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Biplot Analysis of Test Sites and Trait Relations of Soybean in Ontario

Crop Science Div., Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1

View larger version (36K): [in a new window]   Fig. 1. Yearly GGE biplots for yield data from 1994–1999 soybean trials in the 2800 corn heat unit area of Ontario. The names of the test sites are spelled out in lowercase letters, with the first letter indicating the exact position of the site; the vertex genotypes are spelled out in uppercase letters, and all other genotypes are represented by "c".

View larger version (18K): [in a new window]   Fig. 2. GGE biplot based on the yield data of 28 soybean genotypes that were tested all three years from 1997–1999. (A) The genotype by environment biplot taking each year-site combination as a single environment; (B) the genotype by site biplot on the basis of data averaged over years. The names of the test sites are in lowercase letters and the names of the genotypes in uppercase letters. EXET = Exeter, STPA = St. Pauls, WINC = Winchester, and WDST = Woodstock.

View larger version (27K): [in a new window]   Fig. 3. The yearly soybean genotype by trait biplots of 1994–1999. The traits are spelled out in lowercase letters, and each genotype is represented by "c". DTM = days to maturity, HEIGHT = Plant height, KW = 100 seed weight, LODG = lodging scores, OIL = percentage of oil, PROTEIN = percentage of protein, YLD = seed yield, YOIL = oil yield per unit land area, and YPROT = protein yield per unit land area.

View larger version (26K): [in a new window]   Fig. 4. The polygon view of the genotype by trait biplot for 1999, demonstrating soybean genotype comparison on the basis of a GT biplot. DTM = days to maturity, HEIGHT = Plant height, KW = 100 seed weight, LODG = lodging scores, OIL = percentage of oil, PROTEIN = percentage of protein, YLD = seed yield, YOIL = oil yield per unit land area, and YPROT = protein yield per unit land area.

View larger version (15K): [in a new window]   Fig. 5. Soybean Genotype selection on the basis of a GT biplot. (A) Selection on the basis of seed yield; (B) selection on the basis of oil and protein concentration; (C) selection on the basis of oil concentration and seed yield; (D) selection on the basis of protein concentration and seed yield; and (E) selection on the basis of oil yield and protein yield. DTM = days to maturity, HEIGHT = Plant height, KW = 100 seed weight, LODG = lodging scores, OIL = percentage of oil, PROTEIN = percentage of protein, YLD = seed yield, YOIL = oil yield per unit land area, and YPROT = protein yield per unit land area.