Inheritance of Triticum militinae Zhuk. derived leaf rust and stem rust resistance in common wheat

Abstract

The rust resistant hexaploid stocks, Selection (Sel.) T 2600 and Sel. T 216-1 derived from T. aestivum x T. militinae cross were analysed to study the mode of inher.itance and to establish the identity of genes conditioning seedling resistance to the leaf rust pathotype 77-5 and stem rust pathotype 40-1. The genetic analysis of different filial generations viz., Pl' P2, Fl , F2 and BCl F1 of the crosses Agra Local x Sel. T 2600, Lal Bahadur x Sel. T 2600, Chinese Spring x Sel. T 2600, Agra Local x Sel. T 216-1, Kalyansona x Sel. T 216-1 and Chinese Spring x Sel. T 216-1 revealed that the resistance to leaf rust and stem rust was controlled by a single dominant gene. The test of allelism indicated that the gene governing leaf rust resistance in Sel. T 2600 was different from the known genes Lng, Lr24 and Lr28 and that of Sel. T 216-1 from Lr9, Lng and Lr28. The gene for leaf rust resistance in Sel. T 2600 and Sel. T 216-1 was allelic to Lr9 and Lr24, respectively. The stem rust resistance present in Sel. T 216-1 was distinctly different than that of 5124 and 5126 as established through the test of allelism and the pattern of infection type.