Genomic Analysis of Endophytic Bacillus cereus T4S and Its Plant Growth-Promoting Traits
Abstract
:1. Introduction
2. Results
2.1. Biochemical and Cultural Features
2.2. Whole Genome Sequencing Analysis
2.3. Predicted Secondary Metabolite Cluster Genes by antiSMASH
2.4. Effect of Bacterial Inoculation on Sunflower Yield
3. Discussion
4. Materials and Methods
4.1. Isolation of Sunflower Root Endosphere Associated Endophytic Bacterium, B. cereus T4S
4.2. Morphological and Biochemical Characterization of Bacterial Isolate
4.3. DNA Extraction, Polymerase Chain Reaction, and Molecular Identification of the Bacterial Isolate
4.4. Whole-Genome Sequencing (WGS)
4.5. Plant Growth-Promoting Screening
4.5.1. Phosphate Solubilization Screening
4.5.2. Siderophore Screening
4.5.3. Exopolysaccharide (EPS) Test
4.5.4. Indole Acetic Acid Production
4.6. Inoculum Preparation and Seed Treatment for the Greenhouse Experiment
4.6.1. Inoculum Preparation and Seed Treatment
4.6.2. Greenhouse Experimental Study
4.6.3. Sunflower Morphological Parameters Below-and-Above-Ground Level
4.6.4. Determination of Sunflower Yield Parameters
4.6.5. Soil Variable Analysis
4.7. Statistical Analysis
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Test | Plant Growth-Promoting Traits | ||||
---|---|---|---|---|---|
IAA (µg/mL) | Siderophore (%) | Phosphate (µg/mL) | Exopolysaccharide | ||
Qualitative | + | ++ | + | +++ | |
Quantitative | 11.29 ± 0.01 a | 87.30 ± 0.38 c | 30.43 ± 0.18 b | ND | |
Test | Enzyme Assay | ||||
Amylase | Cellulase | Xylanase | Mannanase | Protease | |
Qualitative | − | ++ | ++ | ++ | + |
ZOC (mm) | 0 ± 0.00 a | 50.00 ± 0.01 d | 180.00 ± 0.01 e | 35.00 ± 0.01 c | 4.00 ± 0.01 b |
Pathway | Gene | Product | Locus Tag |
---|---|---|---|
Nitrogen fixation | nif3-like | nitrogen fixation protein Nif3-like | HWX41_RS02785/HWX41_RS08235/HWX41_RS00530 |
nifU | nitrogen fixation protein NifU | HWX41_RS22890 | |
nif | Flavodoxin | HWX41_RS17075 | |
Nitrogen metabolism | gltP | glutamate/aspartate: proton symporter GltP | HWX41_RS16800 |
gltX | Glutamate—tRNA ligase | HWX41_RS26220 | |
glnR | transcriptional repressor GlnR | HWX41_RS05880 | |
glnA glnH | type I glutamate—ammonia ligase/glutamine ABC transporter substrate-binding protein GlnH | HWX41_RS05885 HWX41_RS23555 | |
Nitrogen regulation | nadR | transcription repressor NadR | HWX41_RS02105 |
Dissimilatory nitrate reduction | nirB nirD | nitrite reductase (NADH) large subunit nitrate reductase (NADH) small subunit | HWX41_RS13635 HWX41_RS13640 |
narI | respiratory nitrate reductase subunit gamma | HWX41_RS13700 | |
NarH narJ | nitrate reductase subunit beta/nitrate reductase molybdenum cofactor assembly chaperone | HWX41_RS13710 HWX41_RS13705 | |
nar | nitrate reductase subunit alpha | HWX41_RS13715 | |
nar | nitrate reductase | HWX41_RS13945 | |
nark | nitrate transporter | HWX41_RS13665 | |
Ammonia assimilation | gltX | glutamate-tRNA ligase | HWX41_RS26220 |
gltP | glutamate/aspartate: proton symporter GltP | HWX41_RS16800 |
Pathway | Gene | Product | Locus Tag |
---|---|---|---|
Degradation of phosphonates | phnC phnF | phosphonate transport system ATP-binding phosphonate metabolism transcriptional regulator phnF phosphonate transport system permease protein | HWX41_RS05935 HWX41_RS04040 |
phnE | phosphonate transport system permease protein | HWX41_RS05940/HWX41_RS05945 | |
ispH | 4-hydroxy-3-methylbut-2-enyl diphosphate reductase | HWX41_RS02790 | |
Phosphate transport | phn | phosphate/phosphite/phosphonate ABC transporter substrate-binding protein | HWX41_RS05930 |
pstC pstS pstS | phosphate transport system permease phosphate transport system substrate-binding protein phosphate transport system substrate-binding protein | HWX41_RS23195 HWX41_RS02875/HWX41_RS23200HWX41_RS02870 | |
pstB | phosphate transport system ATP-binding protein | HWX41_RS02885 | |
pstA | phosphate transport system permease protein | HWX41_RS23190/HWX41_RS02880 | |
phoU | phosphate signaling complex protein PhoU | HWX41_RS02890 | |
gltP | glycerol-3-phosphate transporter | HWX41_RS23465 | |
ugpC | sn-glycerol-3-phosphate ABC transporter ATP-binding protein UgpC | HWX41_RS04235/HWX41_RS23895 | |
phoH | phosphate starvation-inducible protein PhoH and related proteins | HWX41_RS02710 |
Pathway | Gene | Product | Locus Tag |
---|---|---|---|
Iron(III) transport | fbpA | fur-regulated basic protein FbpA | HWX41_RS15335/HWX41_RS19065 |
Iron(II) transport | fetB | ferrous iron transport protein A | HWX41_RS00335 |
fetB | iron export ABC transporter permease subunit FetB | HWX41_RS22925 | |
feoB | ferrous iron transport protein B | HWX41_RS00340 | |
Siderophore transport | fetB | siderophore ABC transporter substrate-binding protein | HWX41_RS24585 |
Pathway | Gene | Product | Locus Tag |
---|---|---|---|
ACC catabolism | acdA | acyl-CoA dehydrogenase AcdA | HWX41_RS21030 |
Potassium transport | kdpA | potassium-transporting ATPase subunit A | HWX41_RS15255 |
L-tryptophan production; IAA production | ND | tryptophan synthase subunit alpha | HWX41_RS17780 |
trpB | tryptophan synthase subunit beta | HWX41_RS17785 | |
trpC | indole-3-glycerol phosphate synthase TrpC | HWX41_RS17795 | |
trpD | anthranilate phosphoribosyltransferase | HWX41_RS17800 | |
trpE | anthranilate synthase component I | HWX41_RS17810 | |
trpS | Tryptophan—tRNA ligase | HWX41_RS18055 | |
IAA production, IPA pathway | dhaS | aldehyde dehydrogenase DhaS | HWX41_RS06485 |
dha | aldehyde dehydrogenase | HWX41_RS25615 | |
dha | acetaldehyde dehydrogenase (acetylating) | HWX41_RS13995 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS19325 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS06850 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS10480 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS13000 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS17225 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS17590 | |
dha | aldehyde dehydrogenase family protein | HWX41_RS14005 | |
CK biosynthesis and transformation | miaA | tRNA (adenosine(37)-N6)-dimethylallyltransferase MiaA | HWX41_RS05835 |
Ammonia production | nadE | ammonia-dependent NAD(+) synthetase | HWX41_RS14365 |
Node Rg | From | To | MSKC | Type | Similarity | |
---|---|---|---|---|---|---|
Rg 1.1 | 28,953 | 42,560 | Petrobactin | Other | Siderophore | 100% |
Rg 3.1 | 93,263 | 140,279 | NRPS | |||
Rg 3.2 | 155,248 | 165,496 | RiPP-like | |||
Rg 21.1 | 20,448 | 75,995 | NRPS | |||
Rg 28.1 | 22,582 | 65,892 | Bacillibactin | NRP | NRPS | 46% |
Rg 35.1 | 1 | 57,852 | Bacitracin | NRP | NRPS | 100% |
Rg 42.1 | 16,640 | 38,493 | Molybdenum cofactor | Other | Terpene | 17% |
Rg 46.1 | 1 | 45,939 | Zwittermicin A | NRP + Polyketide | NRPS, T1PKS | 77% |
Rg 62.1 | 5236 | 34,100 | NRPS-like | |||
Rg 71.1 | 8999 | 19,310 | RiPP-like | |||
Rg 86.1 | 1 | 23,433 | NRPS | |||
Rg 87.1 | 1 | 17,771 | LAP, RiPP-like | |||
Rg 89.1 | 1 | 22,451 | Zwittermicin A | NRP + Polyketide | NRPS, T1PKS | 7% |
Rg 91.1 | 7584 | 22,279 | Fengycin | NRP | Betalactone | 20% |
Level | Growth Parameter | Non-Inoculated | Inoculated with B. cereus T4S |
---|---|---|---|
Belowground | Tap root length (cm) | 146.67 ± 58.33 a | 158.33 ± 40.20 b |
Tap root width (cm) | 5.33 ± 0.58 a | 7.00 ± 1.00 b | |
Root length (cm) | 217 ± 81.22 a | 339.67 ± 82.78 b | |
Lateral root number | 25.67 ± 1.53 a | 29.67 ± 1.53 b | |
Root wet weight (g) | 44.09 ± 16.12 a | 65.54 ± 18.41 b | |
Root dry weight (g) | 8.41 ± 1.55 a | 11.43 ± 5.44 b | |
Number of roots | 935 ± 11.30 a | 1209.67 ± 348.26 b | |
Aboveground | Seed wet weight (g) | 0.05 ± 0.01 a | 0.25 ± 0.33 b |
Seed dry weight (g) | 0.03 ± 0.01a | 0.035 ± 0.00 a | |
Head fresh weight (g) | 153.76 ± 13.94 a | 165.50 ± 7.55 b | |
Head dry weight (g) | 41.55 ± 4.27 a | 45.92 ± 13.33 b | |
Plant wet weight dry (g) | 331.04 ± 20.16 a | 392.69 ± 8.70 b | |
Shoot wet weight (g) | 165.82 ± 5.16 a | 183.55 ± 13.75 b | |
Shoot dry weight (g) | 57.28 ± 7.04 a | 68.24 ± 22.13 b |
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Adeleke, B.S.; Ayangbenro, A.S.; Babalola, O.O. Genomic Analysis of Endophytic Bacillus cereus T4S and Its Plant Growth-Promoting Traits. Plants 2021, 10, 1776. https://doi.org/10.3390/plants10091776
Adeleke BS, Ayangbenro AS, Babalola OO. Genomic Analysis of Endophytic Bacillus cereus T4S and Its Plant Growth-Promoting Traits. Plants. 2021; 10(9):1776. https://doi.org/10.3390/plants10091776
Chicago/Turabian StyleAdeleke, Bartholomew Saanu, Ayansina Segun Ayangbenro, and Olubukola Oluranti Babalola. 2021. "Genomic Analysis of Endophytic Bacillus cereus T4S and Its Plant Growth-Promoting Traits" Plants 10, no. 9: 1776. https://doi.org/10.3390/plants10091776