Abstract
Sunvale is a popular bread wheat variety grown throughout central and northern New South Wales in Australia which has moderate resistance to the fungal leaf disease stripe rust. However, significant levels of stripe rust have been reported in Sunvale crops over the past few seasons. Sunvale is a 17-year-old variety so genetic purity may also be involved in the numerous reports of increased disease susceptibility in grower crops. Twelve SSR markers were used to determine the genetic purity of 23 grower-retained seed lots of cv. Sunvale. Sixteen of the 23 grower-retained Sunvale seed lots (70%) contained at least 5% contamination from a different genotype, while seven samples (30%) contained > 10% contamination. The SSR analysis was complemented by field observations of the various seed lots in a replicated small plot trial. In 17 of the 19 grower-retained Sunvale seed lots that had some level of contamination with another genotype(s), at least one contaminant was very susceptible to stripe rust. The pure Sunvale plants in the plots showed a moderately resistant reaction. This is the first report of seed impurity being definitively determined as the cause of unexpected stripe rust responses within a wheat variety.
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Claims 5
Claim · model-written summary
Sixteen of 23 Sunvale seed lots contained at least 5% genotype contamination.
Verbatim
e0“Sixteen of the 23 grower-retained Sunvale seed lots (70%) contained at least 5% contamination from a different genotype”
Claim · model-written summary
Seven Sunvale seed lots had over 10% genotype contamination.
Verbatim
e0“while seven samples (30%) contained > 10% contamination.”
e1“Sunvale is a popular bread wheat variety”
Claim · model-written summary
At least one contaminant was very susceptible to stripe rust in 17 of 19 contaminated lots.
Verbatim
e0“In 17 of the 19 grower-retained Sunvale seed lots that had some level of contamination with another genotype(s), at least one contaminant was very susceptible to stripe rust.”
Claim · model-written summary
Pure Sunvale plants were moderately resistant to stripe rust.
Verbatim
e0“The pure Sunvale plants in the plots showed a moderately resistant reaction.”
Claim · model-written summary
Seed impurity was identified as the cause of unexpected stripe rust responses.
- Taxon
- wheat
Triticum aestivume0 - Interactor
- stripe ruste0pathogen
- Outcome
- unexpected stripe rust responsese0
- Qualifier
- seed impuritye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed impurity being definitively determined as the cause of unexpected stripe rust responses within a wheat variety”