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Association of seedling and adult plant resistance to Sclerotium rolfsii in Jerusalem artichoke (Helianthus tuberosus L.) under field conditions

Junsopa, Chutsuda, Jogloy, Sanun, Saksirirat, Weerasak, Songsri, Patcharin, Kesmala, Thawan, Shew, BarbaraB.
European journal of plant pathology 2018 v.151 no.1 pp. 251-255
Athelia rolfsii, Helianthus tuberosus, Jerusalem artichokes, Sclerotium (genus), adults, disease control, disease course, disease incidence, disease resistance, disease severity, field experimentation, genotype, host plants, mature plants, screening, seedlings, soil fertility, stem rot, wet season
Stem rot caused by Sclerotium rolfsii is an important problem for Jerusalem artichoke production. Host plant resistance is the most promising method to control disease. If resistant genotypes can be identified in seedlings and this resistance is closely related to resistance at maturity, the evaluation of disease resistance in adult plants could be curtailed or omitted, increasing the speed and efficiency of screening. The objective of this study was to determine the relationship between resistance to S. rolfsii in Jerusalem artichoke in seedling and in adult stages under field conditions. Field experiments were set up in different soil fertility environments in the rainy season during July to October 2014. In each environment, 10 varieties of Jerusalem artichoke with differences in resistance to S. rolfsii were planted and inoculated either 15 or 45 days after transplanting. Higher disease incidence was observed on adult plant stage, but disease severity was similar for both plant stages. The correlations between seedling and adult responses were positive and significant for disease incidence, area under disease progress curve and severity index. Screening for resistance to S. rolfsii in Jerusalem artichoke can be carried out on seedlings, thus improving the efficiency of selection.