Genetical assessment of induced quantitative variation following hierarchical selfing

Abstract

The method of Virk, Jinks and Pooni (7) has been further elaborated and illustrated with a simple example from the plant height data of Borojević and Borojević (3) experiment on 15 kR gamma-ray-irradiated Bankut-1205 wheat variety in the M 5, M 6 and M 7 generations. A substantial amount of the induced variation for plant height has been found to be of additive and fixable nature. The practical utility of the method for testing the adequacy of a simple model and estimating the genetical components of variation has been amply demonstrated. The simplicity and distinctiveness of the new approach arises from the omission of rank 0 statistics corresponding to the M 1 plants and arriving at the genetical equivalance of rank ≧ 1 statistics in the hierarchical analysis of variance performed on the simple pedigreed data generated in a selfing series initiated in the M 1 generation following mutagenic treatment of a pure-breeding line. The new analysis avoids any assumptions about the independence or kind of dependence of mutational events and provides estimates of the additive and dominance genetical components of variation, from a single generation from M 3 onwards.