Powdery Mildew Resistance in Wheat Cultivar Mv Hombár is Conferred by a New Gene, PmHo

A new powdery mildew resistance gene designated as PmHo was identified in 'Mv Hombár' winter wheat, bred in Martonvásár, Hungary. It has exhibited a high level of resistance over the last two decades. Genetic mapping of recombinant inbred lines derived from the cross 'Ukrainka'/M...

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Bibliographic Details
Published in:Phytopathology 2016-11, Vol.106 (11), p.1326-1334
Main Authors: Komáromi, Judit, Jankovics, Tünde, Fábián, Attila, Puskás, Katalin, Zhang, Zengyan, Zhang, Miao, Li, Hongjie, Jäger, Katalin, Láng, László, Vida, Gyula
Format: Article
Language:English
Subjects:
Ascomycota - physiology
Breeding
Chromosome Mapping
Disease Resistance - genetics
DNA, Plant - genetics
Genetic Linkage
Host-Pathogen Interactions
Microsatellite Repeats - genetics
Phenotype
Plant Diseases - immunology
Plant Diseases - microbiology
Plant Proteins - genetics
Plant Proteins - metabolism
Quantitative Trait Loci - genetics
Triticum - genetics
Triticum - immunology
Triticum - microbiology
Triticum aestivum
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Summary:A new powdery mildew resistance gene designated as PmHo was identified in 'Mv Hombár' winter wheat, bred in Martonvásár, Hungary. It has exhibited a high level of resistance over the last two decades. Genetic mapping of recombinant inbred lines derived from the cross 'Ukrainka'/Mv Hombár located this gene on chromosome 2AL. The segregation ratio and consistent effect in all environments indicated that PmHo is a major dominant powdery mildew resistance gene. The race-specific nature of resistance in Mv Hombár was shown by the emergence of a single virulent pathotype designated as 51-Ho. This pathotype was, to some extent, able to infect Mv Hombár, developing visible symptoms with sporulating colonies. Microscopic studies revealed that, in incompatible interactions, posthaustorial hypersensitivity reaction was the most prevalent but not exclusive plant defense response in Mv Hombár, and fungal growth was mostly arrested during haustorium formation or in the early stages of colony development. The delayed fungal development of the virulent pathotype 51-Ho may be explained by additional effects of other loci that were also involved in the powdery mildew resistance of Mv Hombár.
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO-03-16-0152-R