Reciprocal, maternal and non-maternal effects in radiata pine diallel mating experiment on four australia sites
2001
Wu H.X. | Matheson, A.C. (CSIRO Division of Forestry and Forest Products, Kingston (Australia))
To investigate the importance of the reciprocal effect in a series of Australia-wide radiata pine 6 ~ 6 half-diallel matings, one diallel mating set was deliberately mated to include reciprocal crosses. At age ten and a half, five traits (DBH, stem straightness, branch angle, branch size and cluster whorl number) were assessed at four sites, and the reciprocal effects were estimated and partitioned into the maternal and non-maternal components. General combined ability was significant (P 0.001) for DBH, stem straightness, branch angle, and branch size while specific combined ability was significant (P 0.039) for stem straightness, branch angle, and cluster number. The overall reciprocal effect was significant for branch angle only; however, there are reciprocal effects in individual pair-crosses for DBH, branch size and cluster number. A partitioning of these significant reciprocal effects suggests either maternal (e.g. cytoplasmic DNA effect) and non-maternal effects (e.g. interaction effect between nuclear and cytoplasmic DNA) or purely non-maternal interaction may be the causes of the reciprocal effects. The observed overall weak reciprocal effect in this experiment indicates that (1) reciprocal mating could be used if it is easier or cheaper to use a particular parent as female for commercial production in radiata pine, and (2) half-diallel mating is suitable for the mating design to estimate genetic parameters and variance components, and pooling reciprocal crosses into a half-diallel mating structure should be acceptable for the standard half-diallel genetic analysis
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