A new gene conferring resistance to anthracnose in Andean common bean (<i>Phaseolus vulgaris</i> L.) cultivar ‘Jalo Vermelho’

Abstract

Abstract ‘Jalo Vermelho’ is a large seeded Andean landrace of common bean ( Phaseolus vulgaris L.) that constitutes an important source of anthracnose resistance, disease caused by Colletotrichum lindemuthianum . This landrace has different resistance spectrum, when compared with cultivars of Andean origin, indicating the presence of an anthracnose‐resistant gene different from Co ‐ 1 locus. This anthracnose resistance was characterized by inheritance and allelism tests were carried out on the following genes: Co ‐ 1 , Co ‐ 1 2 , Co ‐ 1 3 , Co ‐ 1 5 , Co ‐ 2 , Co ‐ 3 , Co ‐ 4 , Co ‐ 5 , Co ‐ 6 , Co ‐ 7 , Co ‐ 9 , Co ‐ 10 , Co ‐ 11 and Co‐13 . Resistance to races 23, 55, 89 and 453 in ‘Jalo Vermelho’ was conditioned by a single dominant gene. Allelism tests in F 2 populations demonstrated that ‘Jalo Vermelho’ carries a dominant gene located at a distinct locus, differing from previously characterized genes. Based on its independence from previously described loci, the authors propose that the ‘Jalo Vermelho’s gene should be named Co ‐ 12 . This new gene is a valuable source of resistance to anthracnose which can be transferred to commercial cultivars to enhance the effectiveness of resistance gene pyramiding in bean breeding programmes.