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Sunflower rust, which is incited by the fungus Puccinia helianthi Schwein., is the most common disease in Australia, Argentina, South Africa, and North America. Three independent genes, R5, R4, and R13 with two alleles R13a and R13b, were discovered in sunflower and are promising sources of resistance to rust. R5 was previously mapped to linkage group (LG) 2, and R4 and R13...
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