Alleviation of salt stress by halotolerant and halophilic plant growth-promoting bacteria in wheat ( Triticum aestivum )

Abstract

In the current study, 18 halotolerant and halophilic bacteria have been investigated for their plant growth promoting abilities in vitro and in a hydroponic culture. The bacterial strains have been investigated for ammonia, indole-3-acetic acid and 1-aminocyclopropane-1-carboxylate-deaminase production, phosphate solubilisation and nitrogen fixation activities. Of the tested bacteria, eight were inoculated with Triticum aestivum in a hydroponic culture. The investigated bacterial strains were found to have different plant-growth promoting activities in vitro. Under salt stress (200 mM NaCl), the investigated bacterial strains significantly increased the root and shoot length and total fresh weight of the plants. The growth rates of the plants inoculated with bacterial strains ranged from 62.2% to 78.1%.Identifying of novel halophilic and halotolerant bacteria that promote plant growth can be used as alternatives for salt sensitive plants. Extensive research has been conducted on several halophilic and halotolerant bacterial strains to investigate their plant growth promoting activities. However, to the best of my knowledge, this is the first study to inoculate these bacterial strains with wheat.

Halotolerant Bacterial Diversity Associated with Suaeda fruticosa (L.) Forssk. Improved Growth of Maize under Salinity Stress

“…PGPR with ACC-deaminase activity can protect inoculated plants from the deleterious effects of abiotic stressors. Orhan et al [42] reported the salt-stress alleviation of wheat by halotolerant and halophilic PGPR that exhibited ACC-deaminase activity. Halotolerant Klebsiella with ACC-deaminase activity has also been shown to promote the vegetative growth parameters and chlorophyll content of plants under salt stress [43].…”

Efficient rhizobacteria promote growth and alleviate NaCl-induced stress in the plant species Sulla carnosa

“…Recently, a new ecological approach was carried out for improving soil fertility and alleviating effects of salinity on crop growth by using microbial inoculants such as myccorhiza and plant growth promoting rhizobacteria (PGPR) (Dimkpa et al, 2009;Etesami and Beattie, 2018;Saghafi et al, 2018). Efficient microbial inoculants can significantly alleviate salinity induced phytotoxic effects and improve plant growth (Orhan, 2016). Previous studies report the beneficial effects of the halotolerant bacteria isolated from saline ecosystems on the alleviation of salt toxicity effects in crop growth.…”

Potential of hexavalent chromium-resistant rhizosphere bacteria in promoting plant growth and hexavalent chromium reduction

“…Plant growth-promoting activities: The following PGP abilities were determined as previously described by Orhan (2016) and Khan et al (2017).…”

“…Plant growthpromoting rhizobacteria (PGPR) have recently attracted considerable attention because of their ability to enhance plant growth, protection against pathogen infection and reduce the effects of toxic stresses, leading to increased biomass of plants (Son et al, 2014;Rozainyet al, 2017). PGPR produce PGP substances, such as indole-3-acetic acid (IAA) and ammonia and solubilize phosphate to promote plant growth and improve total metal uptake (Orhan, 2016).…”