Linkage of the Pa₄ and Ml_a, Loci in Barley¹

Abstract

The Pa 4 gene conditioning reaction to barley leaf rust ( Puccinia hordei Otth.) in the cultivar ‘Gold’ ( Hordeum distichum L. emend. Lam.) was found to be linked with the Ml n gene conditioning resistance to powdery mildew ( Erysiphe graminis D.C.f. sp. hordei Em. Marchal) in the cultivar ‘Cebada Capa’ (H. vulgare L.). The Pa 4 locus was found to be 17.0 ± 3.5 crossover units from Ml n on chromosome 5.