Sphingomonas sediminicola Dae20 Is a Highly Promising Beneficial Bacteria for Crop Biostimulation Due to Its Positive Effects on Plant Growth and Development

Abstract

Current agricultural practices rely heavily on synthetic fertilizers, which not only consume a lot of energy but also disrupt the ecological balance. The overuse of synthetic fertilizers has led to soil degradation. In a more sustainable approach, alternative methods based on biological interactions, such as plant growth-promoting bacteria (PGPRs), are being explored. PGPRs, which include both symbiotic and free-living bacteria, form mutualistic relationships with plants by enhancing nutrient availability, producing growth regulators, and regulating stress responses. This study investigated the potential of Sphingomonas sediminicola Dae20, an α-Proteobacteria species commonly found in the rhizosphere, as a beneficial PGPR. We observed that S. sediminicola Dae20 stimulated the root system and growth of three different plant species in the Brassicaceae family, including Arabidopsis thaliana, mustard, and rapeseed. The bacterium produced auxin, nitric oxide, siderophores and showed ACC deaminase activity. In addition to activating an auxin response in the plant, S. sediminicola Dae20 exhibited the ability to modulate other plant hormones, such as abscisic acid, jasmonic acid and salicylic acid, which are critical for plant development and defense responses. This study highlights the multifunctional properties of S. sediminicola Dae20 as a promising PGPR and underscores the importance of identifying effective and versatile beneficial bacteria to improve plant nutrition and promote sustainable agricultural practices.

Traditional potato tillage systems in the Peruvian Andes impact bacterial diversity, evenness, community composition, and functions in soil microbiomes

“…Another prominent member of our core microbiome is Sphingomonas , a genus also detected in fields with a low disease incidence 50 . Sphingomonas plays a dual role by promoting plant growth and enhancing plant resistance to pathogens 51 .…”

Microbial fungicides can positively affect aubergine photosynthetic properties, soil enzyme activity and microbial community structure

“…At the genus level, the use of microbial agents promotes Bacillus , Paenisporosarcina , the unnamed taxonomic genera of the order Actinomarinales , the unnamed taxonomic genera of the family Geminicoccaceae and the unnamed taxonomic genera of the order Alphaproteobacteria , the relative abundance of unnamed genera of the order Bacteriap 25 decreased and the relative abundance of unnamed genera of the family A4b and unnamed genera of the order Vicinamibacterales , Sphingomonas , and other genera increased. Members of the genus Sphingomonas have been reported to have a variety of ecological functions, such as the degradation of complex organic matter, antagonism of phytopathogenic fungi, as well as the secretion of extracellular polysaccharides, and the promotion of plant uptake ( Mazoyon et al, 2023 ). The increase in the number of important beneficial functional bacterial taxa in the bacterial community seen in the inter-root soil after bacterial treatment allows the timely decomposition of proteins and other substances in the soil, improving the quality of the soil, providing crops with required nutrients, promoting crop growth, and reducing the incidence of soil diseases ( Qi et al, 2021a ; Qi et al, 2021b ).…”