Isolation, identification, and plant growth-promoting mechanisms of strain BN5, with a focus on exogenously Trp-independent IAA biosynthesis, and its impact on cucumber cultivation
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View abstract on PubMed
Summary
This summary is machine-generated.This study reveals Niallia taxi BN5 enhances cucumber growth and yield by producing indole-3-acetic acid (IAA) independently of external tryptophan. This bacterium shows potential for sustainable agriculture and microbial fertilizers.
Area Of Science
- Microbiology
- Plant Science
- Biotechnology
Background
- The genus Niallia, recently diverged from Bacillus, has underexplored plant growth-promoting capabilities.
- Understanding the mechanisms behind Niallia's plant growth promotion is crucial for agricultural applications.
Purpose Of The Study
- To investigate the plant growth-promoting potential of Niallia taxi BN5 in cucumber cultivation.
- To elucidate the role of tryptophan in indole-3-acetic acid (IAA) synthesis and regulation by BN5.
- To assess the impact of BN5 on cucumber growth, yield, quality, soil enzymes, and microbial communities.
Main Methods
- Pot and greenhouse experiments were conducted to evaluate BN5's effects on cucumber.
- Genome analysis, transcriptome sequencing, and quantitative PCR (qPCR) were used to study gene expression related to IAA biosynthesis and motility.
- Soil enzyme activities and rhizosphere microbial community structure were analyzed.
Main Results
- BN5 significantly improved cucumber growth parameters, yield, and quality (Vitamin C, soluble sugar).
- BN5 enhanced soil enzyme activities (urease, dehydrogenase) and altered microbial community structure.
- Strain BN5 possesses a complete tryptophan synthase operon enabling tryptophan-independent IAA production (17.64 μg/mL).
- Exogenous tryptophan modulated gene expression, indicating adaptive regulation.
Conclusions
- Niallia taxi BN5 is an effective plant growth promoter for cucumber, primarily through tryptophan-mediated IAA biosynthesis.
- The strain's ability to produce IAA independently of exogenous tryptophan highlights its robustness.
- BN5 demonstrates significant potential for developing microbial fertilizers and advancing sustainable agriculture.
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