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2005, vol. 20, iss. 4, pp. 235-240
Pyrenophom tritici-repentis: A cause of pseudo-resistance to Puccinia triticina
aInstitute of Field and Vegetable Crops, Novi Sad
bResearch Institute of Crop Protection, Department of Applied Genetics, Praha, Ryzine, Czech Republic
Keywords: Puccinia triticina; Pyrenophora tritici-repentis; pseudo-resistance
Abstract
Fourteen winter wheat varieties obtained from the Czech Republic for testing disease resistance were sown in dishes and grown in the field next to the LRTCW line and variety Rodna of Serbia and Montenegro, 2003. All genotypes were found by the type of reaction to be susceptible to Puccinia triticina at the seedling stage in the greenhouse. In four varieties with comparatively short leaves, Pyrenophora tritici-repentis was found to appear at a frequency of 20% on the leaves below the last two. The following year untreated seeds of all varieties were sown in the field and no Pyrenophora tritici-repentis was found. The average difference in the intensity of Puccinia triticina infection on the last two leaves between the two years was 51% for the varieties with P. tritici-repentis, and 23% for the other group. Even small amounts of toxins decreased the development of the obligate parasite. The hypothesis of a seed-borne character of Pyrenophora tritici-repentis was supported in the other varieties grown in close proximity. They showed early spike maturation, compared with the flag leaf and lower resistance to low temperatures in 2004 and 2005.
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article language: Serbian
document type: Scientific Paper
published in SCIndeks: 02/06/2007

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