Abstract
Plant pathogens can cause significant losses in plant production. To address this issue, it is crucial to develop innovative technologies that promote sustainability in production. One potential solution is the use of plant growth-promoting microorganisms, particularly those with biocontrol properties. In this study, root-endophytic actinomycetes isolated from Bromus auleticus, a South American forage grass, were investigated. Their ability to promote plant growth and their biocontrol activity against fungal phytopathogens were analysed. The actinomycetes were characterised molecularly, morphologically, and physiologically. Their ability to solubilise P, fixate N2, produce phytohormones, nitrate, siderophores, phenazines and lytic enzymes was assessed. Both in vitro dual-antagonistic and in vivo biocontrol assays were performed. The strains were identified as species of the Micromonospora and Microbispora genus. They were able to produce auxins, solubilise phosphorus and release lytic enzymes, and nitrate. In vitro, both species of Micromonospora aff. halotolerans reduced the growth of fungal phytopathogens by 12%–34%. In particular, the strain Micromonospora aff. halotolerans TWB21 was found to reduce the pre-emergence effects of Fusarium oxysporum growth when the actinomycete was inoculated by seed immersion. Moreover, this strain improved the seed emergence, plant establishment and plant growth parameters under biotic stress. These results remark the importance of endophytic actinomycetes with biocontrol and plant growthpromoting abilities in enhancing their host establishment and biomass production. This reinforces the idea that Micromonospora strains could be applied as biocontrol agents on grasses with agronomic interest.
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Claims 6
Claim · model-written summary
The strains were identified as Micromonospora and Microbispora species.
- Taxon
- Micromonospora
Micromonosporae0 - Outcome
- identified as species of the Micromonospora and Microbispora genuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The strains were identified as species of the Micromonospora and Microbispora genus.”
Claim · model-written summary
The strains produced auxins, solubilized phosphorus, and released lytic enzymes and nitrate.
- Taxon
- MicromonosporaMicromonosporae1
- Outcome
- produce auxins, solubilise phosphorus and release lytic enzymes, and nitratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They were able to produce auxins, solubilise phosphorus and release lytic enzymes, and nitrate.”
e1“The strains were identified as species of the Micromonospora and Microbispora genus.”
Claim · model-written summary
Two Micromonospora aff. halotolerans species reduced fungal pathogen growth in vitro by 12%–34%.
- Taxon
- fungal phytopathogense0
- Treatment
- Micromonospora aff. halotoleranse0
- Outcome
- growth of fungal phytopathogense0
- Direction
- reducede0
- Value
- 12%–34%e0
Not reportedComparator
Verbatim
e0“In vitro, both species of Micromonospora aff. halotolerans reduced the growth of fungal phytopathogens by 12%–34%.”
Claim · model-written summary
Seed immersion inoculation with Micromonospora TWB21 reduced pre-emergence effects of Fusarium oxysporum.
- Taxon
- Bromus auleticus
Bromus auleticuse1 - Treatment
- actinomycete was inoculated by seed immersione0
- Interactor
- Fusarium oxysporum
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume0pathogen - Second interactor
- Micromonospora aff. halotolerans TWB21e0biocontrol_agent
- Outcome
- pre-emergence effects of Fusarium oxysporum growthe0
- Direction
- reducee0
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 strain Micromonospora aff. halotolerans TWB21 was found to reduce the pre-emergence effects of Fusarium oxysporum growth when the actinomycete was inoculated by seed immersion”
e1“Bromus auleticus”
Claim · model-written summary
The strain improved seed emergence, establishment and growth under biotic stress.
- Taxon
- Bromus auleticusBromus auleticuse2
- Treatment
- Micromonospora aff. halotolerans TWB21e1
- Interactor
- Micromonospora aff. halotolerans TWB21e1symbiont
- Outcome
- seed emergence, plant establishment and plant growth parameterse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this strain improved the seed emergence, plant establishment and plant growth parameters under biotic stress.”
e1“the strain Micromonospora aff. halotolerans TWB21”
e2“Bromus auleticus”
Claim · model-written summary
The authors propose Micromonospora strains as biocontrol agents on agronomic grasses.
- Taxon
- grassese0
- Interactor
- MicromonosporaMicromonosporae0biocontrol_agent
- Outcome
- applied as biocontrol agentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Micromonospora strains could be applied as biocontrol agents on grasses with agronomic interest.”