Actinobacteria from Rhizosphere

Yadav, Ajar Nath; Verma, Priyanka; Kumar, Sunil; Kumar, Vinod; Kumar, Manish; Sugitha, T.C.K.; Singh, Bhim Pratap; Saxena, Anil Kumar; Dhaliwal, H. S.

doi:10.1016/b978-0-444-63994-3.00002-3

Cited by 115 publications

(33 citation statements)

References 152 publications

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“…Some actinobacteria form symbiotic association residing in plant tissues have generated (Coombs and Franco 2003;Thamchaipenet et al 2010;Chen et al 2011;Xie et al 2011;Yadav 2017;Yadav and Yadav 2018). Reports revealed that the actinomycetes diversity in phyllosphere is high in the tropical and temperate ecosystem (Strobel and Daisy 2003;Yadav et al 2018b;Yadav and Yadav 2019). Moreover, the physiology of the plant and the environment determines the actinobacterial association in plants and allows them to establish endophytic life (Du et al 2013).…”

Section: Actinomycetes Diversity In Phyllospherementioning

confidence: 99%

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Sivakumar

Sathishkumar

Selvakumar

et al. 2020

Sustainable Development and Biodiversity

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The phyllosphere referred to the total aerial plant surfaces (above-ground portions), as habitat for microorganisms. Microorganisms establish compositionally complex communities on the leaf surface. The microbiome of phyllosphere is rich in diversity of bacteria, fungi, actinomycetes, cyanobacteria, and viruses. The diversity, dispersal, and community development on the leaf surface are based on the physiochemistry, environment, and also the immunity of the host plant. A colonization process is an important event where both the microbe and the host plant have been benefited. Microbes commonly established either epiphytic or endophytic mode of life cycle on phyllosphere environment, which helps the host plant and functional communication with the surrounding environment. To the scientific advancement, several molecular techniques like metagenomics and metaproteomics have been used to study and understand the physiology and functional relationship of microbes to the host and its environment. Based on the available information, this chapter describes the basic understanding of microbiome in leaf structure and physiology, microbial interactions, especially bacteria, fungi, and actinomycetes, and their adaptation in the phyllosphere environment. Further, the detailed information related to the importance of the microbiome in phyllosphere to the host plant and their environment has been analyzed. Besides, biopotentials of the phyllosphere microbiome have been reviewed.

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Section: Actinomycetes Diversity In Phyllospherementioning

confidence: 99%

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Sivakumar

Sathishkumar

Selvakumar

et al. 2020

Sustainable Development and Biodiversity

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“…Bacteria generally synthesize two types of siderophores: the catechol type and the hydroxamate type. IAA is an indole derivative that has several functions to enhance plant growth, such as root formation, stimulation of cell division, extension, and differentiation (Hider and Kong 2010;Yadav et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

2020

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Abstract. Aouar L, Boukelloul I, Benadjila A. 2020. Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties. Biodiversitas 21: 5672-5683. To produce new bioactive substances of agricultural interest, extreme ecosystems can be a source of unexplored microorganisms. Accordingly, in this study, twenty-two actinobacteria strains were obtained from rhizospheric arid soils of palm groves collected from Biskra and El Oued in the Algerian Sahara. All isolates were examined for the in vitro antifungal potential towards phytopathogenic fungi: Aspergillus flavus, Verticillium dahlia, Rhizoctonia solani, Botrytis cinerea and Fusarium oxysporum as well as for their antibacterial property toward phytopathogenic bacteria: Streptomyces scabiei, Pectobacterium carotovorum and Agrobacterium tumefaciens. The three isolates (13%) that inhibited at least five pathogens were then selected, identified and assessed for their attributes to produce indole-3-acetic acid (IAA) and siderophores, to solubilize phosphate, and to antagonize Streptomyces scabiei in vivo. According to phylogenetic analysis performed with 16S rDNA sequence, chemotaxonomy and phenotypic characteristics, the strain SO1, which inhibited all tested pathogens, was assigned to Streptomyces flaveus. While, strains SO2 and SB1 were affiliated to Streptomyces enissocaesilis and Streptomyces albidoflavus, respectively. All strains produced IAA but only SO1 and SB1 were able to elaborate siderophores catecholate-type. Two strains SO1 and SO2 exhibited a capacity to solubilize phosphate and SO1 was able to suppress the pathogenic effect of Streptomyces scabiei on radish seedlings. The findings indicate that SO1 strain may reveal the potential for use as a biocontrol agent and plant growth promoter.

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“…Certain rhizosphere Streptomyces species have been reported to produce HCN [68,69]. All strains from the rhizosphere tested in this study were positive for HCN production.…”

Section: Characterisation Of Actinomycete Strainsmentioning

confidence: 58%

The Impact of Growth-Promoting Streptomycetes Isolated from Rhizosphere and Bulk Soil on Oilseed Rape (Brassica napus L.) Growth Parameters

et al. 2021

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Inoculation of Streptomyces to improve oilseed rape (Brassica napus L.) yields and minimise the use of chemical fertilisers is a promising sustainable strategy. In this study, we isolated 72 actinobacterial strains from rhizosphere of oilseed rape and maize and from bulk soil for screening and characterising their antimicrobial activity. Nine promising strains, identified as Streptomyces sp. by morphology, physiological characteristics, and 16S rRNA gene sequencing, were selected for their plant growth-promoting traits and in planta experiments. The actinobacterial strains were positive for IAA production, siderophore production, and HCN production. In planta experiments were conducted by soaking the oilseed rape seeds in the actinobacterial suspension, followed by plant growth under controlled conditions in a cultivate chamber (22–28 °C, 8 h dark/16 h light, constant humidity 80%). We recorded root and shoot length (cm) and seedling fresh weight (g). For most of the abovementioned parameters, a significant enhancement was observed with strain KmiRC20A118 treatment. The length of the root increased by 53.14%, the shoot length increased by 65.6%, and the weight of the fresh plant by 60% compared to the control. The integrated application of PGPS (Plant Growth Promoting Streptomyces) from the rhizosphere of oilseed rape is a promising strategy to improve the growth of oilseed rape.

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Actinobacteria from Rhizosphere

Cited by 115 publications

References 152 publications

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

The Impact of Growth-Promoting Streptomycetes Isolated from Rhizosphere and Bulk Soil on Oilseed Rape (Brassica napus L.) Growth Parameters

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