Abstract
Ergot of cereals, caused by Claviceps purpurea, results in yield loss and downgrading of infested grain because of toxic alkaloids in the sclerotia. Resistant wheat genotypes are known, but their effectiveness against different C. purpurea isolates over geographic regions has not been studied. The objective of this study was to examine the pathogenic variability among isolates of C. purpurea on wheat lines differing in resistance. Under controlled environmental conditions, 41 single spore isolates of C. purpurea were obtained from Canadian and UK collections and inoculated onto a set of wheat genotypes composed of durum wheat lines ‘Melita’, ‘Kyle’ and 9260B-173A, and hexaploid spring wheat lines ‘Cadillac’, ‘Vista’, ‘Kenya Farmer’, ‘Lee’ and HY630. Honeydew production and weight of sclerotia produced per spike were assessed. There were significant differences among the wheat genotypes for overall reactions to the pathogen isolates, and among pathogen isolates for geographic origin and host origin. Twenty virulence phenotypes were identified using the honeydew production data, and 23 virulence phenotypes identified using the sclerotial weight data from the 41 isolates. The existence of different virulence phenotypes indicates that variability in virulence exists in populations of C. purpurea, and knowledge of virulence phenotypes is necessary to effectively breed for resistant commercial lines.
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Claims 5
Claim · model-written summary
Wheat genotypes differed significantly in overall reactions to the pathogen isolates.
- Taxon
- wheat
Triticum aestivume0 - Interactor
- pathogen isolatese0pathogen
- Outcome
- overall reactions to the pathogen isolatese0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant differences among the wheat genotypes for overall reactions to the pathogen isolates”
Claim · model-written summary
Pathogen isolates differed significantly by geographic and host origin.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- Claviceps purpurea
Claviceps purpureat0pathogen - Outcome
- pathogen isolates for geographic origin and host origine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among pathogen isolates for geographic origin and host origin”
t0“Claviceps purpurea isolates on wheat”
Claim · model-written summary
Honeydew production data distinguished twenty virulence phenotypes among 41 isolates.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- Claviceps purpureaClaviceps purpureat0pathogen
- Outcome
- virulence phenotypese0
- Value
- Twentye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twenty virulence phenotypes were identified using the honeydew production data”
t0“Claviceps purpurea isolates on wheat”
Claim · model-written summary
Sclerotial weight data distinguished 23 virulence phenotypes among 41 isolates.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- Claviceps purpureaClaviceps purpureat0pathogen
- Outcome
- virulence phenotypese0
- Value
- 23e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“23 virulence phenotypes identified using the sclerotial weight data from the 41 isolates”
t0“Claviceps purpurea isolates on wheat”
Claim · model-written summary
The authors conclude that knowledge of virulence phenotypes is needed to breed resistant commercial lines effectively.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- knowledge of virulence phenotypes is necessary to effectively breed for resistant commercial linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“knowledge of virulence phenotypes is necessary to effectively breed for resistant commercial lines”
t0“Claviceps purpurea isolates on wheat”