Abstract
The aim of the present study was to determine the presence of genes for resistance to gray spots in sunflower /Phomopsis helianthi Munt. Cvet. еt al./ in wild species of genus Helianthus. The study included accessions of wild annual Helianthus annuus L. (w.f.) and some perennial wild Helianthus species, preserved and maintained in the ex-situ collection at the DAI, General Toshevo. Two isolates of the pathogen were used for infection- Ph 21-6214 and Ph21-211, with each of which three plants from each sample were infected according to a 3x2 scheme. The plants‘ reaction was checked 21 days after inoculation on a nine-ball scale. High resistance (VR) to both pathogen isolates was found in 9 samples of Helianthus annuus L. (w.f.) and in 2 accessions of the perennials H. mollis and H. resinosus. Resistance (R) to both pathogen isolates was shown by two samples from the annual and one from the perennial species. Five samples of Helianthus annuus L. (w.f.) were found to be resistant to pathogen isolate Ph21-6214 and the same number to pathogen isolate Ph21-211. From the obtained results, it could be concluded that the observed reactions of high resistance and resistance in samples from wild species of sunflower can be successfully used as potential sources of genes for resistance to the pathogen in sunflower breeding.
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