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Suppression of stem rust puccinia graminis f sp tritici resistance in the hexa ploid wheat triticum aestivum cultivar canthatch by chromosome 7dl



Suppression of stem rust puccinia graminis f sp tritici resistance in the hexa ploid wheat triticum aestivum cultivar canthatch by chromosome 7dl



Canadian Journal of Botany 58(12): 1347-1350



The nullisomy for chromosome 7D (2n = 40) of the hexaploid wheat cv. Canthatch (T. aestivum L., 2n = 42) was resistant in both the seedling and adult-plant stages to several races of stem rust (P. graminis Pers. f. sp. tritici Eriks. and E. Henn) to which normal disomic 'Canthatch' (2n = 42) was susceptible. Since ditelosomic 7DL (2n = 40 + tt) reacted in the same manner as 'Canthatch', a gene(s) is apparently present on the long arm of chromosome 7D that suppresses resistance determined by other genes, probably on chromosomes of the A and B genomes. The suppressor was evidently derived from the ancestral, diploid progenitor of common wheat, Aegilops squarrosa L., rather than by mutation at the hexaploid level. The results provide a genetic explanation for apparent failures of some attempts to transfer stem rust and leaf rust resistance to hexaploid wheat from diploid and tetraploid relatives.

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