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Multivariate Analyses to Display Interactions between Environment and General or Specific Combining Ability in Hybrid Crops

^a Advanta Semillas S.A.I.C., Ruta Nac. 33 Km 636, CC 559, (2600) Venado Tuerto, Argentina
^b CSIRO Plant Industry, Queensland Bioscience Precinct, 306 Carmody Rd., St. Lucia, Qld 4067, Australia

View larger version (16K): [in a new window]   Fig. 1. Male-centered (a), female-centered (b) and double-centered (c) biplots of the first and the second principal components for oil yield of four sunflower inbred females and four sunflower inbred males averaged across 11 trial environments of Argentina. In (a), females are represented by points and males by vectors from the origin while in (b) and (c), males are represented by points and females by vectors from the origin.

View larger version (19K): [in a new window]   Fig. 2. Joint biplots of the first and the second (a) and the first (b) components of sunflower inbred females and males associated with the first (a) second (b) environment components for oil yield derived from three-mode PCA1 analysis. In (a) the loadings on the first environment component (Table 4) are superimposed to facilitate the interpretation of the joint biplot. See Table 2 for environment codes.

View larger version (19K): [in a new window]   Fig. 3. Environment-centered biplots of the first and the second principal components for oil yield of four sunflower inbred females (a) and four sunflower inbred males (b) tested in 11 trial environments of Argentina during the 2004–2005 season. Inbred lines are represented by points and environments by vectors from the origin.

View larger version (18K): [in a new window]   Fig. 4. Joint biplot of the first component of sunflower inbred females and males associated with the first environment components for oil yield derived from three-mode PCA2 analysis. See Table 2 for environment codes.