CBGG

Corteva Agriscience cotton breeders were early adopters of GGE Biplot analysis and they have consistently used GGE Biplot as a valuable tool in analyzing G × E interactions in variety advancement trials. After the preliminary evaluations of new experimental lines are conducted by maturity group within their expected areas of adaptation, Corteva combines the more advanced “elite” lines across the early-mid and late maturity programs into the same trial for uniform testing across the eastern half of the US Cotton Belt. The resulting balanced dataset has been analyzed with GGE Biplot to identify meaningful patterns in the data regarding genotype main effects and multiplicative G × E interaction effects. While the maturity of genotypes and the latitude of locations have generally been the primary sources for G × E in Corteva cotton trials, the development of experimental lines with host plant resistance to root-knot nematodes and reniform nematodes has more recently complicated trial analysis. The exclusion of cross-over environments from “GGE-N” and “GGE-S” means has better identified which early-mid or late maturing genotypes should be advanced as compared to typical geographical breakouts. GGE Biplot has proven to be very useful in peeling through the layers of G × E interactions to make effective cotton variety advancement decisions.

GGE; Biplot; G × E; cotton; Phytogen; Corteva; nematode; resistance; maturity