Abstract
This study, carried out under field conditions, assessed the extent to which temporary breakdown of mlo‐ resistance, following relief of water‐stress, was determined by genetic background and mlo allele. Commercial barley cultivars expressing the mlo gene for resistance to powdery mildew ( Erysiphe graminis ( Blumeria graminis ) f.sp. hordei ) were tested as well as doubled haploid progeny from spring barley genotypes, a proportion of which were sown in the field in two successive years. Plants were protected from natural rain by a mobile rain shelter and either watered by trickle‐irrigation or allowed to dry. Percentage mildew infection resulting from natural inoculum was recorded and the doubled haploid genotypes were classified as resistant, intermediate or susceptible on the basis of their control (watered) treatment scores. In each of the three designated classes, particular genotypes developed infection levels, following relief of water‐stress, that were higher than those observed on the well‐watered controls. This was found not to be related to the mlo allele as there was no significant difference between the increases observed on resistant plants carrying mlo9 and resistant plants carrying mlo11 . Differences in the degree of breakdown of resistance were attributed to genetic background rather than to the specific mlo allele.
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Claims 3
Claim · model-written summary
Some barley genotypes in all resistance classes developed higher mildew infection after water-stress relief than watered controls.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- relief of water‐stresse0
- Interactor
- powdery mildewe1pathogen
- Outcome
- infection levelse0
- Direction
- highere0
- Comparator
- well‐watered controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In each of the three designated classes, particular genotypes developed infection levels, following relief of water‐stress, that were higher than those observed on the well‐watered controls”
t0“spring barley”
e1“powdery mildew”
Claim · model-written summary
Mildew infection increases did not differ significantly between resistant plants carrying mlo9 and mlo11.
- Taxon
- barleyHordeum vulgaret0
- Interactor
- powdery mildewe1pathogen
- Gene
- mlo9e0
- Outcome
- increases observed on resistant plantse0
- Direction
- no significant differencee0
- Comparator
- mlo11e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant difference between the increases observed on resistant plants carrying mlo9 and resistant plants carrying mlo11”
t0“spring barley”
e1“powdery mildew”
Claim · model-written summary
Resistance-breakdown differences were attributed to genetic background rather than the specific mlo allele.
- Taxon
- barleyHordeum vulgaret0
- Material
- genetic backgrounde0
- Interactor
- powdery mildewe1pathogen
- Gene
- mlo allelee0
- Outcome
- degree of breakdown of resistancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in the degree of breakdown of resistance were attributed to genetic background rather than to the specific mlo allele”
t0“spring barley”
e1“powdery mildew”
The same questions in other papers
drought · disease · Hordeum vulgare (barley)Positive and negative results
1 paper in the same direction as this paper · 12 in the opposite direction
- positive
- positive
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10 papers more in this group
See all 14 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.