Root colonization by beneficial rhizobacteria

Abstract

Rhizosphere microbes play critical roles for plant's growth and health. Among them, the beneficial rhizobacteria have the potential to be developed as the biofertilizer or bioinoculants for sustaining the agricultural development. The efficient rhizosphere colonization of these rhizobacteria is a prerequisite for exerting their plant beneficial functions, but the colonizing process and underlying mechanisms have not been thoroughly reviewed, especially for the non-symbiotic beneficial rhizobacteria. This review systematically analyzed the root colonizing process of the non-symbiotic rhizobacteria and compared it with that of the symbiotic and pathogenic bacteria. This review also highlighted the approaches to improve the root colonization efficiency and proposed to study the rhizobacterial colonization from a holistic perspective of the rhizosphere microbiome under more natural conditions.

Deciphering the Structural and Functional Diversity of Rhizobacteria from Stone Pine Inoculated with Plant Growth Promoting Rhizobacteria (PGPR) before and after Transplanted into Degraded Agricultural Soil

“…The ability of plants to select rhizobacteria is determined by the type of exudates they exude from their roots. In addition to sugars, plants exude other selective molecules of different chemical natures to attract those microorganisms that are useful in certain circumstances [33][34][35]. For example, Arabidopsis plants have been shown to exude coumarins to attract microorganisms capable of producing siderophores in situations of iron scarcity [36].…”

Antioxidative Response of Duckweed (Lemna minor L.) to Rhizosphere-Associated Pseudomonas Strains and Exogenous Indole-3-Acetic Acid

“…In addition, under abiotic or biotic stress conditions, including colonization by PGPB, ROS are generated intensively [33], [34]. Although in this case, it is not possible to discriminate between normally produced ROS and ROS produced in response to bacteria, the pattern of ROS localization in roots, nodes, veins and daughter fronds of duckweeds can hypothetically be also attributed to bacterial preference for these anatomical parts, especially roots since they are highly metabolically active [35][36][37]. Superoxide anions were clearly localized in veins, which might be explained, at least in part, by duckweed-bacteria communication [6], the low reactivity of superoxide anions and the lack of superoxide dismutase and ascorbate in this region Reactive oxygen species (ROS) are constantly produced during growth, photosynthesis and cell respiration under normal conditions.…”

Modulation of the endophytic strain Kosakonia radicincitans UYSO10 proteome by sugarcane roots exudate

“…Mobility and chemotaxis. The bacterial transition from a mobile state to bio lm formation requires the expression of transcriptional regulators, which respond to environmental signals such as root exudates (Han et al 2023;Liu et al 2024). In this sense in the presence of root exudates, the strain UYSO10 up-regulated the universal stress protein G, as well as the stringent response regulator DksA and the CheZ protein (Figure 5).…”