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Marker (QTL) effect-by-environment biplot - QQE biplot

 

A marker (or QTL) by environment table contains effects of each marker (QTL) on the trait of question in each of the environments. 

The appropriate biplot based on such data should be based on SVD of original data without centering. The biplot is called a QTL-by-environment biplot or QQE biplot. 

 

The following information can be visualized in a QQE biplot:

 

 

 

 

 

A complete example of QQE biplot analysis is presented in Yan and Tinker (2005, Molecular Breeding).