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Two Types of GGE Biplots for Analyzing Multi-Environment Trial Data

^a Dep. of Plant Agriculture, Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
^b Dep. of Agronomy and Dep. of Statistics, Univ. of Kentucky, Lexington, KY 40546-0091
^c Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico

View larger version (26K): [in a new window]   Fig. 1. SREG2 and SREGM+1 biplots for the 1998 Ontario winter wheat performance trial data. The numbers are different cultivars; the sites are EA = Elora, HN = Harriston, ID = Inwood, NN = Nairn, OA = Ottawa, RN = Ridgetown, WE = Woodslee, WK = Woodstock.

View larger version (18K): [in a new window]   Fig. 2. SREG2 and SREGM+1 biplots for the 1996 Ontario winter wheat performance trial data. The numbers are different cultivars; the sites are CA = Centralia, EA = Elora, HN = Harriston, HW = Harrow, ID = Inwood, OA = Ottawa, RN = Ridgetown, WE = Woodslee, WK = Woodstock.

View larger version (17K): [in a new window]   Fig. 3. SREG2 and SREGM+1 biplots for the 1995 Ontario winter wheat performance trial data. Each site is represented by a number, and each cultivar is represented by a number preceded by the latter G.

View larger version (19K): [in a new window]   Fig. 4. SREG2 and SREGM+1 biplots for the 19961999 Ontario winter wheat performance trial data. Sites in different years are represented by different symbols. The full cultivar names are: 2533 = Pioneer 25W33, Ari = OAC Ariss, Fre = Freedom, Fun = Fundulea, Han = Hanover, Har = Harus, Kar = Karena, Mar= Marilee, Men = Mendon, Mor = AC Morley, Ron = AC Ron.

View larger version (18K): [in a new window]   Fig. 5. Genotype main effect (G) as percentage of GGE and the correlation coefficient (r) between the genotype PC1 scores of the SREG2 model and the genotype main effects for 12 datasets from the 1989-1999 Ontario winter wheat performance trials.