Cultivar Evaluation and Essential Test Locations Identification for Sugarcane Breeding in China
Figure 3
Representativeness and discrimination ability based on GGE-Biplot analysis. A line represents an environmental vector between original point and environment variance. An angle value between two lines (or vectors) represents the genetic correlation coefficient between the two. An angle value of <90° indicates a positive correlation; an angle value of >90° indicates a negative correlation; and an angle value of 90° indicates no correlation. Discrimination ability is measured by the line length of the environmental vector. The circle position depends on the average environmental value of all coordinate axes of the test sites; the single arrow red line connects the original point of bi-axis with average environmental value. Site representativeness is indicated by the angle between the single arrow red line and the site vector line. The smaller the angle, the stronger the representativeness. Refer to Figure 1 legend for Panel, PC1, PC2, numerical codes for evaluation sites, and codes for cultivars.
