Multiple-disease resistance in Vicia faba: Multi-environment field testing for identification of combined resistance to rust and chocolate spot

• Published in: Field crops research 2011-10, Vol.124 (1), p.59-65
• Main Authors: Villegas-Fernández, A.M., Sillero, J.C., Emeran, A.A., Flores, F., Rubiales, D.
• Format: Article
• Language: English
• Subjects: Botrytis fabae; Crops; Faba bean; Genotype × environment interaction; Uromyces viciae-fabae; Vicia faba
• ISSN: 0378-4290; 1872-6852
• DOI: 10.1016/j.fcr.2011.06.004

► 43 accessions of Vicia faba were evaluated for combined resistance to rust and chocolate spot. ► Four field trials were carried out in Egypt and Spain. ► 11 accessions were selected for their stability and low severity. ► Growth-chamber trials confirm stability of response to rust of selected accessions. The aim of this work was to identify Vicia faba germplasm resistant both to rust and chocolate spot. A collection of 43 accessions of V. faba previously identified as chocolate-spot resistant was evaluated for rust and chocolate spot resistance in Egypt and in Spain. The genotype and genotype × environment (GGE) biplot analyses allowed the selection of 11 accessions resistant to both diseases in those locations. These 11 accessions were evaluated for rust in an additional field trial in Spain, all performing better than the susceptible check. The joint analysis of the 11 accessions in the four field trials where they had been evaluated revealed no significant effects either for genotype, environment or the genotype × environment interaction. They are hence promising sources of resistance, both for their low severities and their stable responses across the studied environments. This collection was also tested under controlled conditions against the Egyptian and the Spanish isolates of rust present in the field trials further underlining the stable performance of these genotypes. Finally, the effect of previous infection with chocolate spot on rust resistance was assessed under controlled conditions and no influence of it was found.