Influence of physicochemical and nutritional factors on bacterial diversity in mangrove sediments along the southwest coast of Tamilnadu, India

Abstract

The present study was undertaken to investigate the diversity of mangrove-associated bacterial genera at Manakudy estuary, Southwest coast of India. The root and rhizosphere sediments of both mangrove and their associated plants were collected from chosen area. Results inferred that the maximum nutrients, THB density, and diversity indices were recorded in rhizosphere and root sample of Avicennia officinalis. Altogether, 258 bacterial strains were isolated from the chosen mangrove samples and screened for nitrogen fixing and phosphate solubilizing ability. Screened result inferred that, 36.43 % isolates had nitrogen fixing and 29.45 % isolates had phosphate solubilizing ability. Here, the genus Bacillus spp. (21.71 %) was the most dominant genera. The bacterial diversity indices, i.e., univariate analysis showed remarkable variation between the chosen samples; however, maximum diversity indices was registered by rhizosphere and root sample of A. officinalis. The 95 % confidence interval and ellipse showed that samples were well mendacious within AvTD and VarTD. Likewise, the multivariate analysis like similarity percentage was good discriminator from 16.64 to 100 % by Bray-Curtis dissimilarity. The prinicipal component analysis (PCA) showed marked variation between the tested bacterial communities. Cluster analysis and non-metric multi-dimensional scaling (MDS) were grouped by Bray-Curtis similarity index which strongly evidence that the rhizosphere and root samples of A. officinalis were highly diversified in the study area.

Diverse Profiles of AI-1 Type Quorum Sensing Molecules in Cultivable Bacteria from the Mangrove (Kandelia obovata) Rhizosphere Environment

“…Rhizospheric bacteria are living in the direct vicinity of the roots, and root-associated bacteria play important roles in mangrove ecosystem involving nitrogen fixation (Alfaro-Espinoza and Ullrich, 2015), nutrient acquisition (Holguin et al, 2001; Berendsen et al, 2012; Prakash et al, 2015), abiotic stress tolerance (Rout and Southworth, 2013), as well as production of regulators of plant growth and development such as auxins, cytokinins, and gibberellins (Kaai et al, 2008). Additionally, the microbial communities associated with root also play an essential role in the matter cycle (for instance phosphorus, organic acids, and siderophores) and maintenance of the health of wetland ecosystem (Gomes et al, 2011; Zeng et al, 2014).…”

Brazilian Semi-Arid Mangroves-Associated Microbiome as Pools of Richness and Complexity in a Changing World

“…However, this knowledge can be helpful to understand how microbes mediate ecosystem functioning and improve mangrove conservation and management ( Tong et al, 2019 ). Several factors have been reported as drivers of the distribution and structure of bacterial communities of mangrove soils, such as the presence or absence of vegetation ( Jiang et al, 2013 ; Gomes et al, 2014 ; Prakash et al, 2015 ; Chen et al, 2016 ; Liu et al, 2017 ), depth ( Taketani et al, 2010 ; Andrade et al, 2012 ; Otero et al, 2014 ; Basak et al, 2016 ; Luis et al, 2019 ), human activities ( Dias et al, 2011 ; Peixoto et al, 2011 ; Fernandes et al, 2014 ; Nogueira et al, 2015 ; Basak et al, 2016 ; Erazo and Bowman, 2021 ), tidal cycles ( Zhang et al, 2018 ), and physicochemical properties ( Mendes et al, 2012 ; Colares and Melo, 2013 ; Mendes and Tsai, 2014 , 2018 ; Chen et al, 2016 ; Zhu et al, 2018 ). However, many of them cover different areas of a certain mangrove or compare pristine versus impacted ecosystems, demonstrating microbial shifts associated with preservation status in a local scale.…”

Novel Anti-Streptococcal Peptide Produced by Mangrove Bacteria Bacillus subtilis

“…Mangrove plants provide shelter for many living things (Ganesh Kumar et al, 2010;Vasanthi et al, 2014;Jha et al, 2013;Balakrishnan et al, 2014Balakrishnan et al, , 2017aChai et al, 2017;PrabaKaran, 2015, 2011a,b). Mangrove-associated bacteria tend to produce an enormous variety of antibacterial compounds for their survival in the highly competing niche (Balakrishnan et al, 2014;Prakash et al, 2015).…”