Transferring of sclerotinia resistance from wild into cultivated sunflower: Evaluation of wild sunflower species

Abstract

Accessions of H. mollis, H. maximiliani, H. rigidus and H. tuberosus were screened for resistance to Sclerotinia, during the two-year period (2001-2002). Artificial inoculation methods were used for that purpose. In the first year, only a stem resistance to Sclerotinia infection was observed, while in the second year, heads and stems of tested plants were infected by mycelia and sclerotia of this pathogen. Some differences in the response to mycelium and sclerotia infection within the same species were observed, as well as, differences in the response to sclerotial stem infection in different years. The H. mollis accession 1298 was found to be of a special interest for breeding as it was resistant to both head and stem infections with sclerotia.

Populacije H. mollis, H. maximiliani, H. rigidus i H. tuberosus su testirane na otpornost prema Sclerotinia, tokom dvogodišnjeg perioda, upotrebom metoda veštačke inokulacije. U prvoj godini ispitivana je samo otpornost prema infekciji stabla sklerocijama, dok su u drugoj godini glave i stabla testiranih biljaka zaražavane i micelijom i sklerocijama ovog patogena. Tokom ispitivanja su uočene razlike u reakciji na infekciju micelijom i sklerocijama u okviru iste vrste, kao i razlike u reakciji na zaražavanje sklerocijama u različitim godinama. Populacija 1298 H. mollis se pokazala interesantnom za oplemenjivanje, pošto je bila otporna i na infekciju glave i na infekciju stabla sklerocijama.