Variability and inheritance studies in Triticum monococcum for reaction to Puccinia graminis f.sp. tritici and P. recondita

The, T.T.

Zeitschrift fur Pflanzenzuchtung 76(4): 287-298


Accession: 000570783

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All the accessions were highly resistant, or resistant, to P. recondita. There was evidence that transference of the resistance from diploid wheat to wheat of higher ploidy will be difficult. The results of tests on the T. monococcum collection with P.g. f.sp. tritici cultures, and genetic studies on 35 of the accessions producing low reactions with at least some cultures, showed that 2 genes for resistance, Sr21 and Sr22, could be easily recognized. One exceptional accession, C69.69, produced an atypical reaction pattern and presumably possesses a gene(s) other than Sr22. Reaction patterns to members of two culture groups of P. graminis f.sp. tritici in 121 cultivated and wild T. monococcum accessions suggested that at least two loci were involved. Alleles at the loci Sr21 and Sr22 were identified from F2 and F3 segregation ratios when plants were crossed to W10, which carries Sr21, and C69.80, which carries Sr22. Some segregation ratios suggested that other genes may have been involved, but these could not be isolated. All accessions showed resistance to P. recondita.