Biotic stresses in triticale.
1991
Singh R.P. | Saari E.E.
Triticale currently occupies approximately 1.7 million hectares globally. All major wheat parasites are reported to infect the crop. The evolution of three new pathotypes of Puccinia graminis tritici in Australia, carrying virulences for resistance genes Sr27, SrSatu and SrSampson, has shown that highly mutable obligate parasites will pose at least as great a threat to triticale as to wheat, largely due to limited genetic diversity. Pathotypes of P. recondita tritici, with virulences for three resistance genes in triticale, have been identified in Mexico. Reports from Ecuador indicate high susceptibility of triticale to P. striiformis in that region. Genetic analyses for resistance to P.g. tritici and P.r. tritici have indicated relatively few genes. The germplasm appears to be relatively susceptible to Fusarium spp., Helminthosporium spp. and Xanthomonas campestris undulosa, whereas current resistances to Erysiphe graminis and Septoria tritici appear to be good. It is recommended that genetic diversity for resistance to highly mutable pathogens be increased preferably through the use of resistance genes from rye.
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