An Isolated Arthrobacter sp. Enhances Rice (Oryza sativa L.) Plant Growth

Abstract

Rice is a symbol of life and a representation of prosperity in South Korea. However, studies on the diversity of the bacterial communities in the rhizosphere of rice plants are limited. In this study, four bundles of root samples were collected from the same rice field located in Goyang, South Korea. These were systematically analyzed to discover the diversity of culturable bacterial communities through culture-dependent methods. A total of 504 culturable bacteria were isolated and evaluated for their plant growth-promoting abilities in vitro. Among them, Arthrobacter sp. GN70 was selected for inoculation into the rice plants under laboratory and greenhouse conditions. The results showed a significantly positive effect on shoot length, root length, fresh plant weight, and dry plant weight. Moreover, scanning electron microscopic (SEM) images demonstrated the accumulation of bacterial biofilm networks at the junction of the primary roots, confirming the root-colonizing ability of the bacterium. The strain also exhibited a broad spectrum of in vitro antimicrobial activities against bacteria and fungi. Here, we first report the rice plant growth-promoting ability of the Arthrobacter species with the biofilm-producing and antimicrobial activities against plant and human pathogens. Genome analyses revealed features attributable to enhance rice plant growth, including the genes involved in the synthesis of plant hormones, biofilm production, and secondary metabolites. This study revealed that the rhizobacteria isolated from the roots of rice plants have dual potential to be utilized as a plant growth promoter and antimicrobial agent.

Priestia Endophytica Bacteria Stimulate Rhodiola rosea L. in vitro Growth

“…Park et al (2017) demonstrated that adding IAA exhibited the highest levels of shoot and root and the fresh weight of common buckwheat plants. IAA also affected increasing the size of xylem cells (Uggla et al, 1996) and stimulated plant growth (Chhetri et al, 2022). This hormone demonstrated the properties of signaling molecules in plant-microbe interactions, taking part in the symbiosis between microorganisms and host plants (Spaepen et al, 2007;Malhotra and Srivastava, 2009;Duca et al, 1014).…”

Paraburkholderia tagetis sp. nov., a novel species isolated from roots of Tagetes patula enhances the growth and yield of Solanum lycopersicum L. (tomato)

“…A thorough genomic analysis of strain RG36 T revealed the presence of genes that have been involved in promoting plant growth. A diverse group of PGP bacteria is able to reduce plant ethylene levels by the action of 1-aminocyclopropane-1-carboxylate (ACC) deaminase ( Chhetri et al, 2022a ). Genome annotation of strain RG36 T revealed a gene cluster for ACC, a coding enzyme, which can degrade the ethylene precursor ACC, and decrease the ethylene levels in plants.…”

Synergistic effects of substrate inoculation with Pseudomonas strains on tomato phenology, yield, and selected human health‐related phytochemical compounds

“…Reduced microbial diversity affects soil function. Microbes are vital to plant growth like water and sunlight because they provide mineral nutrients, cycling, and nutrients from the biological system (Chhetri et al., 2022); (Koskey et al., 2021). Low nitrogen, phosphorus, and potassium in natural or artificial mediums (soil or soilless) affect plant growth, productivity, and quality (Issifu et al., 2022a).…”

“…Comparing the growth metrics of bacteria‐treated, NPK‐treated, and untreated plants, rhizobacteria‐treated plants significantly increased major growth parameters. Several studies have reported that inoculating plants with beneficial microorganisms increases growth over uninoculated control plants (Chhetri et al., 2022; Cochard et al., 2022; Devi et al., 2022; Jiang et al., 2022).…”