Intergeneric Transfer (Rye to Wheat) of a Gene(s) for Russian Wheat Aphid Resistance |
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Authors: | G F Marais M Horn F Du Torr |
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Institution: | Department of Genetics, University of Stellenbosch, Stellenbosh 7600, Republic of South Africa;PANNAR (Pty) Limited, P.O. Box 171-64, Bainsvlei 9338, Republic of South Africa. |
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Abstract: | An octoploid triticale was derived from the F, of a Russian wheat aphid-resistant rye, ‘Turkey 77’, and ‘Chinese Spring’ wheat. The alloploid was crossed to common wheat, and to ‘Imperial’ rye/‘Chinese Spring’ disomic addition lines. F2, progeny from these crosses were tested for Russian wheat aphid resistance and C-banded. A resistance gene(s) was found to be associated with chromosome arm IRS of the ‘Turkey 77’ rye genome. A monotelosomic IRS (‘Turkey 77’) addition plant was then crossed with the wheat cultivar ‘Gamtoos’, which has the 1BL.1RS ‘Veery’ translocation. Unlike the IRS segment in ‘Gamtoos’, the ‘Turkey 77’-derived 1 RS telosome did not express the rust resistance genes Sr31 and Ar26, which could then be used as markers. From the F, a monotelosomic 1 RS addition plant that was also heterozygous for the 1BL. 1 RS translocation was selected and testerossed with an aphid-susceptible common wheat, ‘Inia 66’ Meiotic pairing between the rye arms resulted in the recovery of five euploid Russian-wheat-aphid-resistant plants. One recombinant also retained Sr31 and Lr26 and was selfed to produce translocation homozygotes. |
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Keywords: | Triticum aestivum Secale cereale Diuraphis noxia insect resistance intergenetic gene transfer |
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