Abstract
Aegilops umbellulata acc. 3732, an excellent source of resistance to major wheat diseases, was used for transferring leaf rust and stripe rust resistance to cultivated wheat. An amphiploid between Ae. umbellulata acc. 3732 and Triticum durum cv. WH890 was crossed with cv. Chinese Spring PhI to induce homoeologous pairing between Ae. umbellulata and wheat chromosomes. The F1 was crossed to the susceptible Triticum aestivum cv. ‘WL711’ and leaf rust and stripe rust resistant plants were selected among the backcross progenies. Homozygous lines were selected and screened against six Puccinia triticina and four Puccinia striiformis f. sp. tritici pathotypes at the seedling stage and a mixture of prevalent pathotypes of both rust pathogens at the adult plant stage. Genomic in situ hybridization in some of the selected introgression lines detected two lines with complete Ae. umbellulata chromosomes. Depending on the rust reactions and allelism tests, the introgression lines could be classified into two groups, comprising of lines with seedling leaf rust resistance gene Lr9 and with new seedling leaf rust and stripe rust resistance genes. Inheritance studies detected an additional adult plant leaf rust resistance gene in one of the introgression lines. A minimum of three putatively new genes—two for leaf rust resistance (LrU1 and LrU2) and one for stripe rust resistance (YrU1) have been introgressed into wheat from Ae. umbellulata. Two lines with no apparent linkage drag have been identified. These lines could serve as sources of resistance to leaf rust and stripe rust in breeding programs.
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Acknowledgements
Financial assistance provided by the USDA-ARS under the Project IN-ARS-842 and Grant Number FG-In-792 to carry out this research work is gratefully acknowledged. We thank Dr. B S Gill, Distinguished Professor and Dr. Bernd Friebe, WGGRC, KSU, USA, for providing laboratory facilities for GISH analysis. We are also grateful to Dr. H S Bariana, Australian Cereal Rust Control Program, University of Sydney, Australia for a critical review of the manuscript and valuable suggestions.
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Chhuneja, P., Kaur, S., Goel, R.K. et al. Transfer of leaf rust and stripe rust resistance from Aegilops umbellulata Zhuk. to bread wheat (Triticum aestivum L.). Genet Resour Crop Evol 55, 849–859 (2008). https://doi.org/10.1007/s10722-007-9289-3
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DOI: https://doi.org/10.1007/s10722-007-9289-3