Abstract
Actinobacteria have shown significant potential in promoting the growth of various plant species, especially those that inhabit in association with plants. However, previous research has mainly focused on higher plant species. Bryophytes are a large group of non-vascular, non-flowering land plants without true vascular bundles, roots, stems, and leaves. Despite the extensive diversity of bryophytes in Thailand, research on the diversity of actinobacteria associated with bryophytes remains scarce. This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand: Koponobryum papillosum Printarakul & Chantanaorr, Pseudotrismegistia undulata, and Sphagnum cuspidatulum C. Müll. A total of 52 isolates were identified, including 6 endophytic and 46 epiphytic isolates. These isolates were assigned to four genera: Brevibacterium (1 isolate), Microbacterium (1 isolate), Rhodococcus (6 isolates), and Streptomyces (44 isolates). All isolates were assessed for their plant-growth promoting abilities both in vitro and in planta. Most actinobacteria exhibited the in vitro ability to produce indole-3-acetic acid (IAA), siderophores, and solubilize tricalcium phosphate. Three isolates-Streptomyces brevispora RHP2, S. halstedii WS1, and Rhodococcus triatomae RHK22-were selected to evaluate their potential to enhance the growth of S. cuspidatulum C. Müll in soil. R. triatomae RHK22 was highly effective in promoting the regeneration of new shoots and significantly enhancing thallus height, fresh weight, dry weight, total chlorophyll content, and total carotenoid content (p < 0.05) of S. cuspidatulum C. Müll when applied as cell suspension and cell free supernatant.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
A total of 52 actinobacteria isolates were obtained from the bryophytes, 6 endophytic and 46 epiphytic.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e1“A total of 52 isolates were identified, including 6 endophytic and 46 epiphytic isolates”
Claim · model-written summary
Streptomyces accounted for 44 of the isolates.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e2“These isolates were assigned to four genera: Brevibacterium (1 isolate), Microbacterium (1 isolate), Rhodococcus (6 isolates), and Streptomyces (44 isolates)”
Claim · model-written summary
Rhodococcus accounted for 6 of the isolates.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e2“These isolates were assigned to four genera: Brevibacterium (1 isolate), Microbacterium (1 isolate), Rhodococcus (6 isolates), and Streptomyces (44 isolates)”
Claim · model-written summary
Brevibacterium was represented by 1 isolate.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e2“These isolates were assigned to four genera: Brevibacterium (1 isolate), Microbacterium (1 isolate), Rhodococcus (6 isolates), and Streptomyces (44 isolates)”
Claim · model-written summary
Microbacterium was represented by 1 isolate.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e2“These isolates were assigned to four genera: Brevibacterium (1 isolate), Microbacterium (1 isolate), Rhodococcus (6 isolates), and Streptomyces (44 isolates)”
Claim · model-written summary
Most actinobacteria produced IAA, siderophores and solubilized tricalcium phosphate in vitro.
Verbatim
e0“This study aimed to isolate actinobacteria from three bryophyte species in northern Thailand”
e3“Most actinobacteria exhibited the in vitro ability to produce indole-3-acetic acid (IAA), siderophores, and solubilize tricalcium phosphate”
Claim · model-written summary
Rhodococcus triatomae RHK22 promoted regeneration of new shoots of Sphagnum cuspidatulum.
- Taxon
- S. cuspidatulumSphagnum cuspidatulume4
- Treatment
- R. triatomae RHK22e4
- Interactor
- R. triatomae RHK22Rhodococcus triatomaee4symbiont
- Outcome
- regeneration of new shootse4
- Direction
- promotinge4
- Qualifier
- when applied as cell suspension and cell free supernatante4
Not reportedComparator
Verbatim
e4“R. triatomae RHK22 was highly effective in promoting the regeneration of new shoots and significantly enhancing thallus height, fresh weight, dry weight, total chlorophyll content, and total carotenoid content (p < 0.05) of S. cuspidatulum C. Müll when applied as cell suspension and cell free supernatant”
Claim · model-written summary
Rhodococcus triatomae RHK22 significantly enhanced thallus height, fresh weight and dry weight of Sphagnum cuspidatulum.
- Taxon
- S. cuspidatulumSphagnum cuspidatulume4
- Treatment
- R. triatomae RHK22e4
- Interactor
- R. triatomae RHK22Rhodococcus triatomaee4symbiont
- Outcome
- thallus height, fresh weight, dry weighte4
- Direction
- enhancinge4
- Qualifier
- p < 0.05e4
Not reportedComparator
Verbatim
e4“R. triatomae RHK22 was highly effective in promoting the regeneration of new shoots and significantly enhancing thallus height, fresh weight, dry weight, total chlorophyll content, and total carotenoid content (p < 0.05) of S. cuspidatulum C. Müll when applied as cell suspension and cell free supernatant”
Claim · model-written summary
Rhodococcus triatomae RHK22 significantly enhanced total chlorophyll and total carotenoid content of Sphagnum cuspidatulum.
- Taxon
- S. cuspidatulumSphagnum cuspidatulume4
- Treatment
- R. triatomae RHK22e4
- Interactor
- R. triatomae RHK22Rhodococcus triatomaee4symbiont
- Outcome
- total chlorophyll content, and total carotenoid contente4
- Direction
- enhancinge4
- Qualifier
- p < 0.05e4
Not reportedComparator
Verbatim
e4“R. triatomae RHK22 was highly effective in promoting the regeneration of new shoots and significantly enhancing thallus height, fresh weight, dry weight, total chlorophyll content, and total carotenoid content (p < 0.05) of S. cuspidatulum C. Müll when applied as cell suspension and cell free supernatant”