Abstract
Seven endosymbiotic actinobacteria were isolated from sand truffles (Terfezia leonis Tul.) harvested in the Hassi R’Mel region of the Algerian Sahara. Morphological characteristics and chemotaxonomical analysis indicated that all isolates were members of the Streptomyces genus. All the isolated actinobacteria were initially screened in vitro for antifungal capacities, chitinolytic activities, siderophore production, and synthesis of plant-growth regulators (indole-3-acetic acid and gibberellic acid). The isolate Streptomyces sp. TL7 exhibited a remarkable profile with positive results in all trials, while the others showed variable responses to assays. In vivo trials were then carried out with the isolates to evaluate their root colonization abilities and plant-growth-promoting potential on tomato (cv. Marmande) seedlings. The results showed that all these Streptomyces strains could be isolated successfully from inside the roots of inoculated tomato seedlings. However, the plant-growth-promoting effect varied depending on the treatment. Seeds surface-coated with spores of Streptomyces sp. strain TL7 showed the highest performance, with significantly increased (P < 0.05) shoot and root lengths, and seedling fresh and dry weights. The taxonomic position based on 16S rDNA sequence analysis and phylogenetic studies indicated that strain TL7 was related to Streptomyces neopeptinius KNF 2047T (99.0 % similarity). The interesting antifungal properties and plant-growth promotion traits shown by Streptomyces sp. strain TL7 may indicate a potential for its possible use as plant-growth-promoting agent, especially for tomato seedlings.
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Claims 7
Claim · model-written summary
All truffle actinobacterial isolates were Streptomyces.
- Taxon
- tomato
Solanum lycopersicume1 - Interactor
- Streptomyces
Streptomycese0symbiont - Outcome
- members of the Streptomyces genuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all isolates were members of the Streptomyces genus.”
e1“tomato (cv. Marmande) seedlings”
Claim · model-written summary
TL7 tested positive in all in vitro antifungal, chitinolytic, siderophore and growth-regulator assays.
- Taxon
- tomatoSolanum lycopersicume1
- Interactor
- Streptomyces sp. TL7Streptomyces sp. TL7e0symbiont
- Outcome
- positive results in all trialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The isolate Streptomyces sp. TL7 exhibited a remarkable profile with positive results in all trials”
e1“tomato (cv. Marmande) seedlings”
Claim · model-written summary
All inoculated Streptomyces strains colonized tomato seedling roots internally.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- inoculatede0
- Interactor
- StreptomycesStreptomycese0symbiont
- Outcome
- isolated successfully from inside the rootse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all these Streptomyces strains could be isolated successfully from inside the roots of inoculated tomato seedlings.”
Claim · model-written summary
The growth-promoting effect varied by treatment.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- plant-growth-promoting effecte0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant-growth-promoting effect varied depending on the treatment.”
e1“tomato (cv. Marmande) seedlings”
Claim · model-written summary
TL7-coated seeds produced significantly longer shoots and roots.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- Seeds surface-coated with spores of Streptomyces sp. strain TL7e0
- Interactor
- Streptomyces sp. strain TL7Streptomyces sp.e0symbiont
- Outcome
- shoot and root lengthse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds surface-coated with spores of Streptomyces sp. strain TL7 showed the highest performance, with significantly increased (P < 0.05) shoot and root lengths, and seedling fresh and dry weights.”
e1“tomato (cv. Marmande) seedlings”
Claim · model-written summary
TL7-coated seeds produced significantly greater fresh and dry seedling weight.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- Seeds surface-coated with spores of Streptomyces sp. strain TL7e0
- Interactor
- Streptomyces sp. strain TL7Streptomyces sp.e0symbiont
- Outcome
- seedling fresh and dry weightse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds surface-coated with spores of Streptomyces sp. strain TL7 showed the highest performance, with significantly increased (P < 0.05) shoot and root lengths, and seedling fresh and dry weights.”
e1“tomato (cv. Marmande) seedlings”
Claim · model-written summary
TL7 was related to Streptomyces neopeptinius KNF 2047T with 99.0% similarity.
- Taxon
- tomatoSolanum lycopersicume1
- Interactor
- Streptomyces neopeptinius KNF 2047TStreptomyces neopeptiniuse0symbiont
- Outcome
- related to Streptomyces neopeptinius KNF 2047Te0
- Value
- 99.0 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain TL7 was related to Streptomyces neopeptinius KNF 2047T (99.0 % similarity).”
e1“tomato (cv. Marmande) seedlings”
The same questions in other papers
Streptomyces · growth · Solanum lycopersicum (tomato)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.