Abstract
A total of 30 isolates of actinomycetes were isolated from the rhizosphere soils of groundnut collected from different parts of Tamil Nadu, India and tested for their inhibitory activity against Sclerotium rolfsii Sacc., the stem rot pathogen of groundnut. Among the various isolates tested in vitro, five isolates (CBE, MDU, PDK, ANR and SA) were found effective in inhibiting the mycelial growth of S. rolfsii in dual culture assay. These isolates were identified as Streptomyces sp. on the basis of standard bacteriological tests and 16S ribosomal RNA gene sequence analysis. Groundnut seeds when treated with Streptomyces sp. strains showed significant increases in root length, shoot length and seedling vigour. Talc-based powder formulations of the Streptomyces sp. strains, CBE, MDU and PDK selected on the basis of their in vitro antagonism on dual plate technique and plant-growth promoting activity were prepared and tested for their efficacy in controlling stem rot of groundnut under greenhouse and field conditions. Seed treatment and soil application of Streptomyces sp. strains CBE, MDU and PDK significantly reduced the incidence of stem rot under greenhouse and field conditions. The highest pod yield was recorded in plots treated with Streptomyces sp. strain CBE when compared to other strains.
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Claims 5
Claim · model-written summary
Five actinomycete isolates inhibited S. rolfsii mycelial growth in dual culture.
- Taxon
- S. rolfsii
Agroathelia rolfsiie0 - Material
- CBE, MDU, PDK, ANR and SAe0
- Outcome
- mycelial growth of S. rolfsiie0
- Direction
- inhibitinge0
- Setting
- dual culture assaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five isolates (CBE, MDU, PDK, ANR and SA) were found effective in inhibiting the mycelial growth of S. rolfsii in dual culture assay.”
Claim · model-written summary
The five active isolates were identified as Streptomyces sp.
- Taxon
- Streptomyces sp.
Streptomyces sp.e0 - Outcome
- identified as Streptomyces sp.e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These isolates were identified as Streptomyces sp. on the basis of standard bacteriological tests and 16S ribosomal RNA gene sequence analysis.”
Claim · model-written summary
Streptomyces sp. seed treatment significantly increased groundnut root length, shoot length, and seedling vigour.
- Taxon
- Groundnut
Arachis hypogaeae0 - Treatment
- treated with Streptomyces sp. strainse0
- Interactor
- Streptomyces sp.Streptomyces sp.e0biocontrol_agent
- Outcome
- root length, shoot length and seedling vigoure0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Groundnut seeds when treated with Streptomyces sp. strains showed significant increases in root length, shoot length and seedling vigour.”
Claim · model-written summary
Seed treatment and soil application of CBE, MDU, and PDK significantly reduced groundnut stem rot incidence under greenhouse and field conditions.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- Seed treatment and soil application of Streptomyces sp. strains CBE, MDU and PDKe0
- Interactor
- Sclerotium rolfsiiAgroathelia rolfsiit0pathogen
- Second interactor
- Streptomyces sp.Streptomyces sp.e0biocontrol_agent
- Outcome
- incidence of stem rote0
- Direction
- reducede0
- Setting
- greenhouse and field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed treatment and soil application of Streptomyces sp. strains CBE, MDU and PDK significantly reduced the incidence of stem rot under greenhouse and field conditions.”
t0“stem rot of groundnut (Arachis hypogaeaL.) caused bySclerotium rolfsiiSacc.”
Claim · model-written summary
CBE treatment gave the highest pod yield compared with other strains.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- Streptomyces sp. strain CBEe0
- Interactor
- Streptomyces sp.Streptomyces sp.e0biocontrol_agent
- Outcome
- pod yielde0
- Direction
- higheste0
- Comparator
- other strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest pod yield was recorded in plots treated with Streptomyces sp. strain CBE when compared to other strains.”
t0“groundnut (Arachis hypogaeaL.)”
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