Abstract
One hundred fifty rhizobacteria isolated from roots of Swiss chard grown in a soil suppressive to the sugar beet cyst nematode, Heterodera schachtii, were tested for their influence on the nematode's ability to hatch and infect roots. Two screening systems were used that focused on the ability of bacteria to inhibit either nematode hatching or root infection. Most of the bacterial strains reduced hatching in vitro compared to the control, while with 5% of the strains there were 0% hatch. Seven percent of all strains significantly reduced second-stage juvenile (J2) infection of mustard roots raised in soil-less growth pouches. Eighteen strains from four genera (Bacillus, Pseudomonas, Variovorax, and Arthrobacter) were selected for greenhouse trials. In the greenhouse trials four bacterial strains, including two strains of Bacillus megaterium, reduced nematode infection of sugar beet when eggs were used as inoculum. Seven bacterial strains reduced nematode infection of sugar beet in one of two trials when plants were inoculated with J2. Most of the effective strains were Bacillus spp., primarily B. megaterium. Colonization of sugar beets roots by two B. megaterium strains was found to be stable over 30 days in the greenhouse.
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Claims 6
Claim · model-written summary
Most strains reduced nematode hatching in vitro.
Not reportedTaxon
Verbatim
e0“Most of the bacterial strains reduced hatching in vitro compared to the control”
Claim · model-written summary
Five percent of strains produced zero nematode hatch.
Not reportedTaxon
Verbatim
e0“with 5% of the strains there were 0% hatch.”
Claim · model-written summary
Seven percent of strains reduced juvenile infection of mustard roots.
- Taxon
- mustarde0
- Treatment
- strainse0
- Outcome
- second-stage juvenile (J2) infectione0
- Direction
- reducede0
- Value
- Seven percente0
Not reportedComparator
Verbatim
e0“Seven percent of all strains significantly reduced second-stage juvenile (J2) infection of mustard roots raised in soil-less growth pouches.”
Claim · model-written summary
Four bacterial strains reduced nematode infection of sugar beet using egg inoculum.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise0 - Treatment
- four bacterial strainse0
- Outcome
- nematode infectione0
- Direction
- reducede0
- Qualifier
- when eggs were used as inoculume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four bacterial strains, including two strains of Bacillus megaterium, reduced nematode infection of sugar beet when eggs were used as inoculum.”
Claim · model-written summary
Seven bacterial strains reduced nematode infection of sugar beet with juvenile inoculum in one trial.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Treatment
- Seven bacterial strainse0
- Outcome
- nematode infectione0
- Direction
- reducede0
- Qualifier
- in one of two trialse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seven bacterial strains reduced nematode infection of sugar beet in one of two trials when plants were inoculated with J2.”
Claim · model-written summary
Two B. megaterium strains stably colonized sugar beet roots for 30 days.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0
- Interactor
- B. megaterium
Priestia megateriume0biocontrol_agent - Outcome
- Colonization of sugar beets rootse0
- Value
- 30 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Colonization of sugar beets roots by two B. megaterium strains was found to be stable over 30 days in the greenhouse.”
The same questions in other papers
inoculation · pest · Beta vulgaris (beet)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
3 papers more in this group
See all 7 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.