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Probable Genotype of Some Triticum aestivum ‘Agent’ Derivatives for Reaction to Puccinia recondita f. sp. tritici¹

Analysis of infection-type data from ‘Agent’ wheat (Triticum aestivum L. em Thell.) derivatives and their parent cultivars inoculated with selected cultures of Puccinia recondita Rob. ex Desm. f. sp. tritici indicated that ‘Blueboy’ and ‘Blueboy II’ probably have the genes for low reaction Lr1 and Lr10; in addition, Blueboy II has a gene for low reaction from Agent ‘Fox’ wheat probably carries Lr10 in addition to the Agent gene for low reaction; Lr10 in Fox was probably derived from its parent cultivar, ‘Tascosa.’ Cultures of P. recondita virulent to Agent, Fox, and Tascosa, but avirulent to a nearisogenic line having Lr1, have been discovered. These cultures do not attack Blueboy or Blueboy II, apparently due to the effect of PLr1/Lr1. These results suggest a potentially useful approach to breeding for rust resistance in wheat, the use of known combinations of genes for low reaction in cultivars, developed by backcrossing a recurrent parent having several genes with a donor parent with a single widely effective gene, coupled with deployment of different gene combinations into different geographic areas.

Key Words: Disease resistance • Wheat leaf rust • Host:parasite specificity

² Research Plant Pathologist, Agricultural Research Service, USDA, Department of Plant Pathology, Kansas State University, Manhattan, Kans. 66506.

Received for publication August 8, 1972.