Abstract
Phosphate-solubilizing bacteria (PSB) with plant growth promoting (PGP) traits enhance sustainable agriculture. Due to this, bacteria capable of promoting the growth of plants were isolated from rumen content of indigenous White Fulani cattle. The phosphate solubilizing potentials of the bacterial isolates and their plant growth promoting activities were assessed following standard techniques. The total bacterial population in the rumen contents ranged from 5.20 ± 0.36 × 105 to 4.00 ± 0.01 × 106 CFU g− 1). Out of 23 isolates, 61% exhibited varying P-solubilization efficiency which ranged between 144 µg mL− 1 and 687.75 µg mL− 1. Other plant growth promoting activities differed among bacterial isolates. The 16 S rRNA gene sequencing analysis confirmed 57% of the isolates that expressed multiple PGP ability as either Pseudomonas aeruginosa or Escherichia coli. Among the genus Escherichia, E. coli AKRC16 showed most promising result by liberating 345 µg mL− 1 soluble P. Overall, P. aeruginosa AKRC7 showed highest PGP activity (687.75 µg P mL− 1) at pH 4.2 after 120 h, IAA (39.27 µg mL− 1), ammonia (3.89 µmol mL− 1) and also displayed ability to fix nitrogen. P. aeruginosa AKRC7, E. coli AKRC16 and E. coli AKRC4 consistently, in that order, exhibited highest productivity for both enzymes at the same pH (6), incubation time (24 h), and optimal source of nitrogen and carbon for phosphatase (tryptone and starch) and phytase (peptone and glucose) correspondingly. Furthermore, P. aeruginosa AKRC7 and E. coli AKRC16 enhanced 100% germination of tomato seeds with significantly high vigour index (2177 and 2114.33) and P content (309.04 ± 0.05 mg g− 1 and 301.01 ± 0.02 mg g− 1) of seedlings respectively. The findings revealed rumen content as potential reservoir of prominent PGPB and presented P. aeruginosa AKRC7 (MK332569) and novel strains of E. coli AKRC4 (MK332563) and AKRC16 (MK332576) as promising candidate for bio-inoculation.
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Abbreviations
- P:
-
Phosphorus
- Pi:
-
Inorganic phosphate
- PSB:
-
Phosphate Solubilizing Bacteria
- PSM:
-
Phosphate Solubilizing Microorganisms
- PGP:
-
Plant Growth Promoting
- PGPM :
-
Plant Growth Promoting Microorganisms
- NBRIP :
-
National Botanical Research Institute’s Phosphate
- TCP:
-
Tricalcium phosphate
- CFU:
-
Colony Forming Unit
- SI:
-
Solubilization Index
- IAA:
-
Indole Acetic Acid
- HCN:
-
Hydrogen Cyanide
- SVI:
-
Seed Vigour Index
- SGR:
-
Seedling Germination Ratio
- PCR:
-
Polymerase Chain Reaction
- UV:
-
Ultraviolet
- DW:
-
Distilled Water
- CMC:
-
Carboxymethyl cellulose
- SD:
-
Standard Deviation
- SE:
-
Standard Error
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Acknowledgements
The authors wish to acknowledge the technical contribution and assistance of Dr. O. R. Molehin of the Department of Biochemistry, Ekiti State University, Ado-Ekiti; Mrs. H. I. Alli of the Veterinary Clinic Laboratory, Equitation Unit of Nigerian Defence Academy, Kaduna; Mr. J. O. Aina of the Laboratory unit of the Department of Biochemistry, Ekiti State University, Ado-Ekiti; Mr. A. O. Olowoyeye of the Central Laboratory of Ekiti State University, Ado-Ekiti; Miss M. Fesobi of the Department of Microbiology, Ekiti State University, Ado-Ekiti; and Mrs. T. O. Fajilade and Mr. T. M. Aladejana of the Laboratory unit of the Department of Laboratory Technology, Federal Polytechnic, Ado-Ekiti, all in Ekiti State, Nigeria.
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AAA, IAA and NEE conceptualized the research; AAA, TOCF, OMA and NEE design the work; AAA; TOCF, OMA acquired and analysed data relating to isolation, identification and invitro screening; AAA, and TOCF acquired and analysed all molecular data; AAA, TOCF, OMA and NEE interpreted all data; AAA wrote the first manuscript; AAA, TOCF, OMA, IAA and NEE revised the manuscript critically; and AAA, TOCF, OMA, IAA and NEE approved the final manuscript for submission.
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Adebayo, A.A., Faleye, T.O.C., Adeosun, O.M. et al. Plant growth promoting potentials of novel phosphate-solubilizing bacteria isolated from rumen content of White Fulani cattle, indigenous to Nigeria. Biologia 78, 201–215 (2023). https://doi.org/10.1007/s11756-022-01227-z
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DOI: https://doi.org/10.1007/s11756-022-01227-z