Identification and multi-environment validation of resistance to Botrytis fabae in Vicia faba |
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| Authors: | AM Villegas-Fernández JC Sillero AA Emeran J Winkler B Raffiot J Tay F Flores D Rubiales |
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| Institution: | 1. Institute for Sustainable Agriculture, CSIC, Apdo. 4084, 14080 Córdoba, Spain;2. IFAPA, Alameda del Obispo, Apdo. 3092, 14080 Córdoba, Spain;3. Department of Agricultural Botany, Faculty of Agriculture, Kafr El-Sheikh University, 33516-Kafr El-Sheikh, Egypt;4. Saatzucht Gleisdorf GesmH, Am Tieberhof 33, A-8200 Gleisdorf, Austria;5. GIE des Sélectionneurs de Féverole, 12, avenue George V, 75008 Paris, France;6. INIA, Temuco, Chile;g E.P.S. La Rábida., Univ. Huelva, 21819 Palos de la Frontera, Spain |
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| Abstract: | The aim of this work was to find new sources of resistance to chocolate spot disease, and to validate their stability across different environments. In order to do so, a collection of 307 accessions of Vicia faba was screened for resistance to Botrytis fabae under field conditions; stability of resistance of the 40 most-resistant accessions was tested in a multi-location experiment in Austria, Chile, Egypt, France and Spain over two field seasons. Although complete resistance was not found, nine accessions showed interesting levels of incomplete resistance (ranging from 10 to 20% of average severity across environments, maximum average severity being 47.9%). Genotype × environment interaction accounted for 22% of the sum of squares of the multi-environment evaluation, revealing instability of the phenotypic expression across environments. This usually hampers the efficiency of selection and reduces the adaptability of the plant material. Three accessions stand out for their consistent resistance, both in terms of reduced disease severity and high stability, which make them good candidates for breeding programs. As for environments, those with the highest total severity mean were the most discriminant between accessions. In contrast, those with lower severity means were the most representative of the whole range of environments. It can be concluded that validation of resistance to chocolate spot in different environments is an essential step when screening for material of interest and should be taken into account for further works. |
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| Keywords: | Chocolate spot Faba bean Genotype × environment interaction |
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