Abstract
Ascochyta blight of pea is caused by four related fungi, Ascochyta pisi , Phoma koolunga , Ascochyta pinodes and Ascochyta pinodella . The latter two taxa appear to be much more common and economically significant worldwide but the relative impact of each fungus on ascochyta blight epidemics is not well understood. To study the spatiotemporal distribution of A. pinodes and A. pinodella infecting pea in France, 368 isolates were sampled monthly, from February to May, at three locations (Rennes, Boigneville and Dijon) and molecular markers were used to genotype isolates. The aggressiveness of isolates from the fourth sampling date was estimated using a detached leaf assay on the winter cultivar Enduro. Disease was low during the sampling period as climatic conditions were generally not conducive to disease development (cold temperature, low rainfall). Population genetic analysis showed that 99% of the observed variation could be attributed to variation within populations compared to only 1% among populations. Both species were observed in each location, although A. pinodella was observed at a lower frequency (6–32%). Moreover, results showed that both species could develop on different nodes of the plant. Significant differences in aggressiveness were observed between species and among isolates within species with A. pinodes isolates being significantly more aggressive on average than A. pinodella isolates. These results emphasize the necessity to study the components of disease complexes in order to understand the impact of pathogen species interactions on disease and yield reduction as well as the dynamics of disease epidemics during the cropping season.
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Claims 9
Claim · model-written summary
Disease was low during the sampling period.
- Taxon
- pea
Lathyrus oleraceuse1 - Outcome
- Disease was lowe0
- Qualifier
- cold temperature, low rainfalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease was low during the sampling period as climatic conditions were generally not conducive to disease development (cold temperature, low rainfall).”
e1“Ascochyta blight of pea”
Claim · model-written summary
Within-population variation accounted for 99% of observed genetic variation.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- variation within populationse0
- Value
- 99%e0
- Comparator
- among populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Population genetic analysis showed that 99% of the observed variation could be attributed to variation within populations compared to only 1% among populations.”
e1“Ascochyta blight of pea”
Claim · model-written summary
Among-population variation accounted for 1% of observed genetic variation.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- 1% among populationse0
- Value
- 1%e0
- Comparator
- within populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Population genetic analysis showed that 99% of the observed variation could be attributed to variation within populations compared to only 1% among populations.”
e1“Ascochyta blight of pea”
Claim · model-written summary
Both species occurred at each sampled location.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- Both species were observed in each locatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both species were observed in each location, although A. pinodella was observed at a lower frequency (6–32%).”
e1“Ascochyta blight of pea”
Claim · model-written summary
A. pinodella had a lower frequency of 6–32%.
- Taxon
- peaLathyrus oleraceuse1
- Interactor
- A. pinodellaDidymella pinodellae0pathogen
- Outcome
- lower frequencye0
- Direction
- lowere0
- Value
- 6–32%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. pinodella was observed at a lower frequency (6–32%).”
e1“Ascochyta blight of pea”
Claim · model-written summary
Both species developed on different pea nodes.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- develop on different nodes of the plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both species could develop on different nodes of the plant.”
e1“Ascochyta blight of pea”
Claim · model-written summary
Aggressiveness differed significantly between the two species.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- differences in aggressiveness were observed between speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences in aggressiveness were observed between species and among isolates within species with A. pinodes isolates being significantly more aggressive on average than A. pinodella isolates.”
e1“Ascochyta blight of pea”
Claim · model-written summary
Aggressiveness differed significantly among isolates within species.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- among isolates within speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences in aggressiveness were observed between species and among isolates within species with A. pinodes isolates being significantly more aggressive on average than A. pinodella isolates.”
e1“Ascochyta blight of pea”
Claim · model-written summary
A. pinodes isolates were significantly more aggressive than A. pinodella isolates.
- Taxon
- peaLathyrus oleraceuse1
- Interactor
- A. pinodes
Didymella pinodese0pathogen - Outcome
- A. pinodes isolates being significantly more aggressivee0
- Direction
- more aggressivee0
- Comparator
- A. pinodella isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. pinodes isolates being significantly more aggressive on average than A. pinodella isolates.”
e1“Ascochyta blight of pea”