Abstract
Thirty-seven root-associated Actinomycetes were isolated from the tomato plant for plant growth promoting activity. Among these, ten were selected for phosphate solubilisation, the production of siderophores, and indole acetic acid. Out of ten, eight Actinomycetes solubilised phosphate, whereas, Streptomyces sp. Al-Dhabi 30 showed better activity (43.1 mg/dL). Actinomycetes produced siderophore and the concentration ranged between 1.6 and 42.1 μg/mL. Streptomyces sp. Al-Dhabi 30 showed the ability to produce a maximum amount of indole acetic acid (IAA) (43 μg/mL), chitinase (43.1 U/mL), cellulase (67 U/mL), and protease (121 U/mL) than other strains. Further, vegetable waste was used as the bulk material for composting using Streptomyces sp. Al-Dhabi 30 along with microbial consortium. Total nitrogen content was 3.8% in Streptomyces sp. Al-Dhabi 30 inoculated compost, whereas 2.7% organic nitrogen was detected in the control. In the compost vegetable waste, the C:N ratio was 10.07, whereas it was 17.51 in the control. The vegetable waste composted with Streptomyces sp. Al-Dhabi 30, Lactobacillus plantarum ATCC 33222, and Candidautilis ATCC 9950 showed antagonistic activity and the supplemented compost enhanced shoot, root height, and total weightin tomato plants. These findings clearly suggest the use of Streptomyces sp. Al-Dhabi 30 as a potential biocontrol agent.
Highlights
Biological waste is mainly found in municipal solid waste (MSW) and more than 75% MSW composed of biodegradable substances
An anaerobic digestion process has been effectively utilized in China to manage MSW and China aimed to treat about 30,000 tonnes of waste food/day [3]
The molecular level characterization of the strain by 16S rRNA gene sequence amplification and sequencing confirmed that the strain belonged to the Streptomyces species and the obtained sequence was publicly available in PubMed, with the accession number 16S rDNA sequence deposited in GenBank under the accession number MN709219
Summary
Biological waste is mainly found in municipal solid waste (MSW) and more than 75% MSW composed of biodegradable substances. Many methods have been proposed to dispose of MSW and waste dumping in a disposal yard is a commonly used method This method leads to soil pollution, the emergence of various diseases in cattle, human beings, and plants [2]. Inoculation of biodegradable waste with various beneficial microorganisms, such as bacteria, fungi, and actinomycetes for the synthesis of extracellular enzymes, such as lipase, pectinase, protease, amylase, and cellulase, enhances the organic waste degradation rate [5]. This can be achieved by co-culturing various microorganisms and each organism contributes either way by synthesizing unique enzymes. Analysis of an efficient biodegrading consortium can be performed by antagonistic property, synergistic activity, and concomitant production of various hydrolytic enzymes [6]
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