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GGE Biplot

GGE Biplot. Rebecca Nolan. What is GGE biplot?. A software program designed by Weikai Yan GGE stands for G enotype main effect and G enotype X E nvironment interaction Scatter plot that plots both genotypes and environments in the same plot. What can it do?. Show patterns in the data

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GGE Biplot

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  1. GGE Biplot Rebecca Nolan

  2. What is GGE biplot? • A software program designed by Weikai Yan • GGE stands for Genotype main effect and Genotype X Environment interaction • Scatter plot that plots both genotypes and environments in the same plot

  3. What can it do? • Show patterns in the data • Identify the best or worst cultivars in certain environments • Show relationships among environments • Mega environments • Show discriminating ability of an environment

  4. What can’t it do? • Show statistical significance • Everything is relative • Units mean nothing • Take interesting pattern and go back to the original data to perform statistical analysis

  5. What types of data can GGE biplot be use for? • Genotype by environment data on a single trait – ex. Yield • Genotype by trait two-way data- ex yield, height, and maturity • Diallel cross data – ex identify good combining ability • In fact any two-way matrix data can be done

  6. How does it work? • Principal component analysis is run on the data • PC1 by PC2 is plotted • Can look at other PCs • PC1 represents mostly genotype effect • PC2 represents mostly GXE interaction

  7. How does it work? cont. • What about the environment main effect? • Removed before principal component analysis is done • Expect there to be an effect, but it is not important from a breeder’s perspective

  8. What can it do? • Show patterns in the data • Identify the best or worst cultivars in certain environments • Show relationships among environments • Mega environments • Show discriminating ability of an environment

  9. Where can I get the program? • From Weikai Yan • Website – http://ggebiplot.com • Crop Sci 41:19-25 2001. • Crop Sci 40:597-605 2000.

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