DIALLEL-SAS: A SAS Program for Griffing's Diallel Analyses
- Yudong Zhang and
- Manjit S. Kang
Diallel mating designs are generally used to obtain estimates of genetic effects for a fixed set of parental lines (fixed effects) or to estimate general combining ability (GCA) and specific combining ability (SCA) variance components from a set of randomly chosen parental lines (random effects) from multiple-environment experiments. Published computer programs for diallel analyses do not provide a partition of F1 hybrids ✕ environments interaction into GCA ✕ environments, SCA ✕ environments, and reciprocal ✕ environments components for Griffing's Methods 1 and 3, and into GCA ✕ environments and SCA ✕ environments components for Griffing's Methods 2 and 4. Existing programs for Methods 1 and 3 also do not partition reciprocal effects into maternal and nonmaternal effects. This paper reports the development of a comprehensive SAS program (DIALLEL-SAS) for partitioning interactions between environments (years and/or locations) and F1 hybrids. DIALLEL-SAS can be run on any microcomputer with SAS, as well as on mainframe computers installed with SAS via UNIX or TSO. The DIALLEL-SAS output includes (i) mean squares for environments, F1 hybrids, F1 hybrids ✕ environments, GCA, SCA, reciprocal, maternal, nonmaternal, GCA ✕ environments, SCA ✕ environments, reciprocal ✕ environments, maternal ✕ environments, nonmaternal ✕ environments, (ii) estimates of GCA and maternal effects for each parental line, and (iii) estimates of SCA, nonmaternal, and reciprocal effects for each F1 hybrid.
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