Srushtideep Angidi, Jesse Pahl, Julie S Pasche, William Underwood
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引用次数: 0
Abstract
Basal stalk rot (BSR) of cultivated sunflower (Helianthus annuus L.) is caused by the necrotrophic fungal pathogen Sclerotinia sclerotiorum (Lib) de Bary. This disease is economically significant and limits sunflower production in the Northern Great Plains region of the USA. Resistance to BSR is quantitative, controlled by many genes exerting small effects on the level of resistance. This genetic complexity hinders efforts to develop sunflower hybrids with sufficient resistance. Field-based disease trials have successfully identified cultivated sunflower genotypes with partial BSR resistance but failed to determine the degree of resistance. Consequently, the objectives of this study were to: (1) distinguish between highly and moderately resistant genotypes by re-evaluating 60 cultivated sunflower genotypes exhibiting partial resistance in field trials using a newly-developed greenhouse inoculation method with improved resolution; (2) determine if selected genotypes identified in Objective 1 are broadly resistant to diverse S. sclerotiorum isolates; (3) assess potential host genotype × pathogen isolate interactions between sunflower genotypes and S. sclerotiorum isolates; (4) determine if resistant genotypes carry alleles of molecular markers previously associated with BSR resistance loci and assess the frequency of these alleles in resistant germplasm. Results of this study identified sunflower inbred lines HA 124 and HIR 34 exhibiting high levels of BSR resistance against all tested S. sclerotiorum isolates. Additionally, significant host genotype × pathogen isolate interactions were detected between sunflower lines and S. sclerotiorum isolates. This information will guide breeding efforts to improve BSR resistance and facilitate prioritizing highly resistant lines for genetic mapping and further characterization.
期刊介绍：
Phytopathology publishes articles on fundamental research that advances understanding of the nature of plant diseases, the agents that cause them, their spread, the losses they cause, and measures that can be used to control them. Phytopathology considers manuscripts covering all aspects of plant diseases including bacteriology, host-parasite biochemistry and cell biology, biological control, disease control and pest management, description of new pathogen species description of new pathogen species, ecology and population biology, epidemiology, disease etiology, host genetics and resistance, mycology, nematology, plant stress and abiotic disorders, postharvest pathology and mycotoxins, and virology. Papers dealing mainly with taxonomy, such as descriptions of new plant pathogen taxa are acceptable if they include plant disease research results such as pathogenicity, host range, etc. Taxonomic papers that focus on classification, identification, and nomenclature below the subspecies level may also be submitted to Phytopathology.
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