Plant Growth Promoting and Biocontrol Activity of Streptomyces spp. as Endophytes

Abstract

There has been many recent studies on the use of microbial antagonists to control diseases incited by soilborne and airborne plant pathogenic bacteria and fungi, in an attempt to replace existing methods of chemical control and avoid extensive use of fungicides, which often lead to resistance in plant pathogens. In agriculture, plant growth-promoting and biocontrol microorganisms have emerged as safe alternatives to chemical pesticides. Streptomyces spp. and their metabolites may have great potential as excellent agents for controlling various fungal and bacterial phytopathogens. Streptomycetes belong to the rhizosoil microbial communities and are efficient colonizers of plant tissues, from roots to the aerial parts. They are active producers of antibiotics and volatile organic compounds, both in soil and in planta, and this feature is helpful for identifying active antagonists of plant pathogens and can be used in several cropping systems as biocontrol agents. Additionally, their ability to promote plant growth has been demonstrated in a number of crops, thus inspiring the wide application of streptomycetes as biofertilizers to increase plant productivity. The present review highlights Streptomyces spp.-mediated functional traits, such as enhancement of plant growth and biocontrol of phytopathogens.

Plant growth promotion and chilli anthracnose disease suppression ability of rhizosphere soil actinobacteria

“…The use of biofertilizers, biopesticides, or consortiums of plant beneficial microbes in correct formulations provides a potential solution for a more sustainable agricultural future (Vurukonda et al . ). A comparatively better performance in fungicide treatment when compared to controls might be because of relieving the plants from pathogen related stress.…”

“…The extent of zone formation reflected the inhibition ability of actinobacteria upon the spore germination and mycelia formation of fungal pathogen C. capsici. Actinobacteria belonging to the genus Streptomyces could produce many important secondary metabolites which could be exploited to enhance plant growth directly or by inhibiting diseases (Franco-Correa et al 2010;Bhattacharyya and Jha 2012;Vurukonda et al 2018).…”

“…The poor plant performance in broth dilution of 10 À3 , indicate that the bioactive compounds are required at a needed concentration to bring about the antagonist property or vigour to control disease or to promote plant growth in chilli plants. The use of biofertilizers, biopesticides, or consortiums of plant beneficial microbes in correct formulations provides a potential solution for a more sustainable agricultural future (Vurukonda et al 2018). A comparatively better performance in fungicide treatment when compared to controls might be because of relieving the plants from pathogen related stress.…”

Microbiota Characterization of Agricultural Green Waste-Based Suppressive Composts Using Omics and Classic Approaches

“…Actinobacteria are widely studied for their applicability in biocontrol [42,43]. In L5/6A compost Nocardiopsis, a genus belonging to the Actinobacteria phylum, was significantly more abundant than in L2A (1.17% in L5/6A compost and 3.8 Log 2 FC).…”

Streptomyces as a Source of Antimicrobials: Novel Approaches to Activate Cryptic Secondary Metabolite Pathways

“…One of the first discovered is its relationship with plant roots providing a natural defense against fungal infections [61]; it is very common to find bacteria of the Streptomyces genus in the rhizosphere. This fact raises the possibility, currently discussed, about its use as biofertilizers in crops [62,63]. Furthermore, genome mining is now allowing us to know on one hand which genes are involved in this interaction and on the other hand the discovery of potential novel molecules produced only in these conditions [64].…”