Abstract
Continuous cropping often leads to plant diseases caused by root-knot nematodes (RKN). Owing to the difficulty in laboratory culture of RKN, microbial biocontrol agents are mainly screened for through contact killing assay, which requires a substantial effort to acquire RKN. This study was undertaken to verify the feasibility of using Caenorhabditis elegans – a model nematode that can be easily grown in the laboratory – to screen for microbial antagonists against RKN. Tomato (Solanum lycopersicum L. cv. Houpi Maofen 802) plants were grown in pots containing RKN-infested soil with and without inoculation of an antagonistic actinobacterial strain, designated Streptomyces albidoflavus T4. Exposure to T4 culture filtrate that contained catecholate siderophore and indole acetic acid resulted in a mortality rate of 95.4% for C. elegans and increased seed vigor by 113% for tomato. While root rotting rate and RKN incidence decreased following T4 inoculation, plant survival rate and stem diameter increased correspondingly. The root-associated microbiota of inoculated plants were optimized, as indicated by increased proportions of potentially beneficial bacteria (e.g. Bacillus amyloliquefaciens) and decreased proportions of pathogenic fungi (e.g. Fusarium oxysporum). The results demonstrate the outstanding performance of S. albidoflavus T4 to control root-knot disease and benefit tomato plant growth through multifaceted mechanisms.
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Claims 7
Claim · model-written summary
T4 culture filtrate increased tomato seed vigor by 113%.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- T4 culture filtratee0
- Interactor
- T4
Tequatrovirus T4e0biocontrol_agent - Outcome
- seed vigore0
- Direction
- increasede0
- Value
- 113%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to T4 culture filtrate that contained catecholate siderophore and indole acetic acid resulted in a mortality rate of 95.4% for C. elegans and increased seed vigor by 113% for tomato.”
Claim · model-written summary
T4 inoculation decreased tomato root rotting rate.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- T4 inoculatione0
- Interactor
- T4Tequatrovirus T4e0biocontrol_agent
- Outcome
- root rotting ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While root rotting rate and RKN incidence decreased following T4 inoculation, plant survival rate and stem diameter increased correspondingly.”
t0“tomato”
Claim · model-written summary
T4 inoculation decreased root-knot nematode incidence in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- T4 inoculatione0
- Interactor
- RKNe0pathogen
- Second interactor
- T4Tequatrovirus T4e0biocontrol_agent
- Outcome
- RKN incidencee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While root rotting rate and RKN incidence decreased following T4 inoculation, plant survival rate and stem diameter increased correspondingly.”
t0“tomato”
Claim · model-written summary
T4 inoculation increased tomato plant survival rate and stem diameter.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- T4 inoculatione0
- Interactor
- T4Tequatrovirus T4e0biocontrol_agent
- Outcome
- plant survival rate and stem diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While root rotting rate and RKN incidence decreased following T4 inoculation, plant survival rate and stem diameter increased correspondingly.”
t0“tomato”
Claim · model-written summary
T4 inoculation increased potentially beneficial Bacillus amyloliquefaciens in tomato root microbiota.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- inoculatede0
- Interactor
- Bacillus amyloliquefaciens
.jpg?width=60)
Bacillus amyloliquefaciense0symbiont - Outcome
- proportions of potentially beneficial bacteriae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The root-associated microbiota of inoculated plants were optimized, as indicated by increased proportions of potentially beneficial bacteria (e.g. Bacillus amyloliquefaciens) and decreased proportions of pathogenic fungi (e.g. Fusarium oxysporum).”
t0“tomato”
Claim · model-written summary
T4 inoculation decreased pathogenic Fusarium oxysporum in tomato root microbiota.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- inoculatede0
- Interactor
- Fusarium oxysporum
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume0pathogen - Outcome
- proportions of pathogenic fungie0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=500)
Verbatim
e0“The root-associated microbiota of inoculated plants were optimized, as indicated by increased proportions of potentially beneficial bacteria (e.g. Bacillus amyloliquefaciens) and decreased proportions of pathogenic fungi (e.g. Fusarium oxysporum).”
t0“tomato”
Claim · model-written summary
T4 culture filtrate caused 95.4% C. elegans mortality as a screening indicator for tomato disease control.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- T4 culture filtratee0
- Interactor
- C. elegans
Caenorhabditis eleganse0other - Outcome
- mortality rate of 95.4% for C. eleganse0
- Value
- 95.4%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to T4 culture filtrate that contained catecholate siderophore and indole acetic acid resulted in a mortality rate of 95.4% for C. elegans and increased seed vigor by 113% for tomato.”
t0“tomato”
The same questions in other papers
inoculation · Fusarium oxysporum · Solanum lycopersicum (tomato)Positive and negative results
21 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- no effect
22 papers more in this group
See all 26 papers →inoculation · disease · Solanum lycopersicum (tomato)Positive and negative results
135 papers in the same direction as this paper · 128 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
262 papers more in this group
See all 266 papers →inoculation · Bacillus amyloliquefaciens · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- positive
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.