March
2015
, Volume
99
, Number
3
Pages
370
-
375
Authors
Valérie Caffier, INRA, UMR1345 Institut de Recherche en Horticulture et Semences, 49071 Beaucouzé, France; AgroCampus-Ouest, UMR1345 Institut de Recherche en Horticulture et Semences, 49045 Angers, France; Université d'Angers, UMR1345 Institut de Recherche en Horticulture et Semences, SFR 4207 QUASAV, 49045 Angers, France;
Andrea Patocchi, Agroscope Research Station, Phytopathology, P.B., 8820 Wädenswil, Switzerland;
Pascale Expert,
Marie-Noëlle Bellanger, and
Charles-Eric Durel, INRA, UMR1345 Institut de Recherche en Horticulture et Semences, 49071 Beaucouzé, France; AgroCampus-Ouest, UMR1345 Institut de Recherche en Horticulture et Semences, 49045 Angers, France; Université d'Angers, UMR1345 Institut de Recherche en Horticulture et Semences, SFR 4207 QUASAV, 49045 Angers, France;
Maja Hilber-Bodmer, Agroscope Research Station, Phytopathology, P.B., 8820 Wädenswil, Switzerland;
Giovanni A. L. Broggini, Agroscope Research Station, Phytopathology, P.B., 8820 Wädenswil, Switzerland; Swiss Federal Institute of Technology Zürich ETHZ, Phytopathology Group, Universitätstrasse 2, Zürich, Switzerland;
Remmelt Groenwold, Wageningen University and Research, Plant Breeding, P.O. Box 16, 6700AA Wageningen, The Netherlands; and
Vincent G. M. Bus, The New Zealand Institute for Plant & Food Research Limited, Private Bag 1401, Havelock North 4157, New Zealand
Affiliations
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Accepted for publication 14 September 2014.
Abstract
Abstract
A set of differential hosts has recently been identified for 17 apple scab resistance genes in an updated system for defining gene-for-gene (GfG) relationships in the Venturia inaequalis-Malus pathosystem. However, a set of reference isolates characterized for their complementary avirulence alleles is not yet available. In this paper, we report on improving the set of differential hosts for h(7) and propose the apple genotype LPG3-29 as carrying the single major resistance gene Rvi7. We characterized a reference set of 23 V. inaequalis isolates on 14 differential apple hosts carrying major resistance genes under controlled conditions. We identified isolates that were virulent on at least one of the following defined resistance gene hosts: h(1), h(2), h(3), h(4), h(5), h(6), h(7), h(8), h(9), h(10), and h(13). Sixteen different virulence patterns were observed. In general, the isolates carried one to three virulences, but some of them were more complex, with up to six virulences. This set of well-characterized isolates will be helpful for the identification of additional apple scab resistance genes in apple germplasm and the characterization of new GfG relationships to help improve our understanding of the host-pathogen interactions in the V. inaequalis-Malus pathosystem.
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Copyright © 2015 The American Phytopathological Society
