactions may therefore involve changes in rank order for genotypes between environments and changes in the absolute and relative magnitude of the genetic, environmental and phenotypic variances between environments. The genetic correlations for performance of genotypes between environments are assumed to be based on both linkage and pleiotropy and in this respect are similar to genetic correlations between traits in the same genotypes and environments. Interactions are probably not eliminated if only the low performance environments are excluded. However, there is evidence that heritability increases with increases in levels of performance though the change may be the result of increases in genetic variation or decreases in environmental variation or both. Within the usual range of environments found amongst commercial production units, the changes in variance may be sufficiently large and interactions sufficiently small to warrant a choice of environments used for selection. There are now many reports of the magnitude of genetic correlation between environments for characters of economic importance in cattle, sheep, pigs and particularly poultry. The correlations do not deviate so far from I as was perhaps originally suspected and the environments included have to differ considerably for rank order changes to be important. Extreme differences in environmental rainfall, temperature, photoperiod, space, diet and feeding method, and disease exposure are the conditions most likely to result in low genetic correlations.

• Publication year

  1972

• Venue

  Annales de Génétique et de Sélection Animale

• Publication date

  1972-01-15

• Fields of study

  Biology, Medicine, Environmental Science

• Identifiers
  DOI 10.1186/1297-9686-4-1-117PMID 22896348PMCID 3316302
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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