Downy mildew caused by Plasmopara halstedii is one of the main diseases causing economic losses in cultivated sunflower. Resistance in this host is conferred by major genes denoted Pl. The inbred sunflower line QIR8, which contains the Pl8 locus and is resistant to all known downy mildew races, was used to isolate a full-length resistance gene analogue (RGA) belonging to the CC-NBC-LRR class of...

Genetically homogenous strains of Plasmopara halstedii differing in host specificity and fungicide tolerance were used to test the hypothesis that asexual genetic recombination occurs and may account for the high genotype diversity of this homothallic reproducing oomycete, which causes downy mildew in sunflower. Dual inoculation of sunflower seedlings with single zoospore strains of complementa...

background: downy mildew caused by plasmopara halstedii is one of the most devastating diseases of sunflower worldwide. so far several dominant resistance genes designated as pl have been identified and their molecular markers linked to these genes are available. however, no information on the resistance genes is available in iranian lines. objective: in this study, the presence of three map-ba...

Sunflower is one of the major oil crops in world. Diseases such as sunflower downy mildew (Plasmopara halstedii (Farl.) Berl. et de Toni) constitute a significant risk factor during production. Integrated pest management (IPM) considered an essential tool against mildew; however, pathogen variability repeatedly affects efficacy control measures. This article evaluates some vital elements diseas...