Abstract
An extension of the triparental 1 crossing procedure of Law (1966) and Aksel (1967) is described for the analysis of genetic variation between chromosome substitution lines of wheat. This extension involves the development of the complete set of second-generation hybrids. Examination of the means and variances of these generations enables not only the detection and estimation of additive and dominance effects but also the detection of within-chromosome segregation and between-chromosome interaction. The analysis is used to elucidate the genetic control of ear emergence time in chromosome substitution lines of chromosomes 5A and 5D from the variety Hope into the variety Chinese Spring. The results are in agreement with previous analyses but the greater precision now available indicates a more complex genetic situation than previously detected.
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