The Potential Use of Actinomycetes as Microbial Inoculants and Biopesticides in Agriculture

Silva, Guilherme da Cruz; Kitano, Isabella Takahashi; Ribeiro, Iron Amoreli de Figueiredo; Lacava, Paulo Teixeira

doi:10.3389/fsoil.2022.833181

Cited by 35 publications

(9 citation statements)

References 231 publications

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“…The mechanisms for phytostimulants of the genus Streptomyces spp. described in the literature are closely like the mechanisms of action of PGPR and PGPF [35]. This can also explain the same percentage increase in grain yield when using biofertilizers B1 and B4 and a slightly lower percentage when using biofertilizers B2 (Table 3).…”

Section: Results Of Field Researchsupporting

confidence: 65%

Enhancing Spring Barley Grain Yield with Local Biofertilizers in the Semi-Arid Steppe Zone of Northern Kazakhstan

Nauanova,

Shaikhin,

Ospanova

et al. 2024

IJDNE

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Barley is one of the most important grain crops grown in all agricultural regions of the world. It is unique in its chemical composition and health benefits. In Kazakhstan, the largest country in Central Asia, barley is the second most important grain commodity after wheat. The main goal of the project was a comparative study of the effect of four local biofertilizers in the form of consortia of indigenous soil microorganisms with PGPR and PGPF properties on the grain yield of spring barley variety "Tselinny 2005" in the conditions of the Kazakhstan semi-arid steppe zone. Employing a systematic field trial design, each biofertilizer's impact was assessed through its application rates and methods, comparing against control plots without biofertilizer treatment. Grain yield was meticulously measured post-harvest, accounting for variations in environmental conditions, to ascertain the biofertilizers' contributions to crop productivity. Based on the results obtained, recommend the most effective biofertilizers to barley producers. Laboratory tests of germination energy, germination of spring barley seeds inoculated with biofertilizers, and post-embryonic development of roots and shoots showed the effective colonization potential of at least three tested biofertilizers. Single-factor field experiments over two years showed that the significant benefits of employing biofertilizers B1 and B4, which not only promote a 50% increase in spring barley grain yield but also present a sustainable and environmentally beneficial alternative to synthetic fertilizers, pesticides, and fungicides to increase barley grain yield in areas subject to abiotic and biotic stress. Utilizing these biofertilizers could reduce environmental impact, and lower production costs, offering a holistic approach to enhancing agricultural productivity in semi-arid regions.

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Section: Results Of Field Researchsupporting

confidence: 65%

Enhancing Spring Barley Grain Yield with Local Biofertilizers in the Semi-Arid Steppe Zone of Northern Kazakhstan

Nauanova,

Shaikhin,

Ospanova

et al. 2024

IJDNE

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“…Desert soils worldwide possess a huge diversity of microorganisms dominated by Actinobacteria (36.8%), Proteobacteria (23.8%), Firmicutes (8.6%), and Acidobacteria (5.5%) ( Dean et al, 2020 ). According to this microbial diversity distribution and the well-known potential of Actinobacteria as control agents ( Bhatti et al, 2017 ; Cruz Silva et al, 2022 ); ISP2 medium was employed in the first screening, looking for isolates belonging to this phylum or to Firmicutes ( Tian et al, 2022 ). Since, although ISP2 is considered as a selective medium for actinomycetes, it allows the growth of some other bacterial genera, such as Bacillu s, too ( Paz et al, 2016 ; Zhou et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Native Bacillus paralicheniformis isolate as a potential agent for phytopathogenic nematodes control

Chavarria-Quicaño,

Contreras-Jácquez,

Carrillo-Fasio

et al. 2023

Front. Microbiol.

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Phytopathogenic nematodes (PPNs) are responsible for substantial damages within agricultural crops worldwide which can be controlled employing beneficial microorganisms and/or their metabolites in an ecofriendly way. Nevertheless, the success of the control regards not only on the virulence of the strains or the toxicity of their metabolites but also on their ability to colonize and remain in the rhizospheric environment, particularly in those crops affected by abiotic stresses promoted by the climate change. Consequently, the bioprospection of beneficial microorganisms able to control PPNs and to thrive in adverse conditions has attracted attention. On this way, deserts are perfect ecological niches to isolate microorganisms adapted to harsh enviroments. The purpose of this research was to isolate and characterize bacteria from rhizospheric soil samples collected in the Northwestern Desert of Mexico with potential for PPNs control. As first screening, secretomes of each isolate were tested in vitro for nematicidal activity (NA). Then, activities from secretomes and endospores from the selected isolate were confirmed in vivo assays. From 100 thermotolerant isolates, the secretome of the isolate identified as Bacillus paralicheniformis TB197 showed the highest NA (>95%) against Meloidogyne incognita, both in vitro and in vivo tests, suppressing infections caused by M. enterolobii in tomato crops, too. In open field tests, the endospores of TB197 strain showed a reduction of 81% in the infection severity caused by M. enterolobii (p ≤ 0.05), while the galling index (GI) was reduced 84% (p ≤ 0.05) in tomato greenhouse-tests. Also, a reduction of the root necrosis (81%) caused by Radopholus similis in banana plantations (p ≤ 0.05), compared to the control was observed. Owing to their efficacy in controlling PPNs infections, the endospores and secondary metabolites of B. paralicheniformis TB197 strain could be used in bionematicidal formulations.

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“…Actinomycetes are prokaryotes, meaning they lack a true cell nucleus, unlike fungi which are eukaryotes with a defined nucleus. These structural and genetic differences emphasize that the resemblance between Actinomycetes and fungi is more a result of convergent evolution, where genetically unrelated organisms develop similar physical traits as adaptations to similar environmental conditions [20,21].…”

Section: Actinomycetes Isolatesmentioning

confidence: 99%

ENCAPSULATION OF SOYBEAN SEEDS WITH Actinomycetes AS A BIOCONTROL AGENT AGAINST Sclerotium rolfsii Sacc

Masnilah,

Anam,

Pradana

2024

JPEN

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This study evaluates the effectiveness of Actinomycetes in encapsulating soybean seeds to control damping-off disease caused by Sclerotium rolfsii. With national soybean demand reaching 22 million tons per year and domestic production only 1 million tons, increasing production is essential. One major constraint is the attack of plant pathogens such as S. rolfsii, which can cause significant losses. Actinomycetes were isolated from the rhizosphere of weeds and tested for their antagonistic activity in vitro. Seed encapsulation using various carriers (kaolin, talc, and zeolite) was conducted to determine the most effective formula. In vivo tests showed that the Actinomycetes isolate PM2 exhibited the best antagonistic activity, with the zeolite formulation reducing pre-emergence damping-off disease incidence to 12.50% and post-emergence damping-off to 8.25%, compared to the positive control. These results indicate that the use of Actinomycetes in soybean seed encapsulation is an effective and sustainable method for controlling damping-off disease. Zeolite as a carrier proved to provide a supportive environment for antagonistic microbes, maintaining moisture and supplying necessary nutrients. This research reveals the great potential of Actinomycetes as a biocontrol agent in plant disease management strategies, which can significantly enhance soybean production and support national food security.

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The Potential Use of Actinomycetes as Microbial Inoculants and Biopesticides in Agriculture

Cited by 35 publications

References 231 publications

Enhancing Spring Barley Grain Yield with Local Biofertilizers in the Semi-Arid Steppe Zone of Northern Kazakhstan

Enhancing Spring Barley Grain Yield with Local Biofertilizers in the Semi-Arid Steppe Zone of Northern Kazakhstan

Native Bacillus paralicheniformis isolate as a potential agent for phytopathogenic nematodes control

ENCAPSULATION OF SOYBEAN SEEDS WITH Actinomycetes AS A BIOCONTROL AGENT AGAINST Sclerotium rolfsii Sacc

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