Abstract
Biological control of plant pathogens is assuming increasing importance in organic and low input sustainable agriculture. Forty one Actinobacterial strains isolated from the arid, semi arid and humid regions of Rajasthan, Karnataka, Andhra Pradesh in India were tested for their antagonism to four plant pathogenic fungi viz., Macrophomina phaseolina, Sclerotium rolfsii, Rhizoctonia solani and Fusarium oxysporum. The Streptomyces strains from humid regions were more effective in inhibiting mycelial growth of Macrophomina phaseolina (62.8%). Arid and semi arid region strains (40.8 and 40.6%) were almost similar in inhibiting mycelial growth of Sclerotium rolfsii compared to humid region strains. Semi arid region strains (24.2%) were more effective in inhibiting the mycelial growth of Rhizoctonia solani followed by arid and humid region strains. However only the arid region strains (44.5%) showed inhibition towards Fusarium oxysporum. The strains with best antogonistic ability (10 no.s) also exhibited other plant growth promoting traits like production of Indole acetic acid (1.9 - 5.7 mg ml-1) and Gibberellic acid (24.1-41.4 mg ml-1). All the strains except Streptomyces A30 could solubilize P from inorganic tri-calcium phosphate. The amount of P solubilization ranged from 3.2 - 6.8%. All the strains except Streptomyces A40 produced alkaline phosphatase which ranged from 60.0-160.9 µg p-nitrophenol/ml /h. Some strains produced ammonia whereas none of the strains produced HCN, siderophore or exhibited chitinase activity. In a glass house evaluation in soil microcosms, among the ten strains Streptomyces A6 was found best for promoting maize and Streptomyces A17 for chickpea growth.
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Claims 13
Claim · model-written summary
Streptomyces strains from humid regions inhibited Macrophomina phaseolina mycelial growth by 62.8%.
- Treatment
- Streptomyces strains from humid regionse1
- Interactor
- Macrophomina phaseolina
Macrophomina phaseolinae1pathogen - Second interactor
- Streptomyces
Streptomycese1biocontrol_agent - Outcome
- inhibiting mycelial growth of Macrophomina phaseolinae1
- Value
- 62.8%e1
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The Streptomyces strains from humid regions were more effective in inhibiting mycelial growth of Macrophomina phaseolina (62.8%)”
Claim · model-written summary
Arid and semi-arid region strains inhibited Sclerotium rolfsii mycelial growth by 40.8%, almost similar to humid region strains.
- Treatment
- Arid and semi arid region strainse2
- Interactor
- Sclerotium rolfsii
Agroathelia rolfsiie2pathogen - Outcome
- inhibiting mycelial growth of Sclerotium rolfsiie2
- Value
- 40.8e2
- Qualifier
- almost similare2
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Arid and semi arid region strains (40.8 and 40.6%) were almost similar in inhibiting mycelial growth of Sclerotium rolfsii compared to humid region strains”
Claim · model-written summary
Arid and semi-arid region strains inhibited Sclerotium rolfsii mycelial growth by 40.6%, almost similar to humid region strains.
- Treatment
- Arid and semi arid region strainse2
- Interactor
- Sclerotium rolfsiiAgroathelia rolfsiie2pathogen
- Outcome
- inhibiting mycelial growth of Sclerotium rolfsiie2
- Value
- 40.6%e2
- Qualifier
- almost similare2
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Arid and semi arid region strains (40.8 and 40.6%) were almost similar in inhibiting mycelial growth of Sclerotium rolfsii compared to humid region strains”
Claim · model-written summary
Semi-arid region strains inhibited Rhizoctonia solani mycelial growth by 24.2%, more effective than arid and humid region strains.
- Treatment
- Semi arid region strainse3
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie3pathogen - Outcome
- inhibiting the mycelial growth of Rhizoctonia solanie3
- Direction
- more effectivee3
- Value
- 24.2%e3
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Semi arid region strains (24.2%) were more effective in inhibiting the mycelial growth of Rhizoctonia solani followed by arid and humid region strains”
Claim · model-written summary
Arid region strains showed inhibition towards Fusarium oxysporum of 44.5%.
- Treatment
- arid region strainse4
- Interactor
- Fusarium oxysporum
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume4pathogen - Outcome
- inhibition towards Fusarium oxysporume4
- Value
- 44.5%e4
Not reportedTaxon
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
e4“only the arid region strains (44.5%) showed inhibition towards Fusarium oxysporum”
Claim · model-written summary
The best antagonistic strains produced indole acetic acid at 1.9 to 5.7 mg ml-1.
Not reportedTaxon
Verbatim
e5“production of Indole acetic acid (1.9 - 5.7 mg ml-1) and Gibberellic acid (24.1-41.4 mg ml-1)”
Claim · model-written summary
The best antagonistic strains produced gibberellic acid at 24.1 to 41.4 mg ml-1.
Not reportedTaxon
Verbatim
e5“production of Indole acetic acid (1.9 - 5.7 mg ml-1) and Gibberellic acid (24.1-41.4 mg ml-1)”
Claim · model-written summary
All strains except Streptomyces A30 solubilized P from tri-calcium phosphate by 3.2 to 6.8%.
Not reportedTaxon
Verbatim
e0“All the strains except Streptomyces A30 could solubilize P from inorganic tri-calcium phosphate”
e6“The amount of P solubilization ranged from 3.2 - 6.8%”
Claim · model-written summary
All strains except Streptomyces A40 produced alkaline phosphatase at 60.0 to 160.9 µg p-nitrophenol/ml/h.
Not reportedTaxon
Verbatim
e7“produced alkaline phosphatase which ranged from 60.0-160.9 µg p-nitrophenol/ml /h”
Claim · model-written summary
Some strains produced ammonia.
- Outcome
- produced ammoniae0
Not reportedTaxon
Verbatim
e0“Some strains produced ammonia whereas none of the strains produced HCN, siderophore or exhibited chitinase activity”
Claim · model-written summary
None of the strains produced HCN or siderophore or showed chitinase activity.
- Outcome
- HCN, siderophore or exhibited chitinase activitye0
Not reportedTaxon
Verbatim
e0“Some strains produced ammonia whereas none of the strains produced HCN, siderophore or exhibited chitinase activity”
Claim · model-written summary
In a glasshouse evaluation in soil microcosms, Streptomyces A6 was found best for promoting maize among the ten strains.
- Treatment
- Streptomyces A6e1
- Interactor
- Streptomyces A6e1symbiont
- Outcome
- promoting maizee1
- Direction
- beste1
- Comparator
- the ten strainse1
- Setting
- glass house evaluation in soil microcosmse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In a glass house evaluation in soil microcosms, among the ten strains Streptomyces A6 was found best for promoting maize”
Claim · model-written summary
In a glasshouse evaluation in soil microcosms, Streptomyces A17 was found best for chickpea growth among the ten strains.
- Taxon
- chickpea
Cicer arietinume2 - Treatment
- Streptomyces A17e2
- Interactor
- Streptomyces A17e2symbiont
- Outcome
- chickpea growthe2
- Direction
- beste1
- Comparator
- the ten strainse1
- Setting
- glass house evaluation in soil microcosmse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In a glass house evaluation in soil microcosms, among the ten strains Streptomyces A6 was found best for promoting maize”
e2“Streptomyces A17 for chickpea growth”
The same questions in other papers
Streptomyces · growth · Cicer arietinum (chickpea)Results agree
6 papers in the same direction as this paper
- positive
- positive
- 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.