Sources of resistance in common bean accessions to a set of races of Uromyces appendiculatus

Magdalena Koleva, Ivan Kiryakov

Abstract: Common bean rust is a sporadic disease in the northern parts of Bulgaria, but occurs annually in The Rhodope Mountains. The use of resistant varieties is the most cost-effective and environmentally friendly method of disease control. Finding sources of resistance to the distributed races of the pathogen is of paramount importance in breeding of such varieties. The aim of the present study was to establish sources of resistance among 34 bean accessions to six pathotypes of races 20-0, 20-3, 20-19, 29-0, 29-1 and 52-3 of U. appendiculatus. Four of the accessions (51051, CSW 643, NEP 2 and KW 814) are resistant to the pathotypes used and can be used as donors of bean rust resistance. Two samples showed a resistant phenotype to five of the pathotypes, four were resistant to four pathotypes, and six accessions showed resistant reaction to three of the U. appendiculatus pathotypes. Four of the accessions (VAX 4, VAX 6, DG 2-36-58-3, Dresden) have complex resistance to the most economically significant diseases in common beans and can be included in a breeding program aimed at creating varieties of beans with complex resistance.

Keywords: common bean; P. vulgaris; resistance; rust; U. appendiculatus

Date published: 2021-03-22