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Abstract
In previous papers (JINKS 19544,1956) the analysis of the parents, F,’s, F2’s and I backcross generations of an 8 x 8 diallel between inbred varieties of Nico- tiana rustica using the method of diallel analysis described by JINKS and HAY- MAN (1953), and extended by SINKS (1954), HAYMAN (1954), DICKINSON and JINKS (1956) and JINKS (1956) have been presented. They showed that non- allelic interactions, as well as additive and dominance effects, play an important role in the inheritance of all the three characters followed, namely, final height, time of flowering and leaf size. This finding was subsequently confirmed for a number of diallel sets of crosses in other species where a wide range of characters were followed (JINKS 1955; ALLARD 1956). What is more important to our pres- ent discussion, however, was the finding that the F, generation of crosses show- ing nonallelic interactions were in general superior in their performance to those of noninteracting crosses. This appears to implicate nonallelic interactions as a major source of heterosis, and we shall now attempt to assess the magnitude of their contribution relative to those of the other components of heterosis.
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