Abstract

MARISCAL-AMARO, L. Antonio et al. Genetics of resistance to stem rust (Puccinia graminis f. sp. avenae Erikss. & Henning) in three genotypes of oat (Avena sativa L.). Agrociencia [online]. 2009, vol.43, n.8, pp.869-879. ISSN 2521-9766.

The genetics of resistance to stem rust was determined in three resistant oat genotypes (Karma, Avemex and Calandria) by analysis of progenies derived from their crosses with the susceptible varieties Chihuahua and Opalo. Segregation in the F₃ generations of Karma progeny was adjusted to two dominant complementary genes (1:8:7, for resistant, segregating and susceptible). For Avemex, the phenotypic ratio for the same generations was 1:2:1 indicating the presence of a dominant gene. The Calandria progeny segregated in the phenotypic proportion of 3:1 of resistant and susceptible, which indicates that in this progenitor one dominant gene confers resistance.

Keywords : Avena sativa L.; Puccinia graminis Pers. F. sp. avenae Erikss. and Henn.; resistance genes.