Inheritance of seedling and adult plant resistance to leaf rust of selected Australian spring and English winter wheat varieties |
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| Authors: | D Singh R F Park R A Mcintosh |
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| Institution: | National Agriculture Research Institute, Wet-Lowlands Mainland Programme-Bubia, PO Box 1639, Lae, Morobe Province 411, Papua New Guinea;University of Sydney Plant Breeding Institute Cobbitty, Private Bag 11, Camden, NSW 2570, Australia. |
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| Abstract: | Genetic studies were conducted to gain an understanding of the inheritance of adult plant resistance (APR) to leaf rust in six common wheat varieties. The Australian varieties ‘Cranbrook’ and ‘Harrier’ each carry two genes for APR to leaf rust. These genes are genetically independent of the seedling resistance genes Lr23 and Lrl7b, carried by the respective varieties. Adult plant resistance in ‘Suneca’ was conferred by at least two genes, in addition to the seedling genes Lr1 and Lrli. It is likely that the APRs in ‘Cranbrook’, ‘Harrier’ and ‘Suneca’ are conferred by uncharacterized gene(s). Tests of allelism confirmed that seedling resistances in the varieties ‘Avocet R’, ‘Hereward’, ‘Moulin’ and ‘Pastiche’ are conferred by Lrli. Adult plant resistance in the variety ‘Hereward’ was inherited monogenically, whereas varieties ‘Moulin’ and ‘Pastiche’ each carried two dominant genes. On the basis of rust specificity and pedigree analysis, it would seem likely that the APR genes in ‘Hereward’, ‘Moulin’ and ‘Pastiche’ are also currently uncharacterized. |
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| Keywords: | Triticum aestivum Puccinia recondita Puccinia triticina plant resistance inheritance |
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