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Inheritance of resistance to stem rust in the wheat triticum aestivum cultivar estanzuela dakuru



Inheritance of resistance to stem rust in the wheat triticum aestivum cultivar estanzuela dakuru



Crop Science 25(4): 623-626



The inheritance of seedling reaction in the greenhouse to cultures GB121, 111-SS2 and 72.cntdot.00 of Puccinia graminis Pers. f. sp. tritici Eriks. et E. Henn. was studied in the F2, F3, backcross-F1, and backcross-F2 from resistant wheat cv. Estanzuela Dakuru crossed with susceptible 'Little Club' (LC) and 'BH 1146'. The purpose was to determine the number and type of action of genes conditioning resistance. Tests with culture GB121 indicated that E. Dakuru had 3 genes (SrDG1, SrDG2 and SrDG3) for resistance to this culture. Gene SrDG1 was epistatic to SrDG2 and SrDG3, and SrDG2 was epistatic to SrDG3. Tests with culture 111-SS2 indicated that E. Dakuru had four dominant genes (SrDS1, SrDS2, SrDS3 and SrDS4) for resistance to this culture. Genes SrDS1 and SrDS4 were epistatic to genes SrDS2 and SrDS3. Gene SrDS2 was epistatic to gene SrDS3. The segregation in E. Dakuru/BH 1146 indicated that E. Dakuru had 1 gene for resistance to culture 72.cntdot.00.

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