Abstract
Abstract Background Root-knot nematodes are among the world’s most damaging endoparasitic sedentary nematodes, especially, Meloidogyne incognita that infects a wide range of plant hosts . The activity of different antagonistic bacteria was studied for the low-cost and eco-friendly management of M. incognita on eggplant. Main body Twenty-five isolates were isolated from rhizosphere soils infected with nematodes. Of these, 6 isolates displayed the highest activity, demonstrating 100% mortality of J2 nematodes under laboratory conditions. Partial sequencing of 16S rRNA gene and phylogenetic analysis was used to identify the selected isolates and they were found to be Paenibacillus amylolyticus , Brevibacillus agri , Gluconobacter frateurii , Beijerinckia mobilis , Achromobacter aloeverae , and Pseudomonas stutzeri . The abilities of the selected isolates to produce hydrogen cyanide, siderophores, chitinase, protease, indole acetic acid, and to dissolve phosphorus were also detected. Conclusion The results of the greenhouse experiment indicated that all the tested bacteria had a greatly significant effectiveness for suppressing root-knot nematode M. incognita . Application of all the rhizosphere bacteria and their combinations reduced the number of galls, number of juveniles, egg-masses, eggs, females, and total final population. All bio-agent treatments succeeded in improving the plant growth parameters and increased the microbial density in eggplant rhizosphere.
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Claims 8
Claim · model-written summary
Six bacterial isolates caused 100% mortality of M. incognita J2 nematodes under laboratory conditions.
Verbatim
e0“6 isolates displayed the highest activity, demonstrating 100% mortality of J2 nematodes under laboratory conditions”
Claim · model-written summary
The selected isolates were identified by partial 16S rRNA sequencing and phylogenetic analysis as Paenibacillus amylolyticus, Brevibacillus agri, Gluconobacter frateurii, Beijerinckia mobilis, Achromobacter aloeverae and Pseudomonas stutzeri.
Verbatim
e0“Partial sequencing of 16S rRNA gene and phylogenetic analysis was used to identify the selected isolates and they were found to be Paenibacillus amylolyticus , Brevibacillus agri , Gluconobacter frateurii , Beijerinckia mobilis , Achromobacter aloeverae , and Pseudomonas stutzeri”
Claim · model-written summary
The selected isolates were detected to produce hydrogen cyanide, siderophores, chitinase, protease and indole acetic acid and to dissolve phosphorus.
Verbatim
e0“The abilities of the selected isolates to produce hydrogen cyanide, siderophores, chitinase, protease, indole acetic acid, and to dissolve phosphorus were also detected”
Claim · model-written summary
In a greenhouse experiment all tested bacteria were greatly and significantly effective in suppressing M. incognita on eggplant.
- Taxon
- eggplant
Solanum melongenae1 - Treatment
- all the tested bacteriae0
- Interactor
- M. incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae0pathogen - Second interactor
- tested bacteriae0biocontrol_agent
- Outcome
- suppressing root-knot nematode M. incognitae0
- Direction
- suppressinge0
- Setting
- greenhouse experimente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e0“all the tested bacteria had a greatly significant effectiveness for suppressing root-knot nematode M. incognita”
e1“management of M. incognita on eggplant”
e2“The results of the greenhouse experiment”
Claim · model-written summary
Application of all the rhizosphere bacteria and their combinations reduced the number of galls, the number of juveniles and egg-masses of M. incognita on eggplant.
- Taxon
- eggplantSolanum melongenae1
- Treatment
- all the rhizosphere bacteria and their combinationse0
- Interactor
- M. incognitaMeloidogyne incognitae1pathogen
- Outcome
- number of galls, number of juveniles, egg-massese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of all the rhizosphere bacteria and their combinations reduced the number of galls, number of juveniles, egg-masses, eggs, females, and total final population”
e1“management of M. incognita on eggplant”
Claim · model-written summary
Application of all the rhizosphere bacteria and their combinations reduced the number of eggs, females and total final population of M. incognita on eggplant.
- Taxon
- eggplantSolanum melongenae1
- Treatment
- all the rhizosphere bacteria and their combinationse0
- Interactor
- M. incognitaMeloidogyne incognitae1pathogen
- Outcome
- eggs, females, and total final populatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of all the rhizosphere bacteria and their combinations reduced the number of galls, number of juveniles, egg-masses, eggs, females, and total final population”
e1“management of M. incognita on eggplant”
Claim · model-written summary
All bio-agent treatments improved the plant growth parameters of eggplant.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- All bio-agent treatmentse0
- Outcome
- plant growth parameterse0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All bio-agent treatments succeeded in improving the plant growth parameters and increased the microbial density in eggplant rhizosphere”
Claim · model-written summary
All bio-agent treatments increased the microbial density in the eggplant rhizosphere.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- All bio-agent treatmentse0
- Outcome
- microbial densitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All bio-agent treatments succeeded in improving the plant growth parameters and increased the microbial density in eggplant rhizosphere”
The same questions in other papers
inoculation · Meloidogyne incognita · Solanum melongena (eggplant)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
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See all 7 papers →biocontrol · growth · Solanum melongena (eggplant)Results agree
9 papers in the same direction as this paper
- positive
- positive
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See all 10 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.