Diversity and Plant Growth-Promoting Ability of Endophytic, Halotolerant Bacteria Associated with Tetragonia tetragonioides (Pall.) Kuntze

Abstract

The diversity of salt-tolerant cultivable endophytic bacteria associated with the halophyte New Zealand spinach (Tetragonia tetragonioides (Pall.) Kuntze) was studied, and their plant beneficial properties were evaluated. The bacteria isolated from leaves and roots belonged to Agrobacterium, Stenotrophomonas, Bacillus, Brevibacterium, Pseudomonas, Streptomyces, Pseudarthrobacter, Raoultella, Curtobacterium, and Pantoea. Isolates exhibited plant growth-promoting traits, including the production of a phytohormone (indole 3-acetic-acid), cell wall degrading enzymes, and hydrogen cyanide production. Furthermore, antifungal activity against the plant pathogenic fungi Fusarium solani, F. oxysporum, and Verticillium dahliae was detected. Ten out of twenty bacterial isolates were able to synthesize ACC deaminase, which plays a vital role in decreasing ethylene levels in plants. Regardless of the origin of isolated bacteria, root or leaf tissue, they stimulated plant root and shoot growth under 200 mM NaCl conditions. Our study suggests that halophytes such as New Zealand spinach are a promising source for isolating halotolerant plant-beneficial bacteria, which can be considered as potentially efficient biofertilizers in the bioremediation of salt-affected soils.

Salt-tolerant PGPR strain Priestia endophytica SK1 promotes fenugreek growth under salt stress by inducing nitrogen assimilation and secondary metabolites

“…Inoculation of fenugreek plants with P. endophytica SK1 enhanced P content in both control and salt-stressed plants. Similar observations of increase in P uptake in plants through co-inoculation with phosphate-solubilizing bacteria has been reported earlier (Egamberdieva et al, 2022;Kumar et al, 2020;Shurigin et al, 2022). P. endophytica SK1, in the present study, was able to solubilize phosphate enabling more P uptake in fenugreek plant under salt stress.…”

A Plant Endophytic Bacterium Priestia megaterium StrainBP-R2 Isolated from the Halophyte Bolboschoenus planiculmis Enhances Plant Growth under Salt and Drought Stresses

“…When plants grow in severe salinity and drought environments, the presence of endophytic bacteria in these plants may help them to survive and grow in these conditions. Several studies have shown the beneficial effects of endophytic bacteria on their host plants, such as the Salicornia brachiate [ 21 ] plant, Cicer arietinum [ 22 ], Haloxylon ammodendron [ 23 ], Nypa fruticans [ 24 ], Salicornia bigelovii [ 25 ], Armoracia rusticana [ 26 ], Seidlitzia rosmarinus [ 27 ], Calendula officinalis [ 28 ], Halocnemum strobilaceum [ 29 ], Haloxylon aphyllum [ 30 ], Tetragonia tetragonioides [ 31 ], and other plants. In this study, we have isolated an endophytic bacterium from the salt marsh halophyte, Bolboschoenus planiculmis .…”

Effect of endophytic bacterium, Stenotrophomonas maltophilia JVB5 on sunflowers

“…Like other identified Stenotrophomonas species, S. maltophilia is a Gram-negative, rod-like, spore former, and facultative anaerobe, that is commonly found in a plant-soil environment. Recent findings on some agriculturally important Stenotrophomonas species are evident in literature, which suggests their future exploration as a suitable candidate in the formulation of bioinoculants to provide for a stable ecosystem, provide biosafety, and create sustainable agriculture (Alexander et al 2019;Ulrich et al 2021;Egamberdieva et al 2022).…”