Abstract
The effects of inoculum dose, inoculation method, temperature and soil water potential on transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum ) were examined in two separate experiments. Pea seed (cv. Solara), artificially inoculated with different concentrations of bacteria by dipping or vacuum infiltration, or naturally infected, was sown in pots which were maintained at different soil water potentials and temperatures. Dose received (mean number of bacteria per seed) and soil water potential had the greatest effects, with the proportion of plants infected and the mean number of lesions increasing with dose received and soil moisture. Inoculation method had little direct effect on transmission but greatly influenced the dose received. Temperature, in the range 5 to 18°C, had no effect on the number of lesions and little effect on the proportion of plants infected. Generalized linear models were derived relating the proportion of plants infected, p , and the mean number of lesions, m , to the dose received, d , and the soil water potential, ψ. The equations were: p ‐ 1 ‐exp [‐0.064 d 0.24 exp (58.55ψ)] and m = 0.24 d 0.25 exp (93.3ψ). The exponents for dose in these equations were considerably less than the theoretical value of one implied by a one‐hit model and suggested considerable heterogeneity in the one‐hit probability. Some possible explanations for this are considered.
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Claims 7
Claim · model-written summary
The proportion of pea plants infected and the mean number of lesions increased with dose received.
- Taxon
- pea
Lathyrus oleraceuse0 - Treatment
- Dose receivede1
- Interactor
- Pseudomonas syringae pv. pisi
Pseudomonas syringae pv. pisie0pathogen - Outcome
- proportion of plants infected and the mean number of lesionse1
- Direction
- increasinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e1“Dose received (mean number of bacteria per seed) and soil water potential had the greatest effects, with the proportion of plants infected and the mean number of lesions increasing with dose received and soil moisture”
Claim · model-written summary
The proportion of pea plants infected and the mean number of lesions increased with soil moisture.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- soil moisturee1
- Interactor
- Pseudomonas syringae pv. pisiPseudomonas syringae pv. pisie0pathogen
- Outcome
- proportion of plants infected and the mean number of lesionse1
- Direction
- increasinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e1“Dose received (mean number of bacteria per seed) and soil water potential had the greatest effects, with the proportion of plants infected and the mean number of lesions increasing with dose received and soil moisture”
Claim · model-written summary
Inoculation method had little direct effect on transmission of the pathogen to pea seedlings.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- Inoculation methode2
- Interactor
- Pseudomonas syringae pv. pisiPseudomonas syringae pv. pisie0pathogen
- Outcome
- transmissione2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e2“Inoculation method had little direct effect on transmission but greatly influenced the dose received”
Claim · model-written summary
Inoculation method greatly influenced the dose of bacteria received by the seed.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- Inoculation methode2
- Interactor
- Pseudomonas syringae pv. pisiPseudomonas syringae pv. pisie0pathogen
- Outcome
- dose receivede2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e2“Inoculation method had little direct effect on transmission but greatly influenced the dose received”
Claim · model-written summary
Temperature in the range 5 to 18°C had no effect on the number of lesions on pea.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- Temperaturee3
- Interactor
- Pseudomonas syringae pv. pisiPseudomonas syringae pv. pisie0pathogen
- Outcome
- number of lesionse3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e3“Temperature, in the range 5 to 18°C, had no effect on the number of lesions and little effect on the proportion of plants infected”
Claim · model-written summary
Temperature in the range 5 to 18°C had little effect on the proportion of pea plants infected.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- Temperaturee3
- Interactor
- Pseudomonas syringae pv. pisiPseudomonas syringae pv. pisie0pathogen
- Outcome
- proportion of plants infectede3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e3“Temperature, in the range 5 to 18°C, had no effect on the number of lesions and little effect on the proportion of plants infected”
Claim · model-written summary
The exponents for dose in the fitted equations were considerably less than the one-hit model value of one.
- Taxon
- peaLathyrus oleraceuse0
- Outcome
- exponents for dosee4
- Direction
- lesse4
- Comparator
- theoretical value of onee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transmission of bacterial blight ( Pseudomonas syringae pv. pisi ) from seed to seedling of pea ( Pisum sativum )”
e4“The exponents for dose in these equations were considerably less than the theoretical value of one”
The same questions in other papers
inoculation · Pseudomonas syringae pv. pisi · Lathyrus oleraceus (pea)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
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.