ORIGINAL ARTICLE
Organic soil-derived Saccharopolyspora thermophila for enhancing plant growth and controlling Fusarium wilt disease in tomato
1
Department of Studies and Research in Environmental Science, Tumkur University, Tumakuru, India
2
Department of Studies and Research in Biotechnology and Microbiology, Tumkur University, Tumakuru, India
3
Department of Environmental Science, Central University of Kerala, Tejaswini Hills, Periye, India
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Submission date: 2024-10-10
Acceptance date: 2025-06-23
Online publication date: 2026-03-09
Corresponding author
Sharatchchandra Ramasandra Govind
Department of Studies and Research in Biotechnology and Microbiology, Tumkur University, Tumakuru, India
Department of Studies and Research in Biotechnology and Microbiology, Tumkur University, Tumakuru, India
HIGHLIGHTS
- PGPA treatment significantly reduced disease, and increased plant health
- This work lays a solid basis for the creation of S. thermophila-based bioinoculants
- PGPA are natural control agents for potential and sustainable agriculture
KEYWORDS
anti-oxidant enzymeschlorophyllFusarium oxysporumlipid peroxidationPGPASaccharopolyspora thermophilasucrosestarch
TOPICS
ABSTRACT
This study investigated the effects of Saccharopolyspora thermophila, a plant growth-promoting
actinomycete (PGPA), on tomato plants (Suvarna 22) and its potential to mitigate
Fusarium wilt disease. Saccharopolyspora thermophila was isolated from organic farm soil
and molecularly identified through 16S rRNA sequencing. Seed treatment with S. thermophila
significantly enhanced germination rates (83% vs 59% in control) and seedling
vigor (625 vs 192 in control). Treated plants exhibited improved growth parameters, including
increased plant height (83.3%), chlorophyll content (88.2%), and fruit yield (66.7%).
Under pathogen challenge, S. thermophila-treated plants showed reduced disease incidence
(37% vs 92% in untreated plants). Biochemical analyses revealed that S. thermophila treatment
enhanced antioxidant enzyme activities (CAT, SOD, APX, POD) and maintained
higher chlorophyll content under pathogen stress. The treatment also moderated pathogen-
induced increases in lipid peroxidation and proline levels, indicating improved stress
tolerance. Interestingly, S. thermophila treatment counteracted pathogen-induced starch
depletion and moderated sucrose accumulation, suggesting a complex interplay in plant
metabolism regulation. These findings demonstrated the potential of S. thermophila as
a PGPA to enhance tomato plant growth, productivity, and resilience against Fusarium
wilt disease. The study provides insights into the physiological and biochemical mechanisms
underlying PGPA-mediated plant growth promotion and disease resistance, offering
promising avenues for sustainable agricultural practices.
RESPONSIBLE EDITOR
Yi Zhou
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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