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Sclerotinia sclerotiorum  (Lib.) de Bary is one of the major diseases of sunflower ( Helianthus annuus ). The pathogen can attack all parts of the plant at every stage of plant growth, predominantly the capitulum, leaf and stem. In the present study, several perennial  Helianthus  species of diverse origin were evaluated for resistance level to mid-stem and leaf infection using an inoculation method. The evaluation revealed considerable and significant differences among the genotypes in all recorded resistance traits. Three genotypes showed enhanced resistance levels to mid-stem reaction. Two genotypes exhibit resistances to leaf infection. Since all evaluated resistant genotypes in these trials are sexually incompatible with the  Helianthus annuus  genome, newly developed biotechnological methods gain particular importance for the transfer of the discovered levels of resistance into the cultivated sunflower.

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SOURCES OF RESISTANCE TO Sclerotinia sclerotiorum (Lib.) de Bary IN A NATURAL Helianthus GENE POOL / RESISTENCIAS CONTRA Sclerotinia sclerotiorum (Lib.) de Bary EN LA POPULACIÓN NATURAL DE GIRASOL (Helianthus) / RÉSISTANCES CONTRE Sclerotinia sclerotiorum (Lib.) de Bary EN LA POPULATION NATUREL DU TURNESOL (Helianthus)